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Revealing effects of powder reuse for LPBF-fabricated NiTi shape memory alloys

Frontiers of Materials Science 2024年第4期18卷 191-201页

作者： Xiang Li Meng Zhou Sihui Peng Xiaonan Chen Xueyuan Ge Bingmin Huang Lishan Cui Shijie Hao College of New Energy and Materials China University of PetroleumBeijing 102249China State Key Laboratory of Advanced Forming Technology and Equipment China Machinery Institute of Advanced Materials Co.Ltd.Zhengzhou 450001China Jiangsu Smart Advanced Material Technology Co. Ltd.Xuzhou 221000China

In metal-based additive manufacturing processes,such as laser powder bed fusion(LPBF),the powder utilization is often less than 50%.Considering the cost efficiency,powder reuse is needed for an economical and sustainable LPBF *** intermetallic compounds,LPBF-fabricated NiTi alloys are characterized with phase transformation behaviors,mechanical properties and functions that are very sensitive to possible changes in powder characteristics caused through reuse,but the exact effects are still poorly ***,the LPBF process has been repeated ten times using the virgin powder supplement *** show that the oxygen content of NiTi powders rises from 370 to 752.3 ppm with the enhancement of the reuse cycle *** oxidation enhances the laser absorptivity of the powder bed,leading to an increase in surface roughness and porosity of NiTi *** to the specimens made from virgin powders,the mechanical property and shape memory function of specimens made from reused powders are degraded,mainly attributed to the oxygen impurity and deteriorated forming *** study allows making better decisions with regard to powder reuse in the development of performance-critical NiTi parts fabricated through LPBF.

关键词： laser powder bed fusion NiTi shape memory alloy powder reuse microstructure mechanical property

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Mechanism of high-energy pulsed current-assisted rolling of 08AL carbon steel ultra-thin strip

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Journal of Iron and Steel Research International 2024年第2期31卷 416-427页

作者： Zhong-kai Ren Ya-nan Xu Jia-zhao Chen He Li Rui-lin Yuan Zhen-hua Wang Tao Wang Xiao Liu College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan030024ShanxiChina Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment(Ministry of Education) Taiyuan University of TechnologyTaiyuan030024ShanxiChina National Key Laboratory of Metal Forming Technology and Heavy Equipment China National Heavy Machinery Research Institute Co.Ltd.Xi’an710016ShaanxiChina

To improve the plastic deformation performance of a 08AL carbon steel ultra-thin strip,a pulsed electric field was integrated into the plastic processing of the ultra-thin strip,and the effects of high-energy current on its deformation ability were ***-assisted tensile tests were employed,and the results clarified that the pulsed current could reduce the activation energy of faults and promoted dislocation slip within grains and at grain boundaries,leading to a decrease in the deformation resistance of the metal and an increase in its plastic *** the current density of 2.0 A/mm2,the yield strength,tensile strength,and elongation of the rolled sample reached 425 MPa,467 MPa,and 12.5%,*** the rolling process,it was found that the pulsed current promoted the dynamic recrystallization of the ultra-thin strip,reduced its dislocation density and deformation resistance,and promoted the coordinated deformation of the metal.

关键词： 08AL ultra-thin strip High-energy pulsed current Mechanical property Dislocation density Dynamic recrystallization

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Effect of two-pass rolling of textured roll and polished roll on surface topography and mechanical properties of 316L stainless steel ultra-thin strip

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Journal of Iron and Steel Research International 2025年第1期32卷 186-197页

作者： Zeng-qiang Zhang Xi Liao Zhong-kai Ren Zhen-hua Wang Ya-xing Liu Tao Wang Qing-xue Huang College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan030024ShanxiChina Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment of Ministry of Education Taiyuan University of TechnologyTaiyuan030024ShanxiChina National Key Laboratory of Metal Forming Technology and Heavy Equipment Taiyuan University of TechnologyTaiyuan030024ShanxiChina Shanxi TISCO Stainless Steel Precision Strip Co. Ltd.Taiyuan030032ShanxiChina

The textured roll and polished roll were applied instead of the ground roll in a 20-high mill to conduct two-pass rolling of 316L stainless steel strip with thickness of 0.027 *** the two-pass rolling with the textured roll and polished roll(TPR),the surface roughness of the strip is dramatically reduced,and the surface topographical anisotropy index is diminished to 30.9%of the initial *** with the strip rolled using the ground roll in both passes(GGR),the elongation of TPR rolled strip is obviously improved,and the mechanical property anisotropy is greatly *** anisotropy index of tensile strength and elongation are 42.58%and 52.59%of that of GGR rolled strip,which is mainly attributed to the significant decrease of the texture intensity of the strip by TPR *** results indicate that TPR process can obtain the stainless steel ultra-thin strip with smooth and uniform surface topography and good mechanical properties.

