Structural Stability and Stacking Fault Energies in β Ti-Nb Alloys: An Ab Initio Study

摘要：

The structural stability and stacking fault energies of the 112<111> and 110<lll> slip sy stems in the β Ti-Nb alloys with various valence electron numbers were surveyed by ab initio calculations. The results show that the structural stability and unstable stacking fault energies along these slip systems decrease with reducing the valence electron number in the β Ti-Nb alloys. The ratios ofγ(b/3) to 2γ (b/6) in 110 increase with decreasing the valence electron number in the β Ti-Nb alloys. For the β Ti-Nb alloys with lower stacking fault energy and higher ratio ofγ(b/3) to 2γ(b/6) in 110increase with decreasing the valence electron number in the β Ti-Nb alloys. For the β Ti-Nb alloys with lower stacking fault energy and higher ratio of γ(b/3) to 2γ(b/6) in 110 ,the screw dislocations of 1/2111 split into six partial dislocations of a/12lll more easily, which spreading more extensively in the (1-10),(10-1),(01-1),(11-2),(1-21) and (-211) planes,respectively.

关键词： β Ti-Nb alloys structural stability stacking fault energy dislocation core

作者: J. Huang J. Sun Y. F. Wen H. Xing

作者单位: School of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200240 ,PR 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: 1328-1331

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）