Toughening effects of Mo and Nb addition on impact toughness and crack resistance of titanium alloys

被引：83
作者：
Huang, Shixing [1 ]
Zhao, Qinyang [2 ]
Zhao, Yongqing [3 ]
Lin, Cheng [4 ]
Wu, Cong [3 ]
Jia, Weiju [3 ]
Mao, Chengliang [3 ]
Ji, Vincent [5 ]
机构：
[1] Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Liaoning, Peoples R China
[2] Changan Univ, Sch Mat Sci & Engn, Xian 710064, Shaanxi, Peoples R China
[3] Northwest Inst Nonferrous Met Res, Xian 710016, Shaanxi, Peoples R China
[4] Liaoning Shihua Univ, Sch Mech Engn, Fushun 113001, Liaoning, Peoples R China
[5] Univ Paris Saclay, UMR CNRS 8182, ICMMO SP2M, F-91405 Orsay, France
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2021年 / 79卷
关键词：
Titanium alloy; Impact toughness; Crack resistance; Dislocation mobility; Deformation twinning; ACTIVE DEFORMATION SYSTEMS; ATHERMAL OMEGA PHASE; PURE TITANIUM; CRYSTAL-PLASTICITY; FRACTURE-BEHAVIOR; ALPHA-TITANIUM; SLIP; MECHANISMS; TRANSITIONS; TEMPERATURE;
D O I：
10.1016/j.jmst.2020.11.045
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ti-6Al, Ti-6Al-2Mo and Ti-6Al-3Nb alloys were prepared to investigate the toughening effects of beta stabilizers Mo and Nb on impact toughness and crack resistance of titanium alloys. Instrumented Charpy impact tests showed that the total impact absorbed energy of Ti-6Al-2Mo and Ti-6Al-3Nb (similar to 64 J) were two times higher than that of Ti-6Al (similar to 30 J), indicating the higher impact toughness of Ti-6Al-2Mo and Ti-6Al-3Nb alloys. Analysis of load-displacement curves revealed the similar crack initiation energy of Ti-6Al, Ti-6Al-2Mo and Ti-6Al-3Nb (15.4 J, 16.1 J and 15.0 J, respectively). However, the higher crack propagation energy of Ti-6Al-2Mo and Ti-6Al-3Nb (46.7 J and 48.3 J, respectively) were about three times higher than that of Ti-6Al (14.4 J), indicating the stronger resistance to crack propagation in Ti-6Al-2Mo and Ti-6Al-3Nb. Post-mortem analysis of impact samples demonstrated that the increased dislocation density and deformation twinning were mainly responsible for the stronger resistance to crack propagation in Ti-6Al-2Mo and Ti-6Al-3Nb. Due to the invisibility of dislocation activation and deformation twinning during the Charpy impact process, a mathematical model has been proposed to evaluate the effects of Al, Mo and Nb elements on dislocation mobility based on the Yu Rui-huang electron theory. Addition of Mo and Nb elements significantly improved the dislocation mobility in Ti-6Al-2Mo and Ti-6Al-3Nb compared to that in Ti-6Al alloy. Therefore, more dislocations were activated in Ti-6Al-2Mo and Ti-6Al-3Nb which supplied the larger plastic deformation under impact loading. A dislocation-based model also has been proposed to interpret the nucleation and propagation of deformation twinning under the impact loading. Dislocation pileup at alpha/beta interfaces provided potential sites for nucleation of deformation twinning in Ti-6Al-2Mo and Ti-6Al-3Nb. Furthermore, deformation twinning facilitated the dislocation motion in alpha grains with hard orientations. The increased dislocation mobility and deformation twinning were responsible for the stronger crack resistance as well as the higher impact toughness of Ti-6Al-2Mo and Ti-6Al-3Nb alloys. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
引用
收藏
页码：147 / 164
页数：18
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