关键词： Textured roll Polished roll Surface topography Mechanical property Stainless steel ultra-thin strip

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Improvement of impact properties of Al-Si-Mg alloy via solution treatment and joint modification with Sr and La

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Rare Metals 2024年第7期43卷 3301-3313页

作者： Xiong-Ling Zheng Shao-Xiang Li Jia-Le Ma Qing-Yan Xu Hai-Dong Zhao Zhi-Qiang Han Key Laboratory for Advanced Materials Processing Technology Ministry of EducationSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China National Engineering Research Center of Near-Net Shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510641China

An effort to obtain superior impact properties for Al-7Si-0.35 Mg alloy is presented,where modification with 0.02 wt% Sr and 0.1 wt% La as well as solution treatment was jointly *** samples were solution treated at 535℃ for 15 min to 12 *** microstructure,fracture mechanism,and their correlation with the impact properties of the alloy were studied in detail mainly through optical microscopy(OM),scanning electron microscopy(SEM) and oscillography impact *** results show that the addition of Sr and La refined the eutectic Si particles significantly from~ 2.05 μm(modified with Sr alone) to~ 0.75 μm in as-cast microstructure,leading to a very homogeneous distribution of spheroidized Si particles in the alloy solution treated at 535℃ for 8 *** alloy exhibits excellent impact toughness up to 75 J·cm^(-2),which is much higher than the maximum impact toughness of the alloys modified by Sr alone(~ 46 J·cm^(-2)).The major reason for this remarkable increase in the impact property is the dramatic increase in crack initiation *** dispersoid-free zones(DFZs)near the eutectic regions mainly consist of the ductile Al-matrix,which exhibits excellent *** ductile Al-matrix of the DFZs hinders the crack propagation,resulting in a significant increase in crack propagation energy.

关键词： Aluminum alloys Modification Solution treatment Microstructure Impact properties Fracture mechanism

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Microstructure and Mechanical Properties of TC4 Titanium Alloy Joint Fabricated By Vortex Flow-Based Friction Stir Welding

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Chinese Journal of Mechanical Engineering 2024年第6期37卷 183-198页

作者： Xiaochao Liu Pengyu Zhang Wentao Li Tao Ye Chuanchao Xia Tairui Zhang Junmiao Shi Jilin Xie Zhonghua Ni School of Mechanical Engineering Southeast UniversityNanjing 211189China Advanced Ocean Institute of Southeast University Nantong 226010China Key Laboratory of Pressure Systems and Safety Ministry of EducationEast China University of Science and TechnologyShanghai 200237China Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components Nanchang Hangkong UniversityNanchang 330063China

Tool wear is a critical challenge in titanium alloy friction stir welding(FSW).Vortex flow-based FSW(VFSW)is a potential solution for this issue because the VFSW process uses a similar material to the base metal as the *** this study,TC4 titanium alloy was welded by VFSW for the first *** optimization of the vortex flow formation is first done,and then the weld formation and the joints'microstructure and mechanical performance are investigated at different traversing *** results prove that the plunging velocity is the dominant factor in the vortex depth.A lower plunging speed is beneficial for the formation of a deeper *** penetration is achieved at traversing speeds of 50–120 mm/min at 300 r/*** welding speed above 130 mm/min,insufficient penetration defects *** the heat affected zone,grain coarsening andβ-phase volume fraction increase arise,whereas,in the weld nugget,anα+βlamellar structure *** the optimized parameters,the joint tensile strength is nearly 98%of the base material,but the elongation decreases *** oxides drawn into the weld by the vortex at the junction between the vortex and the base material are the main reason for the small *** study proves that the VFSW process is feasible for titanium alloys.

