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雷晓飞,董利民,张志强,胡明,李炎州,杨锐.固溶和时效温度对TC6钛合金显微组织与力学性能的影响[J].稀有金属材料与工程(英文),2020,49(3):1038~1044.[Lei Xiaofei,Dong Limin,Zhang Zhiqiang,Hu Ming,Li Yanzhou and Yang Rui.Effects of Solution-Treatment and Aging Temperature on Microstructure and Mechanical Properties of TC6 Titanium Alloy[J].Rare Metal Materials and Engineering,2020,49(3):1038~1044.]
Effects of Solution-Treatment and Aging Temperature on Microstructure and Mechanical Properties of TC6 Titanium Alloy
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Received:January 10, 2019  Revised:July 20, 2019
DOI:
Key words: TC6 titanium alloy  solution treatment and aging  microstructure  mechanical properties
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Lei Xiaofei,Dong Limin,Zhang Zhiqiang,Hu Ming,Li Yanzhou and Yang Rui  
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Abstract:
      In this study, effects of solution-treatment and aging temperature on microstructure and mechanical properties of TC6 titanium alloy were investigated. The results show that when specimens were solution-treated at 800~840 oC, primary α and metastable β phases formed and they grew up with increasing temperature, which resulted in the slight increases in strength and ductility. The metastable β phase was also retained after solution-treatment at 880 oC though its stability was weakened, while at this moment double yield phenomenon was observed, which was attributed to stress-induced α″ orthorhombic martensite in the metastable β phase. When specimens were solution-treated at 920~960 oC, the strength increased and the ductility decreased in that primary α phase dissolved and a large amount of fine acicular α″ orthorhombic martensite precipitated from the metastable β phase. The alloy was almost composed of coarse α¢ hexagonal martensite after solution treatment above the β transus, which led to the decrease in strength and the brittle fracture during tensile test. In terms of different aging temperatures for solution-treated specimens (880 oC/1.5 h/WQ), the main microstructural changes were the precipitation of secondary α phase from the metastable β phase and its growth. Compared with solution-treated specimens, the specimens aged at 300 oC exhibited higher strength and lower ductility, and it can be seen that some secondary α phase and ω phase had precipitated from the β matrix. As the aging temperature increased to 400 oC, the maximum strength as well as minimum ductility was obtained. The specimens aged at 500 oC maintained the maximum strength, while the ductility was improved due to the sufficient diffusion of alloying elements. When the specimens were aged at 550 oC, these possessed the optimum balance of strength and ductility. The primary α phase gradually gathered to grow up and the lamellar secondary α phase apparently dispersed in the β matrix after aging at 600~700 oC, which led to the decrease in strength and the increase in ductility.