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Influence of microstructural characteristics on corrosion behavior of Mg-5Sn-3In alloy in Hank’s solution

Transactions of Nonferrous Metals Society of China 2021年第10期31卷 2999-3011页

作者： Xue-jian WANG Zong-ning CHEN Yu-bo ZHANG En-yu GUO Hui-jun KANG Pei HAN Tong-min WANG Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Ningbo Institute of Dalian University of Technology Ningbo 315000China Orthopaedic Department Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai 200233China

The microstructural observation,the mass loss test,potentiodynamic polarization measurements and corrosion morphology examinations were conducted to study the influence of microstructural characteristics on corrosion behavior of Mg–5Sn–3In alloys in Hank’s solution after *** results show that the corrosion rate of the as-cast alloy is similar to that of as-extruded alloy;however,the local corrosion susceptibility is greatly weakened in the as-extruded alloy,especially in the extrusion *** relatively uniform corrosion morphology of the as-extruded alloy is attributed to refined Mg_(2)Sn particles,uniform distribution of Mg_(2)Sn particles and favorable crystal ***,the cytotoxicity tests confirm that the Mg–5Sn–3In alloy exhibits cytotoxicity of Grade 0−1 for NIH3T3 cells,suggesting an acceptable cytotoxicity of this alloy in the vitro assay.

关键词： Mg–Sn alloy indium element microstructure corrosion behavior cytotoxicity

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Microstructure and Mechanical Behavior of CrFeNi2V0.5Wx(x=0,0.25)High-Entropy Alloys

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Acta Metallurgica Sinica(English Letters) 2020年第8期33卷 1117-1123页

作者： Hui Jiang Tian-Dang Huang Chao Su Hong-Bin Zhang Kai-Ming Han Sheng-Xue Qin College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Solidifi cation Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China

CrFeNi2V0.5Wx(x=0,0.25)alloys based on these parameters of mixing enthalpy(△Hmix,mixing entropy(△Smix,atomic radius difference(δ),valance electron concentration,and electronegativity difference(△χ)were designed and *** microstructure and room-temperature mechanical behavior of both alloys were *** test results showed that the CrFeNi2V0.5W0.25 alloy had higher yield strength than that of the W-free CrFeNi2V0.5 alloy,although they all exhibited quite larger compressive plasticity(ε>70%).Compression fracture surface of CrFeNi2V0.5W0.25 alloy revealed a ductile fracture in the face-centered cubic(FCC)phase and a brittle-like fracture in theσ***,tensile test results indicated that the CrFeNi2V0.5W0.25 alloy exhibited excellent mechanical property with an ultimate tensile strength of 640 MPa and a high tensile elongation of 15.7%.The tensile deformation mode of the FCC phase in the CrFeNi2V0.5W0.25alloy is dominated by planar glide,relating to dislocation configurations,high-density dislocations,and dislocation ***,dislocation slip plays a significant role in tensile deformation of CrFeNi2V0.5W0.25 high-entropy *** higher strength of CrFeNi2V0.5W0.25 alloy is predominantly due to the solid solution strengthening of W element andσphase precipitation *** of the higher tensile strength and plasticity suggests that the CrFeNi2V0.5W0.25 alloy can be a promising aerospace material.

关键词： High-entropy alloy Microstructure Mechanical property Deformation behavior

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The influence of Sc addition on microstructure and tensile mechanical properties of Mg-4.5Sn-5Zn alloys

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Journal of Magnesium and Alloys 2019年第3期7卷 456-465页

作者： Pengqi Wang Enyu Guo Xuejian Wang Huijun Kang Zongning Chen Zhiqiang Cao Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province)School of Materials Science and EngineeringDalian University of TechnologyDalian 116024PR China

The microstructure and tensile properties of the as-cast and as-rolled Mg-4.5Sn-5Zn alloys by adding various Sc content were *** of the tensile properties in as-cast Sc-containing alloys is attributed to the grain refinement and modification of secondary phase *** types of precipitates,namely spherical Mg2Sn,rod-like MgZn and Sc-rich phases were dispersed in the matrix of the Sc added M g-4.5Sn-5Zn alloys after hot rolling *** addition,weakening and deflecting of the basal texture in as-rolled alloys were found and were attributed to Sc *** increasing the Sc addition rate to 0.4 wt.%,however,resulted in the clustering of the Sc-rich phases and was found to reduce the tensile properties of the alloy,especially the *** as-rolled Mg-4.5Sn-5Zn-0.3Sc alloy exhibits an optimum combination of tensile *** ultimate tensile strength,yield strength and elongation are 293.0MPa,164.2Mpa and 21.5%,respectively,and the elongation is about 68%higher than that of Sc-free alloy.

