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通过动力学模型分析、光学显微镜(OM)和X射线衍射(XRD)研究TC21钛合金的吸氢特性和组织演变规律。结果表明:根据吸氢动力学,发生在TC21钛合金吸氢过程中的反应可分为两个阶段。氢化后,TC21钛合金的显微组织变化明显。仅少量氢就会改变β转变相的对比度。当氢含量超过0.5%(质量分数)时,α相的对比度变暗。当氢含量达到0.625%时,相界/晶界变得模糊甚至消失,并且β相代替α相成为主要相。当氢含量达到1.065%时,α相消失。此外,XRD分析表明,氢化后的合金中出现了α’马氏体和FCCδ氢化物。根据组织和XRD分析,创建了TC21钛合金氢扩散过程的示意图。
The hydrogen absorption properties and microstructure evolution of TC21 titanium alloy were studied by dynamic model analysis, optical microscope (OM) and X-ray diffraction (XRD). The results show that according to the kinetics of hydrogen absorption, the reaction occurring in the hydrogen absorption of TC21 titanium alloy can be divided into two stages. Hydrogenation, TC21 titanium alloy microstructure changes significantly. Only a small amount of hydrogen changes the contrast of the beta-transforming phase. When the hydrogen content exceeds 0.5% (mass fraction), the contrast of α phase becomes dark. When the hydrogen content reaches 0.625%, the phase boundary / grain boundary becomes blurred or even disappear, and β phase instead of α phase becomes the main phase. When the hydrogen content reaches 1.065%, α phase disappears. In addition, XRD analysis showed that α ’martensite and FCC δ hydride appeared in the hydrogenated alloy. Based on the organization and XRD analysis, a schematic diagram of hydrogen diffusion process for TC21 titanium alloy was created.