置氢TC4钛合金室温变形行为研究

Investigations on Room Temperature Deformation Behaviors of Hydrogenated TC4 Alloys

通过压缩试验研究了置氢TC4合金的室温变形行为,采用OM、TEM、XRD等分析手段研究了氢处理对TC4钛合金室温组织和变形机制的影响。结果表明,氢作为β相稳定化元素,改善了TC4钛合金淬火的亚稳相结构,促进了斜方α″马氏体和体心β相的生成。氢含量0.45%(质量分数,下同)时,合金中以α″相为主,变形方式为孪晶变形,变形能力提高幅度较小;氢含量超过0.59%时,合金中保留了大量β相,变形方式以滑移为主,变形极限大大提高。

The room temperature deformation behavior of hydrogenated TC4 alloys was studied through compression tests. The hydrogen treatment on the microstructure and deformation mechanism of the TC4 alloy at room temperature was studied by OM, TEM and XRD. Results show that hydrogen, as β stabilized element, modified the metastable phase composition of as-quenched alloys, promoted the generation of orthorhombic martensite a＂ and body-centered β phase. When the H content was 0.45% （mass fraction, similarly hereinafter）, the alloy mainly consisted of a＂ phase, and the deformation behavior was twinning, which improved the deformation limit in a small range; while when the H content was higher than 0.59%, there were much β phase, and the deformation behavior was slipping, which improved the deformation limit greatly.