Evolution of microstructure and intervariant boundaries ofαphase in electron beam melted and heat-treated Ti-6Al-4V alloy

作     者：Ming Wang Hao-Qing Li Hong Guo Liu Feng Shu-Yu Liu Xiao-Ying Fang Ming Wang;Hao-Qing Li;Hong Guo;Liu Feng;Shu-Yu Liu;Xiao-Ying Fang

作者机构：Institute for Advanced ManufacturingShandong University of TechnologyZibo255000China Center of Testing and AnalysisShandong University of TechnologyZibo255000China School of Mechanical EngineeringShandong University of TechnologyZibo255000China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2021年第40卷第8期

页      面：2118-2126页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the Key R&D Plan of the Ministry of Science and Technology(No.2018YFB1105900) the Shandong Province Key R&D Project(No.2018GGX103017) the Zibo City and SDUT Integration Project(No.2018ZBXC154) 

主　　题：Intervariant boundaries Electron beam melting Ti-6Al-4V alloy Heat treatment 

摘      要：It is important to understand the correlation between grain morphology and intervariant boundaries of theαphase after heat treatment belowβtransus of the electron beam melted(EBMed)Ti-6 Al-4 V *** electron microscopy(SEM)and electron backscatter diffraction(EBSD)analysis have shown about 99%αphase and 1%βphase in the heat-treated samples when the temperature rises to 950℃.Four distinct types ofαgrain morphology have been found:allotromorphousα,relatively coarseαplate,large precipitationαand granularα.A single peak of the intervariant boundary with the misorientation of 60°/[1120]associated with Burgers orientation relationship(OR)was found in the allotromorphousα*** intervariant boundaries mixed with a fraction of general high-angle grain boundary(GHABs,not Burgers OR)were present in the relatively coarseαplate *** only low-angle grain boundaries(LABs)with the misorientation of5°were found in the large precipitationαgrains.βphase tends to distribute around the boundaries of relatively coarseα*** suggests that different formation mechanisms are involved in the distinct types ofαgrain morphology.