关键词： Magnesium alloys Scandium Microstructure Mechanical properties

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Novel(CoFe2NiV0.5Mo0.2)100-xNbx Eutectic High-Entropy Alloys with Excellent Combination of Mechanical and Corrosion Properties

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Acta Metallurgica Sinica(English Letters) 2020年第8期33卷 1046-1056页

作者： Ren Li Jing Ren Guo-Jia Zhang Jun-Yang He Yi-Ping Lu Tong-Min Wang Ting-Ju Li Key Laboratory of Solidifi cation Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Max-Planck-Institut für Eisenforschung GmbH 40237 DusseldorfGermany

The emergence of eutectic high-entropy alloys(EHEAs)offers new insights into the design of next generation structural alloys,which is due to their stable dual-phase microstructure and outstanding mechanical properties from room to elevated *** this work,a series of(CoFe2 NiV0.5Mo0.2)100-xNbx(0≤x≤12)EHEAs were designed and prepared via vacuum *** eutectic microstructure composing lamellar face-centered cubic solid solution phase and C14 Laves phase appears in the as-cast EHEA when x=*** microstructure turns to hypoeutectic or hypereutectic when x is below or beyond that critical value *** volume fraction of the hard Laves phase is proportional to the Nb addition,leading to the strength increment yet at the expense of ductility at room *** particular,the EHEA having4 at%Nb shows a compressive strength of 2.1 GPa with an elongation to fracture of 45%,while EHEAs containing 9 and10 at%Nb exhibit ultrahigh yield strengths of over 1.4 *** effect of Nb addition on the corrosion resistance of this Crfree EHEA system was also *** EHEA containing 9 at%Nb has the best anti-corrosion performance in the 3.5 wt%NaCl solution at 298±1 K,indicating a good combination of mechanical and corrosion properties.

关键词： Eutectic high entropy alloys Laves phase Microstructure Mechanical properties Corrosion property

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Tungsten-containing high-entropy alloys: a focused review of manufacturing routes, phase selection, mechanical properties, and irradiation resistance properties

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Tungsten 2021年第2期3卷 181-196页

作者： Tian-Xin Li Jun-Wei Miao En-Yu Guo He Huang Jun Wang Yi-Ping Lu Tong-Min Wang Zhi-Qiang Cao Ting-Ju Li Key Laboratory of Solidifi cation Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Institute of Materials China Academy of Engineering PhysicsMianyang 621907China State Key Laboratory of Solidifi cation Processing Northwestern Polytechnical UniversityXi’an 710072China High Entropy Alloy Materials Engineering Research Center(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China

Alloying is one of the most effective means to confer superior properties to metal *** far too long,conventional W-based alloys were generally improved by the addition of minor *** exploitation of conventional W-based alloy is restricted to the corner of multielement phase diagrams with tiny compositional ***-entropy alloys(HEAs)are a novel kind of alloys consisting of multi-principal alloying elements(usually more than 4)and have attracted increasing attention,since they were first reported in *** emergence of HEAs filled the gap of the unexplored central region of multielement phase *** them,tungsten-containing HEAs(TCHEAs)exhibit excellent mechanical properties,especially at extraordinarily elevated ***,recent studies showed that TCHEAs had outstanding irradiation resistance *** might serve as a promising candidate for plasma-facing materials in the fusion *** characteristics of TCHEAs are different from other HEAs due to the addition of tungsten with ultrahigh-melting ***,this paper aimed to introduce the manufacturing routes of TCHEAs;review the phase selection,mechanical properties,and irradiation resistance properties of TCHEAs;and propose the future prospects of TCHEAs.

