Microstructure evolution of biphase TC21 alloy before and after hydrogenation as well as dehydrogenation was investigated by XRD, OM and TEM. The results show that the amount of β phase increases gradually as the hydrogen content increases; fcc δ hydrides appear when the hydrogen content reaches above 0.319%. Hydrides mainly precipitate by eutectoid transformation through diffusion during the cooling process after high-temperature hydrogenation. Because of the lattice distortion caused by eutectoid transformation, recrystallization occurs after the dehydrogenation, so the grains are refined and become much more homogenous.
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張學(xué)敏,趙永慶,曾衛(wèi)東.氫處理對TC21合金顯微組織的影響[J].稀有金屬材料與工程,2009,38(12):2179~2182.[Zhang Xuemin, Zhao Yongqing, Zeng Weidong. Effect of Hydrogenation on Microstructure of TC21 Alloy[J]. Rare Metal Materials and Engineering,2009,38(12):2179~2182.] DOI：[doi]