The Effect of Oxygen on Mechanical Properties and Deformation Modes of Ti-2Al-xO Alloys at Different Temperatures

摘要：

Ti-2A1 alloys were prepared to contain oxygen from 0. 06 to 0. 3(wt pct) and effect of oxygen on the strength and ductility as well as deformation modes were investigated at 77K (in liquid nitrogen), room temperature(RT) and 673K. The results show that oxygen has apparent effect on properties of Ti-2Al-xO alloys at low temperature and RT and the effect became less at 673K. Oxygen from 0. 06 to 0. 3 in Ti2A1 alloys increases the strength from 650MPa to 1250MPa, increasing by 600MPa. At 673K,the strength increase from 230MPa to 380MPa with the same oxygen content changes. At low temperatures, ductility decreases with increasing oxygen. Increasing temperature weakens the effect of oxygen on ductility and Ti-2Al-xO alloys show almost same ductility independent of oxygen concentration. The results also show that load drop (stress drop) occurs which means yield in plastic deformation of alloys at 673K, while load drop disappears at RT and 77K. This indicates that dislocation can escape from oxygen atmosphere in the lattice at high temperature. Typical dislocation patterns, such as dislocation bundles and cells, form in Ti-2Al-0. 06O alloy and only dislocation lines are found in Ti-2Al-0. 30 alloys.

关键词： Effect of oxygen titanium alloy tensile properties deformation mode

作者: Qiaoyan Sun Yanling Xu Lin Xiao Jun Sun Peng Ge

作者单位: State Key Laboratory for Mechanical Behaviors of Materials ,Xian Jiaotong University ,Xian, 710049 State Key Laboratory for Mechanical Behaviors of Materials ,Xian Jiaotong University ,Xian, 710049 North-west Institute For Nonferrous Metal Research,Xian, 710016,Shaanxi,China

会议类型: 国际会议

会议名称: The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)

会议地点: 北京

会议语种:英文

页码: 1187-1190

在线出版日期: 2011-06-19（万方平台首次上网日期，不代表论文的发表时间）