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Effects of microstructure characteristics on the tensile properties and fracture toughness of TA15 alloy fabricated by hot isostatic pressing

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International Journal of Minerals,Metallurgy and Materials 2023年第4期30卷 697-706页

作者： Langping Zhu Yu Pan Yanjun Liu Zhiyu Sun Xiangning Wang Hai Nan Muhammad-Arif Mughal Dong Lu Xin Lu Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Engineering TechnologyUniversity of Science and Technology BeijingBeijing 100083China AECC Beijing Institute of Aeronautical Materials Beijing 100095China Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology Beijing 100095China Institute of Artificial Intelligence University of Science and Technology BeijingBeijing 100083China Sichuan Advanced Metal Material Additive Manufacturing Engineering Technology Research Center Chengdu Advanced Metal Materials Industry Technology Research Institute Co.LtdChengdu 610300China

Powder hot isostatic pressing(HIP) is an effective method to achieve near-net-shape manufacturing of high-quality complex thinwalled titanium alloy parts, and it has received extensive attention in recent years. However, there are few reports about the microstructure characteristics on the strengthening and toughening mechanisms of powder hot isostatic pressed(HIPed) titanium alloys. Therefore, TA15powder was prepared into alloy by HIP approach, which was used to explore the microstructure characteristics at different HIP temperatures and the corresponding tensile properties and fracture toughness. Results show that the fabricated alloy has a “basket-like structure” when the HIP temperature is below 950℃, consisting of lath clusters and surrounding small equiaxed grains belts. When the HIP temperature is higher than 950℃, the microstructure gradually transforms into the Widmanstatten structure, accompanied by a significant increase in grain size. The tensile strength and elongation are reduced from 948 MPa and 17.3% for the 910℃ specimen to 861 MPa and 10% for the 970℃ *** corresponding tensile fracture mode changes from transcrystalline plastic fracture to mixed fracture including intercrystalline *** fracture toughness of the specimens increases from 82.64 MPa·m^(1/2)for the 910℃ specimen to 140.18 MPa·m^(1/2)for the 970℃ *** below 950℃ tend to form holes due to the prior particle boundaries(PPBs), which is not conducive to toughening. Specimens above 950℃ have high fracture toughness due to the crack deflection, crack branching, and shear plastic deformation of the Widmanstatten structure. This study provides a valid reference for the development of powder HIPed titanium alloy.

关键词： powder titanium alloy hot isostatic pressing strength fracture toughness

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Effects of heat treatments on microstructures of TiAl alloys

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International Journal of Minerals,Metallurgy and Materials 2022年第6期29卷 1225-1230页

作者： Wen Yu Jianxin Zhou Yajun Yin Zhixin Tu Xin Feng Hai Nan Junpin Lin Xianfei Ding State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and TechnologyWuhan 430074China Cast Titanium Alloy R&D Center Beijing Institute of Aeronautical MaterialsBeijing 100095China Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology Beijing 100095China Beijing Institute of Aeronautical Materials Co. Ltd.Beijing 100094China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This study aims to investigate the effects of heat treatments on the microstructure ofγ-TiAl *** Ti-47Al-2Cr-2Nb alloy ingots were manufactured by casting method and then heat-treated in two types of heat *** microstructures were studied by both optical and scanning electron *** chemical compositions of two ingots were determined as *** ingot with lower Al content only obtains lamellar structures while the one higher in Al content obtains nearly lamellar and duplex structures after heat treatment within1270 to 1185℃.A small amount of B2 phase is found to be precipitated in both as-cast and heat-treated *** are distributed at grain boundaries when holding at a higher temperature,such as 1260℃.However,B2 phase is precipitated at grain boundaries and in colony interiors simultaneously after heat treatments happened at 1185℃.Furthermore,the effects of heat treatments on grain refinement and other microstructural parameters are discussed.

关键词： TiAl alloys microstructure heat treatment casting

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Elemental decoration design with metastable cellular substructures for additively manufactured high-strength and high-corrosion resistant austenitic stainless steel

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Corrosion Communications 2024年第1期13卷 17-26页

作者： Decheng Kong Xin He Kunjie Dai Xiaoqing Ni Liang Zhang Li Wang Chaofang Dong Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and Technology University of Science and Technology Beijing Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Research and Application Center of Additive Manufacturing Materials Shanghai Research Institute of Materials Co.Ltd.

