研究了置氢0.11%的Ti-6Al-4V在800～900℃温度范围和3×10(-4)～1×10(-2)s(-1)应变速率范围内的超塑变形行为,应用光学显微镜研究了变形过程中的组织演变.结果表明:置入0.11%的氢能够显著改善Ti-6Al-4V超塑变形行为,峰值应力较原始合金降低了15～33 MPa,应变速率敏感性指数m值提高至0.497,变形激活能为322 kJ·mol(-1);在840～860 ℃温度范围和3×10(-3)～1×10(-3)s(-1)应变速率范围内,具有最佳超塑性,其延伸率最高达到1530%.0.11%的氢使α相及β相软化的同时促进了动态再结晶,提高了位错的攀移能力并且降低了位错密度;α和β两相比例未发生显著变化,适当的比例在变形过程中有利于两相相互抑制长大.置氢后超塑变形机制与未置氢相同,主要为界面的滑动和晶粒的转动,而位错的运动及动态再结晶为其协调机制.
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