Impact toughness and deformation modes of Ti-6Al-4V alloy with different microstructures

被引：81
作者：
Lei, Lei [1 ,2 ]
Zhao, Yongqing [1 ,2 ]
Zhao, Qinyang [3 ]
Wu, Cong [2 ]
Huang, Shixing [2 ]
Jia, Weiju [2 ]
Zeng, Weidong [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[2] Northwest Inst Nonferrous Met Res, Xian 710016, Peoples R China
[3] Changan Univ, Sch Mat Sci & Engn, Xian 710064, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2021年 / 801卷 / 801期
关键词：
Ti-6Al-4V alloy; Impact toughness; Crack propagation; Deformation mode; CRACK RESISTANCE; TITANIUM-ALLOY; ALPHA-PHASE; STRAIN; BETA; ORIENTATION; FRACTURE; FATIGUE; WIDMANSTATTEN; MECHANISMS;
D O I：
10.1016/j.msea.2020.140411
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The impact toughness and deformation modes of Ti-6Al-4V alloy with different microstructures, i.e., equiaxed microstructure (EM), bimodal microstructure (BM), fine lamellar microstructure (LM1) and coarse lamellar microstructure (LM2), were studied and revealed in detail. The impact toughness of BM was determined as 85 J/cm(2), which was about 70%, 42% and 35% higher than that of EM, LM1 and LM2, respectively. BM possesses a composite-like microstructure containing hard primary alpha grain (alpha(p)) and soft beta transformation microstructure (beta(t)). During crack propagation, large plastic deformation occurs within soft beta(t) region, and the deformation of beta(t) was constrained by surrounding hard alpha(p), resulting in kink deformation of beta(t) and local plastic deformation of alpha(p). In addition, {10-12} -1011 -10(11)-10(12) compression twins were activated, the impact toughness was still lower than that of BM due to little plastic deformation in LM1 and heterogeneous deformation in LM2. These results indicated that the coordinated deformation ability of the microstructure plays an important role in impact toughness of the alloy.
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页数：12
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