Multi-level chemical-structural heterogeneities extensively exist in additively manufactured(AM) metals due to the intrinsic layer-by-layer non-equilibrium solidification process. Strategies designed with particular metastable substructures aiming at advanced performances are significant for AM counterparts. In this work, Si and Mo additions are conducted based on the regulations of dislocation cell substructures and stacking fault energies for stainless steel(SS) 316L fabricated by laser powder bed fusion(PBF-LB). Their load-bearing performance and corrosion behavior are characterized. Results show that additional Mo segregation at cellular boundaries contributes a stronger strengthening effect than Si, which periodically hinders dislocation slip during deformation. Addition of Si triggers deformation twinning at an early stage due to decreased stacking fault energy, and subsequent dynamic Hall-Petch effects improve strain-hardening capability and plasticity for PBF-LB SS 316L + Si. Meanwhile, addition of Mo enhances pitting corrosion resistance of PBF-LB 316L + Mo SS in chloride-containing solutions, especially the pitting re-passivation, which is opposite in the Si addition case due to the increased quantiy of undesired Si/Mn-rich oxides. Underlying deformation and corrosion mechanisms for Mo/Si-added PBF-LB SSs are discussed. Our work is anticipated to motivate the alloy design concept based on particular metastable substructures for advanced AM alloys.

关键词： Dislocation cell Elemental segregation Laser powder bed fusion Austenitic stainless steel alloy design Corrosion resistance

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Recrystallization effect on surface passivation of Hastelloy X alloy fabricated by laser powder bed fusion

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Journal of Materials Science & technology 2023年第32期163卷 245-258页

作者： Xing He Li Wang Decheng Kong Ruixue Li Wei Zhang Kunjie Dai Xiaoqing Ni Ketai He Chaofang Dong Beijing Advanced Innovation Center for Materials Genome Engineering Key Laboratory for Corrosion and Protection(MOE)Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Engineering Research Center of 3D Printing Materials Shanghai Research Institute of MaterialsShanghai 200437China School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China

Post-heat treatment is generally adopted in the additive manufacturing field due to its alleviation of high residual stress and modification of rapid-solidified multilevel heterogeneous microstructure,and the related performance of the heat-treated counterparts calls for a systemic investigation to build a criterion of the heat treatment *** this work,we focus on the heat treatment effects on the recrystallization of the Hastelloy X alloy produced by the laser powder bed fusion(LPBF)method,and the related surface passivation of the heat-treated counterparts is meticulously assessed as *** show that the multilevel heterostructure for LPBF Hastelloy X alloy consists of sub-micro dislocation cell substructures with Cr/Mo elemental segregation,fine columnar grains,and periodically-distributed molten *** heat treatment,partially and fully recrystallized structures for LPBF Hastelloy X alloys were achieved at 1100 and 1200℃for 1 h,***,the as-built LPBF Hastelloy X alloy shows superior corrosion resistance while the heat-treated one(1100℃)exhibits the worst in the borate buffer *** growth of passive film exhibited a highly linear correlation with the nucleation process controlled by diffusion,and high dislocation density and low angle grain boundary decreased the diffusion coefficient of cation vacancies,augmenting the nucleation sites of the passive film and enhancing its growth ***,the micro-galvanic effect resulting from the partially recrystallized microstructure actively facilitated the formation of inhomogeneous porous passive films,leading to the worst corrosion resistance.

关键词： Laser powder bed fusion Hastelloy X Recrystallization Heterogeneous microstructure Passive film

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Heat treatment effects on the metastable microstructure,mechanical property and corrosion behavior of Al-added CoCrFeMnNi alloys fabricated by laser powder bed fusion

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Journal of Materials Science & technology 2023年第7期138卷 171-182页

作者： Decheng Kong Li Wang Guoliang Zhu Yiqi Zhou Xiaoqing Ni Jia Song Liang Zhang Wenheng Wu Wei Wu Cheng Man Da Shu Baode Sun Chaofang Dong Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Shanghai Engineering Research Center of 3D Printing Materials Shanghai Research Institute of MaterialsShanghai 200437China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China

With the development of aerospace and transportation,high-strength structural materials manufactured by additive manufacturing techniques get more attention,which allows the production of counterparts with complex *** work investigates Al-added CoCrFeMnNi high-entropy alloys(Al-HEAs)pre-pared by laser powder bed fusion(PBF-LB),adding 4.4 wt.%Al reducing approximately 7%*** contribution of post-heat-treatment to microstructure,mechanical properties,and corrosion behaviors are *** cracking along with grain boundaries in the as-built PBF-LB Al-HEAs is determined,which comes from the residual liquid film as a larger solidification temperature range by adding *** PBF-LB Al-HEAs mainly consist of a face-centered cubic(FCC)matrix with Al/Ni/Mn decorated dislocation cells therein and a minor body-centered cubic(BCC)*** 850℃ annealing treatment,massive BCC phases(ordered NiAl and disordered Cr-rich precipitates)generate at the dislocation cell/grain bound-aries and the dislocation cells are still ***,the volume fraction of BCC phases and the dislocation cells vanish after 1150℃ solution *** a result,Al-HEA850 shows an over 1000 MPa yield strength with nearly no ductility(<3%);the Al-HEA1150 exhibits considerable strength-ductility ***,the Al-HEA850 demonstrates the worst pitting corrosion resistance due to the preferential dissolution of the NiAl precipitates in chloride-containing *** comparatively de-liberating the evolution of strength-ductility and localized corrosion,we built a framework about the effects of the heat treatment on the mechanical property and degradation behavior in additively manu-factured Al-added high-strength HEAs.

