Characterization of the prior particle boundaries in a powder metallurgy Ti2AlNb alloy
Zhang, Jinhu; Liu, Jinmin; Xu, Dongsheng; Wu, Jie; Xu, Lei; Yang, Rui
AbstractTi2AlNb-based alloy powder metallurgy (PM) compacts were prepared via hot isostatic pressing (HIP) under relatively low temperature (920 and 980 degrees C) and at certain pressure (130 MPa). The microstructure, composition and orientation of B2, alpha(2) and O phases in the compacts were characterized and analyzed with an aim to investigate the effect of unsuitable HIPping parameters on the appearance of prior particle boundary (PPB), which seriously affects the mechanical properties of the alloy. The results show that more alpha(2) phase is the characteristics of the PPB in Ti2AlNb-based alloy when HIPped at relatively low temperature. Increasing HIPping temperature to the upper part of the two-phase region can effectively inhibit the formation of PPB. Electron backscatter diffraction measurements show the specific orientation relationship between phases, which helps us understand the origin of alpha(2) and O phase and the corresponding transformation path. The HIPping at a higher temperature can weaken the micro-texture intensity of the alpha(2) and O phase due to the increase of misorientation in B2 phase. The alpha(2) phase at cell wall keeps the Burgers orientation relationship (BOR) with the grain on one side, and does not satisfy the BOR with the other. It is found that some O phase variants inside the cell HIPped at 980 degrees C can only maintain alpha(2)-O OR with alpha(2) owing to the alpha(2)-> O phase transformation forming the O phase, while these O variants deviate from alpha(2)-O OR with B2 phase. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordPowder metallurgy Titanium alloys Hot isostatic pressing Prior particle boundary (PPB) Microtexture Ti-22Al-24Nb-0.5Mo alloy
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WOS IDWOS:000497965900011
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Zhang, Jinhu,Liu, Jinmin,Xu, Dongsheng,et al. Characterization of the prior particle boundaries in a powder metallurgy Ti2AlNb alloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2019,35(11):2513-2525.
APA Zhang, Jinhu,Liu, Jinmin,Xu, Dongsheng,Wu, Jie,Xu, Lei,&Yang, Rui.(2019).Characterization of the prior particle boundaries in a powder metallurgy Ti2AlNb alloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,35(11),2513-2525.
MLA Zhang, Jinhu,et al."Characterization of the prior particle boundaries in a powder metallurgy Ti2AlNb alloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 35.11(2019):2513-2525.
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