Hydrogen absorption characteristics and microstructural evolution of TC21 titanium alloy

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• 作者：Bao-guo YUAN ; ^{yuanbaoguo@163.com" class="auth_mail" title="E-mail the corresponding author} ; Yu-bin ZHENG ; Yu-jie WANG ; Long-qing GONG
• 关键词：TC21 titanium alloy ; hydrogen absorption characteristics ; kinetics ; microstructure ; diffusion
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：26
• 期：2
• 页码：599-606
• 全文大小：5935 K

文摘

The hydrogen absorption characteristics and microstructural evolution of TC21 titanium alloy were investigated by kinetic model analysis, optical microscopy (OM) and X-ray diffraction (XRD). The results show that the hydrogen absorption reaction occurred during the hydrogen absorption process of TC21 titanium alloy can be divided into two different stages according to the hydrogen absorption kinetics. After hydrogenation, the microstructure of TC21 titanium alloy changes obviously. Just a little hydrogen will change the contrast of transformed β phase. The contrast of α phase darkens when the hydrogen content in TC21 titanium alloy exceeds 0.5% (mass fraction). The phase/grain boundaries become ambiguous or even vanished, and β phase becomes the main phase instead of α phase when the hydrogen content reaches 0.625%. Moreover, α phase disappears when the hydrogen content reaches 1.065%. Additionally, the XRD analysis shows that α′ martensite and FCC δ hydride appear in the hydrogenated alloy. According to the microstructures and XRD analysis, the schematic diagrams of hydrogen diffusion process in TC21 titanium alloy were established.