关键词： Tungsten-containing high-entropy alloys Irradiation resistance properties Mechanical properties Manufacturing routes Phase selection

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A Novel Series of Refractory High-Entropy Alloys Ti2ZrHf0.5VNbx with High Specific Yield Strength and Good Ductility

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Acta Metallurgica Sinica(English Letters) 2019年第8期32卷 925-931页

作者： Dong-Xu Qiao Hui Jiang Wen-Na Jiao Yi-Ping Lu Zhi-Qiang Cao Ting-Ju Li Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China

A series of Ti2ZrHf0.5VNbx( x = 0, 0.25, 0.5, 0.75 and 1.0) refractory high-entropy alloys were prepared to investigate the alloying effect of Nb on the microstructures and mechanical *** the alloys displayed a simple BCC *** microstructures of the alloys changed from the initial single-phase columnar structure( x = 0) to dendrite microstructure( x > 0).At room temperature, all the alloys exhibited high ductility(with the compressive strains of more than 50%).With the increase in Nb content, the yield strength slightly decreased from 1160 to 980 MPa and the hardness dropped from 338 to 310 ***, the alloys exhibited low density from 6.47 to 6.84 g/cm3 and high specific yield strength(SYS) from 143 to 179 kPa m3/*** comprehensive performance of ductility and SYS was superior to most of the reported highentropy *** yield strength of the alloys increased from 405 to 859 MPa and from 85 to 195 MPa with the addition of Nb element at 873 K and 1073 K, respectively.

关键词： Specific yield strength Refractory metals Structure Mechanical properties

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Investigation of mechanical properties for bio-inspired lattice metamaterials with crossed struts in multiple units

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Materials Today Communications 2025年

作者： Jiawen Li Yu Bai Endian Liu Wei Ji Jiaqi Zhang Wei Yu Hai Hao Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China Ningbo Research Institute of Dalian University of Technology Ningbo 315016 China Inner Mongolia Metal Material Research Institute

Lattice materials are novel materials with cellular cells whose properties can be customized by adjusting the topology structure. In this work, inspired by the crossed-lamellar structure found in natural mollusk shells, a cross-strengthening strategy was proposed to enhance the mechanical property performance of Ti-6Al-4V lattices. A selective laser melting technique was used to fabricate samples, and finite element simulations and experiments were carried out to investigate the mechanical performance. The elastic anisotropy of the samples was also analyzed using the asymptotic homogenization method. The results demonstrate that the proposed cross-strengthening strategy, with multiple cells as the design space, can result in simple cubic lattices having better mechanical properties than structures with the same material and relative density. Furthermore, a generalized model for predicting the compressive strength of Ti-6Al-4V lattice materials fabricated by any additive manufacturing process was developed, and its accuracy was verified.

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Strengthening and High-Temperature Softening Resistance of Low Si-Added Cu-Cr-Zr Alloy for Fusion Reactor Application

SSRN

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SSRN 2022年

作者： Qu, Jianping Yue, S.P. Zhang, Wenshu Guo, Zhongkai Dong, Bowen Jie, J.C. Cao, Z.Q. Fu, Y. Li, T.J. Key Laboratory of Solidification Control and Digital Preparation Technology Liaoning Province China School of Materials Science and Engineering Dalian University of Technology China School of Opto-electronic Engineering Zao Zhuang University Zao Zhuang277160 China School of Mechanical and Electrical Engineering Hubei Polytechnic University Huangshi435003 China Ningbo Institute of Dalian University of Technology Ningbo315000 China Songshan Lake Materials Laboratory Dongguan523808 China

It is urgent to develop new Cu-Cr-Zr-X alloy to be used in the International Thermonuclear Energy Reactor (ITER). In this work, Cu-0.8Cr-0.12Zr-(0.05Si) alloy with increasing high-temperature softening resistance was designed and fabricated. Thermo-mechanical treatment was employed on Cu-Cr-Zr alloys with and without Si in order to study the function mechanism of Si addition on the mechanical properties and high-temperature softening resistance. The Si-containing Cu-Cr-Zr alloy exhibits higher ultimate tensile strength of 622 MPa, yield strength of 588 MPa with a considerable elongation of 17% compared with the Si-free alloy. The dislocation and Orawan strengthening trigged for finer Cr precipitates are proven to be the main reasons for the improvement in strength. Moreover, the increase in elongation originates from the deformation twins due to the lower stacking fault energy, as confirmed by the first principles . Meanwhile, the addition of Si can significantly improve the high-temperature softening resistance of the alloy . The main reason is that the growth of Cr precipitates is suppressed by adding Si, and its pinning effect on the boundary is better, thereby inhibiting the occurrence of recrystallization. © 2022, The Authors. All rights reserved.

