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

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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 alloy.Scanning 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 allotromorphousαcolony.Multiple intervariant boundaries mixed with a fraction of general high-angle grain boundary(GHABs,not Burgers OR)were present in the relatively coarseαplate colony.Almost only low-angle grain boundaries(LABs)with the misorientation of<5°were found in the large precipitationαgrains.βphase tends to distribute around the boundaries of relatively coarseαplates.It suggests that different formation mechanisms are involved in the distinct types ofαgrain morphology.
出处 《Rare Metals》 SCIE EI CAS CSCD 2021年第8期2118-2126,共9页 稀有金属(英文版)
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)。
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