关键词： High entropy alloy Laser powder bed fusion Heat treatment Dislocation cell Mechanical property Corrosion behavior

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Comparative study of surface contaminated layer on titanium aluminum alloy and titanium alloy investment castings 21st

Comparative study of surface contaminated layer on titanium ...

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21st Chinese Materials Conference, CMC 2020

作者： Feng, Zhihua Ding, Xianfei Feng, Xin Nan, Hai Zhang, Aibin Beijing Baimtec Material Co. Ltd. Beijing100094 China Cast Titanium Alloy R&D Center AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology Beijing100094 China

ISBN: (纸本)9783035717389

A comparative study of the surface contaminated layer formed by chemical reaction between ceramic-mold and titanium aluminum alloy castings or titanium alloy castings were carried out. The morphology, thickness and hardness of the surface contaminated layer were characterized by means of metalloscopy and microhardness measurement. The results show that surface contaminated layers formed between Ti-Al alloy castings and ceramic-mold, also formed between Ti alloy castings and ceramic-mold. The surface contaminated layers of Ti-Al alloy castings were continuous and compact, their thickness was about 0~90 μm. The surface contaminated layers of titanium alloy castings were not even, their thickness was 0~900 μm. titanium alloy is more liable to react with the ceramic-mold than the Ti-Al alloy. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： titanium alloys

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Chemical composition analysis on industrial scale ingots and castings of TiAl alloys

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China Foundry 2020年第6期17卷 441-446页

作者： Xian-fei Ding Yi-qun Zhao Jia-bin Zuo Xin Feng Hai Nan Yong-feng Liang Yan-qing Su Cast Titanium Alloy R&D Center Beijing Institute of Aeronautical MaterialsBeijing 100095China Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology Beijing 100095China BAIMTEC Material Co. Ltd.Beijing 100094China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology HarbinHarbin150001China

The chemical composition variation of the TiAl-4722 alloys was examined in a batch of the industrial scale master ingots,and in the corresponding castings prepared by conventional vacuum arc remelting(VAR)combined with induction skull melting(ISM)and investment casting *** content changes of major elements and interstitial elements were evaluated based on the chemical analysis at the top and bottom of the ingots and *** show that the contents of C,N,H,Fe and Si have almost no change in the ingots and castings,suggesting that the chemical analysis on these elements can be based on the batch *** O content keeps almost the same in different ingots,but exhibits relatively large differences in castings,which was probably influenced by the reaction between the shell mold and the molten alloy,and the spalling of face coat of the shell mold during *** the major elements of Al,Nb and Cr,the composition difference between the top and the bottom of the ingots is less than that of the *** for the O element,the trend is different,especially for the castings,suggesting that the investment casting is a homogenization process for Cr and Nb,but a differentiation process for *** contents of major elements in castings fluctuate mainly in the same range as that in the ingots,indicating that the contents of the major elements are controllable during investment casting.

关键词： TiAl alloys melting casting chemical composition casting ingot

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Strengthening low-angle grain boundaries by twinning grids: Improving the ability of γ phase to store and block dislocations in TiAl alloy

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Journal of alloys and Compounds 2025年 1034卷

作者： Yang, Xiaokang Fang, Hongze Zhou, Lingyan Ding, Xianfei Zhang, Yong Chen, Ruirun National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology Heilongjiang Harbin150001 China Zhengzhou Research Institute Harbin Institute of Technology Henan Zhenzhou450000 China Cast Titanium Alloy R&D Center Beijing Institute of Aeronautical Materials Beijing100095 China Heilongjiang Province Key Laboratory of Advanced Mg&Al Alloys Casting and Engineering Application Heilongjiang Harbin150066 China

The twin grid structure enhances low-angle grain boundaries (LAGBs) in the γ phase, effectively storing and hindering dislocations to improve the high-temperature properties of TiAl alloys. Hf was added to Ti-47Al-6Nb-0.1C-1.6Ta alloy and related mechanisms were studied. The results indicate that the addition of Hf promotes the formation of a Hf-enriched γ phase (with an L10 structure, defined as the γHf phase) in the TiAl alloy. The γHf phase is surrounded by a γ phase containing twin grids (with an L10 structure, defined as the γn phase). The γHf and γn phases exhibit close orientations with LAGBs at their interfaces. The Hf and Al-rich regions in the α phase preferentially transform into the γHf phase, with α grain boundary migration making γHf either within the α parent phase or at its boundaries. The residual α phase around γHf undergoes multiple twinning on {111} and {100} planes, ultimately resulting in the formation of the γn phase with twin grids. The 900 ℃ tensile strength and elongation of the Hf-added TiAl alloy reach 620.8 ± 23.1 MPa and 7.27 ± 0.6 %, respectively. The twin grids in the γn phases uniformly accommodate dislocations, while the substantial lattice distortion and strong atomic bonding in γHf impede dislocation activation, resulting in the absence of dislocations within γHf. Consequently, the LAGB between γn and γHf effectively hinders dislocations originating from the twin grids, thereby enhancing the alloy's high-temperature strength. © 2025 Elsevier B.V.

