Hydrogen absorption characteristics and microstructural evolution of TC21 titanium alloy  

TC21钛合金吸氢特性和组织演变规律（英文）

作　　者：袁宝国[1] 郑育彬[1] 王玉洁[1] 龚龙清[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《Transactions of Nonferrous Metals Society of China》2016年第2期599-606,共8页中国有色金属学报（英文版）

基　　金：Project(51205102)supported by the National Natural Science Foundation of China;Project(2012M511401)supported by the Postdoctoral Science Foundation of China

摘　　要：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 transformedβphase. The contrast ofα phase darkens when the hydrogen content in TC21 titanium alloy exceeds 0.5% （mass fraction）. The phase/grain boundaries become ambiguous or even vanished, andβ phase becomes the main phase instead ofα 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 FCCδ 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.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。

关 键 词：TC21 titanium alloy hydrogen absorption characteristics KINETICS MICROSTRUCTURE DIFFUSION 

分 类 号：TG146.23[一般工业技术—材料科学与工程]