Effect of substrate preheating on the texture, phase and nanohardness of a Ti-45Al-2Cr-5Nb alloy processed by selective laser melting

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• 作者：Wei Li ; Jie Liu ; Yan Zhou ; Shifeng Wen ; Qingsong Wei ; ^{wqs_xn@163.com" class="auth_mail" title="E-mail the corresponding author} ; Chunze Yan ; ^{c_yan@hust.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yusheng Shi
• 关键词：Selective laser melting ; Ti&ndash ; 45Al&ndash ; 2Cr&ndash ; 5Nb alloy ; Texture ; Phase ; Nanohardness
• 刊名：Scripta Materialia
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：118
• 期：Complete
• 页码：13-18
• 全文大小：1719 K

文摘

The crystallographic texture, phase composition and evolution, and nanohardness of a Ti–45Al–2Cr–5Nb alloy processed by selective laser melting (SLM) at various substrate preheating temperatures were investigated. The α₂ phase decreases whereas the γ and B₂ phases increase with increasing preheating temperature, and the relationship in orientation between B₂, α₂ and γ phases is described as follows: lineImage" height="22" width="164" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S1359646216300665-si1.gif">$\left(11\bar{2}0\right){\alpha }_2//\left(111\right)\gamma //\left(111\right)B_2$. The SLM-processed TiAl alloy shows much higher nanohardness than its traditional casting counterpart, which increases with the increase of preheating temperature. The findings would be a valuable reference for fabricating TiAl components with acceptable texture, phase compositions and nanohardness by SLM.