关键词： Tensile strength

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Proactively introducing defects and forming twinning and low angle grain boundaries in the γ phase to particularly improve the 900 °C tensile strengths of theTi-47Al-6Nb-0.1C-1.6Ta alloy

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Materials Science and engineering: A 2025年 940卷

作者： Yang, Xiaokang Fang, Hongze Zhou, Lingyan Li, Kexuan Ding, Xianfei Zhang, Yong Chen, Ruirun National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology Heilongjiang Harbin150001 China Zhengzhou Research Institute Harbin Institute of Technology Henan Zhenzhou450000 China Cast Titanium Alloy R&D Center Beijing Institute of Aeronautical Materials Beijing100095 China Heilongjiang Province Key Laboratory of Advanced Mg&Al Alloys Casting and Engineering Application Heilongjiang Harbin150066 China

Actively introducing different types of defects into γ phase with lower formation energy is an effective method to improve the mechanical properties of TiAl alloys at room and high temperatures. Ta was added in Ti-47Al-6Nb-0.1C alloy (TiAl-0Ta alloy), and defect types, microstructure, mechanical properties at room and 900 °C, and related mechanisms were studied. Results show that four kinds of surface defects are formed in the γ phase between lamellar colonies after adding Ta, including stacking faults (SFs), twin boundaries (TB), low angle grain boundaries (LAGB) and 120° rotation boundaries (RB). Ta promotes SFs generating by reducing the stacking fault energy. Insertion of extrinsic SF changes the stacking order to generate twin. The continuous generation of SFs leads to the widening of twins. Ta substitute Al will form lattice distortion and vacancies. Vacancies are filled by Al atoms to form edge dislocations, resulting in LAGB. The substitution also reduces the formation energy of the RB to form that. Compressive strength and strain of Ti-47Al-6Nb-0.1C-1.6Ta alloy (TiAl-1.6Ta alloy) reached 2606 MPa and 40.6 %, and the 900 °C tensile strength and elongation of alloy reached 550.2 MPa and 10.8 %. The edge dislocation at LAGB, elastic stress field at TB and RB increase the critical resolved shear stress of dislocation and hinder dislocation slip. The SFs decompose the dislocation into partial dislocations to consume its energy. © 2025 Elsevier B.V.

关键词： Tenacity

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Influence of Hydrogen Ingress and Capture on the Mechanical Properties of Spray Formed 2195 Aluminum alloy

SSRN

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SSRN 2024年

作者： Yang, Xiao-Xu Jiang, Yun-Ze Li, Guo-Ai Shen, Xiao-Yu Lai, Xiao-Ming Wang, Xiao-Ya Jiang, Jian-Tang Zhen, Liang School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China Jiangsu Haoran Spray Forming Alloy Co. Ltd. Zhenjiang212000 China Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Engineering Research Center of Advanced Aluminum Alloys and Application Beijing100095 China Beijing Spacecrafts Co. Ltd. Beijing100094 China Shenzhen518055 China National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology Harbin150001 China

The current research has focused on the hydrogen capturing and its impact on the mechanical properties of spray-formed 2195 (SF2195) aluminum alloy. Microstructure characterization, thermal desorption spectra (TDS) and hydrogen trapping of characteristic microstructure, are used to investigate the generation, migration and trapping of hydrogen. The retention of moisture in the carrier gas is believed to induce high concentration of hydrogen and the amorphous Al2O3 layer within the SF2195 billet, and the local retention of carrier gas brings about pores with the Al2O3 layer on the inner wall. High concentration of hydrogen is captured in the hot-rolled alloy while around 60% of the hydrogen can be eliminated during the solution-quenching. Particles of T1 phase trap large quantity of hydrogen and the high-density dislocations developed from the pre-stretch promote the migration of hydrogen towards dispersoids and precipitates. The presence of hydrogen and Al2O3 layers contribute to the reduced plasticity of SF2195 alloy. The spreading of flattened pores can induce intensified hydrogen damage effect in local regions and thus contribute to the unusually decreased ductility along the thickness direction in the T8 aged alloy. © 2024, The Authors. All rights reserved.

关键词： Hydrogen

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