TEM investigations on hydrogen induced phase transformation in Ti-6Al-4V alloys

Zhonggang SUN 1), Guoqing CHEN 1), Xuesong FU 1), Yaoqi WANG 2), Hongliang HOU 2) and Wenlong ZHOU 1) 1) School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China 2) Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China

摘 要：The TEM and HRTEM were utilized to investigate the phase transformation of hydrogenated Ti-6Al-4V alloys （0 wt pct-0.9 wt pct H） treated by annealing and quenching from β field. The results indicate that the orthorhombic α martensite and β phase appear progressively with the increase of hydrogen concentration. On the other hand, hydrides with sizes of 2-5 nm are observed in the specimens containing more than 0.6 wt pct hydrogen. The formation of α and twins can be attributed to the internal stress caused by solid solution of hydrogen and hydrides precipitation.

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