关键词： FSW Microstructure Vortex flow Weld formation Mechanical performance Titanium alloy

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In situ regulating intimately connected heterostructure by decomposition of solid solution oxides toward high-efficient water oxidation

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Rare Metals 2024年第4期43卷 1557-1569页

作者： Shao-Fei Zhang Xiao-Lu Yin Jin Wang Jian-Li Kang Tian-Tian Li Jin-Feng Sun Yong-Qiang Meng Jian-Jiang Wang Dian-Long Wang Kai-Qiang Qin Hebei Key Laboratory of Flexible Functional Materials/Hebei Key Laboratory of Material Near-Net Forming Technology School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang050018China Key Laboratory of Advanced Ceramics and Machining Technology/Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin300072China Electrochemical Engine Center Department of Mechanical EngineeringPennsylvania State UniversityUniversity ParkPA16802USA

Heterogeneous interfaces produced by interdomain interactions on a nanoscale performs a crucial role in boosting the properties of an electrocatalyst toward oxygen evolution reaction(OER)***,a series of dual-phase electrodes with intimately connected heterointerfaces are prepared by in situ decomposing solid solution oxide of Ni_(x)Co_(y)Fe_(100-x-y)O,which grew on Ni foam massively via an ultrafast combustion ***,with high-reaction kinetics caused by the reduction treatment at 450℃,the less electronegative Fe and Co are more oxyphilic than Ni,which facilitated their co-exsolution and formation of CoFe_2O_4/NiO oxide with enriched oxygen *** from the nanoporous framework,heterojunction structure,and oxygen defects,the self-supporting electrodes present rapid charge/mass transmission and provide abundant active sites for *** optimized sample(R-SNCF4.5)shows low overpotentials of 226 and 324 mV at 10 and100 mA·cm^(-2),a small Tafel slope(46.7 mV·dec^(-1)),and excellent *** assembled R-SNCF4.5//Pt/C/NF electrolyzer demonstrates continuous electrolysis over 50 h at a current density of 10 mA·cm^(-2),under 1.51 *** functional theory(DFT)calculations verify that the strong electronic modulation plays a critical part in the CoFe_2O_4/NiO hybrid by lowering the energy barriers for the ratedetermining steps,and Fe sites are the most active OER sites.

关键词： Rapid combustion Decomposition of solid solution oxide Dual-phase heterostructure Oxygen evolution reaction Theoretical calculation

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Formative manufacturing of heterogeneous composite plates: a review

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Materials Today 2025年 86卷 548-574页

作者： Zhang, Jia Yang Li, Feng Niu, Wen Tao Wang, Zi Yi Cao, Mu Zi School of Materials Science and Chemical Engineering Harbin University of Science and Technology Harbin150040 China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology Harbin150080 China Heilongjiang Provincial Key Laboratory of Light Metal Materials Modification & Green Forming Technology Harbin University of Science and Technology Harbin150040 China

The integration of superior characteristics from individual components achievable in heterogeneous composite plates can be achieved through optimal material configuration and combination methods. This approach results in significant enhancements in physical, mechanical, and forming properties when compared to traditional single metal plates. However, challenges such as prolonged manufacturing cycles and the complexity of coordinating interface characteristics and microstructural properties impede the rapid advancement and widespread adoption of heterogeneous composite plate manufacturing. This study offers a comprehensive overview of the primary forming methods for heterogeneous composite plates, including rolling, extrusion, welding, hot pressing, and additive manufacturing. It addresses current challenges and anticipates potential developmental directions, such as the application of specialized energy field-assisted forming techniques and the design of heterogeneous microstructures. The exploration of new resources, the expansion of innovative concepts, the establishment of novel models, the promotion of new principles, and the adoption of transformative technologies are essential for the breakthrough development of heterogeneous composite plate manufacturing. Aligning with the national innovation-driven development strategy and the requirements of major national projects remains a fundamental objective of this research direction. © 2025 Elsevier Ltd

关键词： Hot pressing

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Dual Strengthened Control of Recrystallization Behavior on CVCDE Magnesium Alloy Containing Characteristic Structure

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Acta Metallurgica Sinica(English Letters) 2023年第11期36卷 1805-1821页

作者： Nan Bian Feng Li Wentao Niu Chao Li Yuanqi Li School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin150040China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin150080China Heilongjiang Provincial Key Laboratory of Light Metal Materials Modification and Green Forming Technology Harbin University of Science and TechnologyHarbin150040China

