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Microstructure and mechanical properties of WMoTaNbTi refractory high-entropy alloys fabricated by selective electron beam melting

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Journal of Materials Science & Technology 2022年第13期108卷 54-63页

作者： Bang Xiao Wenpeng Jia Huiping Tang Jian Wang Lian Zhou State Key Laboratory of solidification Processing Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Porous Metal Materials Northwest Institute for Non-ferrous Metal ResearchXi’an 710016China

WMoTaNbTi RHEAs formed by SEBM with negative defocus distance were *** scanning speeds were applied,an electron beam with scanning speed at 2.5 m/s completely fused the premixed WMoTaNb alloyed powder and pure Ti *** vaporization of Nb and Ti elements happened during the formation of WMoTaNbTi RHEAs,however,the single BCC phase remains *** solid-solute strengthening caused by elemental vaporization,dropping percentage of Nb and Ti solutes in the matrix as well as improved ductilizing effects with decreasing scanning speeds leads to falling microhardness and better local *** of scanning speed at 4.0 m/s,3.5 m/s,3.0 m/s and 2.5 m/s is 578±17 HV,576±12 HV,573±10 HV and 511±2 HV,*** as-deposited WMoTaNbTi RHEA formed at a scanning speed of 2.5 m/s displays ultimate strength of 1312 MPa.

关键词： Refractory high-entropy alloys Selective electron beam melting solidification cracking Porosity solid-solution strengthening

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Microstructure and mechanical properties of Ti−Nb−Fe−Zr alloys with high strength and low elastic modulus

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Transactions of Nonferrous Metals Society of China 2022年第2期32卷 503-512页

作者： Qiang LI Qi HUANG Jun-jie LI Qian-feng HE Masaaki NAKAI Ke ZHANG Mitsuo NIINOMI Kenta YAMANAKA Akihiko CHIBA Takayoshi NAKANO School of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai 200093China CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Technical Institute of Physics&ChemistryCASUrumqi 830011China Division of Mechanical Engineering Faculty of Science and EngineeringKindai University3-4-1 KowakaeHigashiosakaOsaka 577-8502Japan School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China Institute for Materials Research Tohoku University2-1-1 KatahiraAoba-kuSendai 980-8577Japan Division of Materials and Manufacturing Science Graduate School of EngineeringOsaka University2-1 Yamada-OkaSuitaOsaka 565-0871Japan Department of Materials Science and Engineering Graduate School of Science and TechnologyMeijo University1-501 ShiogamaguchiTempaku-kuNagoya 468-8502Japan

Zr was added to Ti−Nb−Fe alloys to develop low elastic modulus and high strengthβ-Ti alloys for biomedical *** of Ti−12Nb−2Fe−(2,4,6,8,10)Zr(at.%)were prepared by arc melting and then subjected to homogenization,cold rolling,and solution *** phases and microstructures of the alloys were analyzed by optical microscopy,X-ray diffraction,and transmission electron *** mechanical properties were measured by tensile *** results indicate that Zr and Fe cause a remarkable solid-solution strengthening effect on the alloys;thus,all the alloys show yield and ultimate tensile strengths higher than 510 MPa and 730 MPa,*** plays a weak role in the deformation ***,twinning occurs in all the deformed alloys and is beneficial to both strength and ***−12Nb−2Fe−(8,10)Zr alloys with metastableβphases show low elastic modulus,high tensile strength,and good plasticity and are suitable candidate materials for biomedical implants.

关键词： biomedical Ti alloy mechanical properties solid-solution strengthening work hardening twinninginduced plasticity

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