Microstructure refinement and enhanced wear-resistance modulated by stress relaxation processing in a metastable β titanium alloy

被引：17
作者：
Hua, Ke [1 ,2 ]
Zhang, Yongliang [1 ,2 ]
Zhang, Fan [1 ,2 ]
Kou, Hongchao [1 ]
Li, Xiaolin [1 ,2 ]
Wu, Hongxing [1 ,2 ]
Wang, Haifeng [1 ,2 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[2] Northwestern Polytech Univ, Ctr Adv Lubricat & Seal Mat, Xian 710072, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2021年 / 181卷
基金：
中国国家自然科学基金;
关键词：
Metastable beta titanium alloy; Stress relaxation processing; Microstructure evolution; Wear reduction; PHASE-TRANSFORMATION; FRETTING FATIGUE; DEFORMATION; ALPHA; TI-6AL-4V; BEHAVIOR; RECRYSTALLIZATION; SPHEROIDIZATION; ORIENTATION; SIMULATION;
D O I：
10.1016/j.matchar.2021.111505
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Hot deformation is an important procedure of metastable beta titanium alloy for manufacturing. And it is essential to improve the homogeneity of deformation microstructure in titanium alloy. In this work, the stress relaxation processing accompanied by hot compression in a metastable beta titanium alloy is designed to resolve the related mechanisms of stress relaxation by examining the microstructure evolution and improve the wear-resistance. The results demonstrated that the stress relaxation processing leads to the modification and evolution in morphology, size, and volume fraction of alpha precipitates. The alpha precipitates distribute randomly in beta matrix in a fine and equiaxed shape after stress relaxation. The elimination of deformation bands and formation of sub-grains are the mediated mechanism in the beta phase during stress relaxation. The stress relaxation makes a significant contri-bution to reduce the wear loss and improve the microstructure stability during friction. The lower wear loss can be attributed to the formation of fine beta sub-grains and the dispersed crystallographic orientations of alpha pre-cipitates. This work provides an effective method to microstructure refinement and a valuable solution to enhance the wear-resistance by tailoring the microstructural features.
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页数：10
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