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Microstructure Evolution and Mechanical Behavior of Laser Melting Deposited TA15 Alloy at 500℃ under In-Situ Tension in SEM

查看全文 作　　者：Muhammad [1]Rizwan;Junxia [1]Lu;Fei [2]Chen;Ruxia [1]Chai;Rafi [1]Ullah;Yuefei [1]Zhang;Ze [1,3]Zhang 高影响力作者 机构地区：[1]Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;[2]Beijing Key Laboratory of Special Elastomer Composite Materials,College of Materials Science and Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;[3]Department of Materials Science and Engineering,Zhejiang University,Hangzhou 310058,China高影响力机构 出　　处：《Acta Metallurgica Sinica(English Letters)》索引2021年第34卷第9期,共12页高影响力期刊 基　　金：supported by the Basic Science Center Program for Multiphase Media Evolution in Hypergravity of the National Natural Science Foundation of China(No.51988101);the Beijing Natural Science Foundation,China(No.2202017)。 摘　　要：TA15 alloy fabricated by laser melting deposition was investigated at 500℃ under tensile deformation. The damage behavior of microstructure was analyzed by the real time observation of the microstructure evolution, microcracks initiation and propagation using in-situ tensile equipment fitted in the SEM chamber. Finally, the mechanism of fracture was discussed. The result showed anisotropic mechanical properties in X-and Z-direction. The existence of columnar β grains and its orientation to the tensile direction were the major factors inducing the anisotropic mechanical properties. As compared to Z-direction specimen, high tensile strength was observed in X-direction specimen due to the resistance in slips propagation provided by the prior-β grain boundaries( β GBs). Accumulation of the cracks at prior β GB caused the shear fracture. In case of Z-direction specimen, parallel orientation of prior β GB and GB α with the tensile direction resulted in a homogeneous deformation. The high reduction of cross section showed the enhanced ductile characteristics at high temperature. 关 键 词：TA15 alloy In-situ tensile High temperature mechanical property FRACTURE Laser additive manufacturing Crack propagation
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