Effect of Heat Treatment on the Microstructure and Mechanical Properties of High-Strength Ti-6Al-4V-5Fe Alloy

被引：8
作者：
Wang, Zhenyu [1 ]
Liu, Libin [1 ,2 ]
Zhang, Ligang [1 ,3 ]
Sheng, Jinwen [1 ]
Wu, Di [1 ]
Yuan, Miwen [1 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, 932 South Lushan Rd, Changsha 410083, Peoples R China
[2] Minist Educ, Key Lab Nonferrous Metall Mat Sci & Engn, 932 South Lushan Rd, Changsha 410083, Peoples R China
[3] TU Bergakad Freiberg, ZIK Virtuhcon, Fuchsmuhlenweg 9, D-09596 Freiberg, Germany
来源：
MATERIALS TRANSACTIONS | 2019年 / 60卷 / 02期
基金：
中国国家自然科学基金; 国家科技攻关计划;
关键词：
Ti-6Al-4V-5Fe; microstructures; properties; alpha(p) phase; morphology; fracture surface; BETA-TITANIUM ALLOY; PRECIPITATE-FREE ZONES; TENSILE PROPERTIES; BEHAVIOR; DEFORMATION; NUCLEATION; TRANSFORMATION; FATIGUE; PHASE;
D O I：
10.2320/matertrans.M2018267
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of heat treatment on the microstructure characteristics and mechanical properties of the high-strength and low-cost Ti-6Al-4V-5Fe alloy was investigated. Two-phase (alpha + beta) and single-phase (beta) solution treatments and aging were applied to determine the relationship between microstructures and properties. The size of the grain after treatment of the solution in the beta single phase was only dozens of micron for the primary alpha(alpha(p)), which exhibited an obvious pinning effect on grain growth. The morphology and volume fraction of alpha(p) phase were highly sensitive to the heat treatment temperature and remarkably influenced the properties of the alloy. When the solution temperature was 780 degrees C and the aging temperature was 550 degrees C, the largest proportion (40%) of the globular alpha(p) phase and small secondary alpha(alpha(s)) phases resulted in the best performance of the alloy, with an ultimate strength of up to 1300 MPa and 9.57% elongation. The fracture surface of tensile specimens was systematically studied, showing a ductile mode of tensile failure after the sample was treated below 800 degrees C and then aged. However, it exhibited a brittle mode when the alloy is treated above 800 degrees C.
引用
收藏
页码：269 / 276
页数：8
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