Various characteristic structures in typical magnesium alloys,including dislocation cells,substructures and twins,have an important influence on the dynamic recrystallization behavior,and the DRX(dynamic recrystallization)behavior is closely related to the grain refinement and texture weakening of the hot deformed ***,this study reveals the influence of the above characteristic structures on the dynamic recrystallization behavior of magnesium alloys,which have great significance for regulating the high-performance hot deformed microstructure of magnesium alloys and optimizing the macro mechanical *** this study,continuous variable channel direct extrusion(CVCDE)magnesium alloy was prepared by CVCDE,and its macro mechanical properties including hardness and uniaxial tension were *** thermoplastic deformation behavior and texture evolution of magnesium alloy with characteristic structure were analyzed by electron back-scattering diffraction *** is found that the dislocation recombination was realized by deformation mechanism(slip,climb and cross slip),the formation of grain substructure in coarse grains and the induction of recrystallization by twins promote the recrystallization behavior in hot deformed structures more adequate,which effectively improves the degree of microstructure refinement and deformation uniformity.

关键词： Characteristic structure Continuous variable channel direct extrusion(CVCDE) Dynamic recrystallization Regulation Mechanical property

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Application of Rapid Manufacturing Process & Equipment System for Large Complex Light Alloy Structural Components 75

Application of Rapid Manufacturing Process & Equipment Syste...

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75th World Foundry Congress, WFC 2024

作者： Hong, Haichun State Key Laboratory of Advanced Forming Technology and Equipment Beijing National lnnovation Institute of Lightweight Ltd. Beijing China

This paper introduces the key technologies of light alloy fire-retardant sand printing and forming processes, including material system optimization, feedstock ratios, mixing methods, and in-house developed additive manufacturing equipment. Through the shape-controllable composite mold technology, the challenges of matching and precise regulation between mold and casting properties have been addressed, enabling rapid manufacturing through mold-less composite forming. The impact of multi-material composite molds on the performance of castings has been investigated, leading to the invention of corresponding control principles and assembly methods. Furthermore, addressing the influence of sand parameters on forming quality and tool wear, formulas comprising materials such as quartz sand, zircon sand, and chromite sand have been devised, achieving synergistic optimization of mold properties. Finally, for future needs, ceramic core additive manufacturing equipment has been developed to further advance material forming technology. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Foundry sand

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Microstructural evolution and superelastic properties of ultrafine-graine d NiTi-base d shape memory alloy via sintering of amorphous ribbon precursor

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Journal of Materials Science & technology 2023年第7期138卷 80-92页

作者： W.S.Cai H.Z.Lu H.Z.Li Z.Liu H.B.Ke W.H.Wang C.Yang National Engineering Research Center of Near-net-shape Forming for Metallic Materials Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic MaterialsSouth China University of TechnologyGuangzhou 510640China Songshan Lake Materials Laboratory Dongguan 523808China Institute of Physics Chinese Academy of SciencesBeijing 100190China

NiTi-based shape memory alloys(SMAs)are considered as cutting-edge intelligent functional ***,it remains a great challenge to obtain ultrafine-grained(UFGed)bulk materials with mm-scale size as well as outstanding superelastic ***,UFGed bulk Ti_(35)Zr_(15)Ni_(35)Cu_(15)NiTi-based SMA is successfully prepared via spark plasma sintering of amorphous ribbon precursor at different sintering temperatures,and microstructural evolution and superelastic properties are symmetrically *** is found that its grain size ranges from UFG to micro-grain with increased sintering temperature regard-less of the predominant B2 matrix in all bulk ***,the orientation relationships between B2 matrix and nano-scale fcc(Ti,Zr)_(2)Ni precipitate evolve from coherent to ***,the UFGed samples exhibit perfect superelasticity with the high recoverable strain of∼5.8%,the stable recov-ery rate above 99%,and the great critical stress inducing martensitic transformation higher than 1 GPa,far superior to the corresponding ones of suction-cast micro-grained TiZrNiCu ***,the perfect superelasticity is attributed to the good resistance to dislocation slip or grain boundary slip by residual nano-scale amorphous phase or secondary phase of coherent and semi-coherent fcc(Ti,Zr)_(2)Ni *** addition,the gentle superelastic plateau is associated to the favorable transfer stress and the strong ability to accommodate dislocation movement,which is generated by the coherent interface between nano-scale fcc(Ti,Zr)_(2)Ni and UFGed B2 *** results suggest that spark plasma sintering of amorphous alloy precursor is a feasible route to obtaining excellent superelasticity in NiTi-based SMAs.

关键词： Shape memory alloy Amorphous alloy Microstructure Superelasticity

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