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Effect of rotationally accelerated shot peening on the microstructure and mechanical behavior of a metastableβtitanium alloy

查看全文 作　　者：Xinkai [1]Ma;Zhuo [1]Chen;Dongling [1]Zhong;[1]SNLuo;Lei [2]Xiao;Wenjie [2]Lu;Shanglin [3]Zhang 高影响力作者 机构地区：[1]Key Laboratory of Advanced Technologies of Materials(Ministry of Education),School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China;[2]State Key Laboratory of Solidification Processing,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China;[3]National Key Laboratory of Reactor System Design Technology,Nuclear Power Institute of China,Chengdu 610041,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2021年第16期,共12页高影响力期刊 基　　金：supported financially by the Scientific Challenge Project of China(No.TZ2018001);the National Natural Science Foundation of China(No.11627901)。 摘　　要：Microstructural evolution and deformation mechanism of a metastableβalloy(Ti-10 V-2 Fe-3 Al)processed by rotationally accelerated shot peening(RASP)were systematically investigated with optical microscopy,X-ray diffraction,electron backscatter diffraction and transmission electron microscopy.Different gradient hierarchical microstructures(gradients inα″martensite andβphase,and hierarchical twins range from the nanoscale to microscale)can be fabricated by RASP via changing the shot peening time.The hardening behavior and tensile mechanical properties of gradient hierarchical microstructure were systematically explored.Novel deformation twinning systems of{112}α″and{130}<310>α″in the kinkedα″martensite were revealed during the tensile deformation.It was found that stress-induced martensitic transformation,twinnedα″martensite and the related dynamic grain refinement contribute to hardness and work hardening ability.Simultaneous improvement of strength and ductility of the metastableα″titanium alloy can be achieved by introducing a gradient hierarchical microstructure. 关 键 词：Titanium alloys Gradient hierarchical microstructure α″martensite Rotationally accelerated shot peening Mechanical behavior
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