关键词： Chromium alloys

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Brittle-to-ductile transition in Ti–Pt intermetallic compounds

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Science Bulletin 2021年第22期66卷 2281-2287,M0003页

作者： Beikai Zhao Qinghua Zhang Xiaoqian Fu Dongxu Qiao Ling Zhang Xiao Chen Lin Gu Yiping Lu Qian Yu Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Beijing National Laboratory for Condensed Matter Physics Collaborative Innovation Center of Quantum MatterInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China College of Materials Science and Engineering Chongqing UniversityChongqing 400045China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Phase transformation changes numerous properties of materials. Ti–Pt alloys have received much interest because of high martensitic transformation temperature. However, the intrinsic brittleness of these intermetallic compounds with low crystal symmetry and complicated phase structure limit their applications,especially when composition deviates from stoichiometry ratio. By performing in situ heating high-resolution scanning transmission electron microscopy experiment and micro-mechanical testing on Ti-35 at% Pt that contained majorly Ti3Pt and αTiPt phases, it was found that precipitating herringbone twinned αTiPt islands within Ti3Pt could occur upon heating, significantly refining mixed-phase structure. The refinement of multi-intermetallic mixed-phase structure endowed brittle material with remarkable capacity for plastic deformation and strain hardening. The plastic deformation mechanisms include phase transformation upon yielding and dislocation slips during hardening, which rarely occurs in intermetallic compounds with low symmetry. The strong interaction between different deformation modes even caused nano-crystallization along slip bands. The results demonstrate that brittle-toductile transition in intermetallic compounds can be achieved by tuning mixed-phase structure through phase transformations.

关键词： Intermetallic compounds Phase transformation Structure refinement Ductility Brittle-to-ductile transition

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Deformation Behavior of a Bi-Layered Bronze/Steel Sheet: Synergetic Effects of Microstructure and Residual Stress

SSRN

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SSRN 2022年

作者： Jiang, Xingrui Miao, Kesong Wu, Hao Li, Rengeng Xia, Yiping Chen, Min Zhao, Yuyuan Jie, Jinchuan Fan, Guohua School of Advanced Technology Xi’an Jiaotong-Liverpool University Suzhou215123 China Key Laboratory for Light-Weight Materials Nanjing Tech University Nanjing210009 China Advanced Materials Research Institute Yangtze Delta Suzhou215000 China School of Engineering University of Liverpool LiverpoolL69 3GH United Kingdom Key Laboratory of Solidification Control and Digital Preparation Technology School of Materials Science and Engineering Dalian University of Technology Dalian116024 China

Bi-layered Cu-Pb-Sn bronze/steel sheets serving as raw material for load-bearing shells require urgent upgrading of mechanical properties for service safety. This study investigated the mechanical properties and deformation behaviors of a bi-layered Cu-Pb-Sn bronze/steel sheet prepared by solid‒liquid continuous casting (SLC). The samples were identified by two types of bronze microstructures: homogeneous and segregated Pb phase distributions, denoted as HP and SP, respectively. These samples were tested for their tensile properties and residual stress. We found that the yield strength and fracture elongation of SP are higher than those of HP, contrary to the general understanding that Pb phase segregation will degrade the mechanical properties of Cu-Pb-Sn alloys. Characterization of the fractures and residual stress results suggest that the increase in SP yield strength is attributed to the higher required shear stress for yielding induced by the residual stress state. The higher fracture elongation originates from the formation of multiple cracks that accommodate the bi-layered structure's deformation incompatibility. © 2022, The Authors. All rights reserved.

关键词： Residual stresses

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