材料工程2017，Vol.45Issue(5)：80-85,6.DOI:10.11868/j.issn.1001-4381.2015.001562
TC18钛合金的超塑性行为与变形机制
Superplastic Behavior and Deformation Mechanism of TC18 Titanium Alloy
刁仲驰 1姚泽坤 2申景园 1刘瑞 2郭鸿镇1
作者信息
- 1. 西北工业大学材料学院,西安710072
- 2. 难变形材料锻造技术研究应用中心,西安710072
- 折叠
摘要
Abstract
Superplastic tensile behavior and deformation mechanism of TC18 titanium alloy were investigated by high temperature tensile test at 720-950 ℃ with initial strain rates of 6.7 × 10-5 s-1-3.3 ×10-1 s-1.The results show that under the optimal superplastic deformation condition (890 ℃ and 3.3 ×10-4 s 1),the maximum elongation is 470 ％,the peak stress is 17.93MPa and with uniform grain size.Below the phase transus Tβ,the elongation firstly increases and then decreases.A maximum elongation of 373 ％ is obtained at 830 ℃ and with initial strain rate of 3.3 × 10-4s-1 and the peak stress is 31.45MPa.The superplastic deformation mechanism of the TC18 titanium alloy in two-phase region is mainly grain rotation and boundary sliding,and the deformation coordination mechanism is dislocation slipping and climbing;the superplastic deformation mechanism in single phase region is intragranular dislocation motion and the deformation coordination mechanism is dynamic recovery and dynamic recrystallization.关键词
TC18钛合金/超塑性/显微组织/变形机制Key words
TC18 titanium alloy/superplasticity/microstructure/deformation mechanism分类
矿业与冶金引用本文复制引用
刁仲驰,姚泽坤,申景园,刘瑞,郭鸿镇..TC18钛合金的超塑性行为与变形机制[J].材料工程,2017,45(5):80-85,6.
