Enhanced strength-ductility synergy in Ti55531 titanium alloys through gradient microstructural design strategy

被引：2
作者：
Tan, Changsheng [1 ,2 ]
Yang, Tao [1 ]
Huang, Chaowen [3 ]
Zhang, Jiachen [1 ]
Wang, Xueliang [4 ]
Lu, Hengping [2 ]
Wen, Linxian [2 ]
Zhang, Guojun [1 ]
机构：
[1] Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Shaanxi, Peoples R China
[2] Yang Zhou Pipe Fitting Factory Co Ltd, Yangzhou 225800, Jiangsu, Peoples R China
[3] Guizhou Univ, Natl & Local Joint Engn Lab High Performance Met S, Guiyang 550025, Peoples R China
[4] Xi An Jiao Tong Univ, Xian 710049, Shaanxi, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2024年 / 909卷
基金：
中国国家自然科学基金;
关键词：
Ti55531; alloy; Axial gradient microstructures; Strength-ductility synergy; TWIP effect; Crack initiation; DEFORMATION; BEHAVIOR; RESISTANCE; SLIP; BETA;
D O I：
10.1016/j.msea.2024.146823
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The strength-ductility trade-off dilemma still exists for titanium alloys, which is a challenging and pressing issue within the realm of microstructure design and property control. In the present work, a typical axial gradient microstructure was prepared in Ti55531 titanium alloy through a composite strengthening process involving rapid electropulsing treatment (EPT) combined with step-quench treatment (SQT). The results show that a significant improvement of 450 MPa (54 %) and 6.3 % (100 %) for the strength and ductility are obtained respectively for gradient microstructure by EPT + SQT (GMES) compared to that gradient microstructure prepared by EPT (GME) only. This indicates that the enhanced strength-ductility synergy observed in GMES is attributed to the characteristic Twinning induced Plasticity (TWIP) mechanism employed in this novel design of gradient microstructure. Furthermore, a detailed analysis and discussion are provided on the physical deformation mechanism and crack initiation behaviour of the gradient microstructure, providing valuable insights for the design of high-strength, high-ductility metals such as beta titanium alloys, advanced steels, and multi-phase alloys.
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页数：11
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