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采用冷等静压+真空烧结(CIP)法制备Ti6Al4V2Cr1.5Mo合金。对经不同的固溶温度(860~950℃)和时效温度(480~600℃)热处理后合金的组织和力学性能进行研究。结果表明:随固溶温度的升高,合金的强度、伸长率和硬度都呈先升高后降低的趋势,在920℃时都达到最大值;在920℃固溶时,随时效温度的升高,合金的强度、伸长率和硬度也随温度的升高先升高后降低,在520℃时达到最大值,且组织形态为双态组织,固溶时产生的次生α相在时效过程中分解产生弥散的α+β相能提高合金的强度和硬度,α相的含量能保证合金良好的塑性,使合金有较好综合力学性能。因此,Ti6Al4V2Cr1.5Mo合金的最佳热处理工艺为固溶920℃(WQ)+时效520℃(AC),此时强度、伸长率和硬度分别为1169.6 MPa、8.3%和621.7 HV0.1。
Ti6Al4V2Cr1.5Mo alloy was prepared by cold isostatic pressing and vacuum sintering (CIP). The microstructure and mechanical properties of the alloy after heat treatment at different solution temperature (860 ~ 950 ℃) and aging temperature (480 ~ 600 ℃) were studied. The results show that with the increase of solution temperature, the strength, elongation and hardness of the alloy first increase and then decrease, reaching the maximum at 920 ℃. At 920 ℃, The strength, elongation and hardness of the alloy first increased and then decreased with the increase of temperature, reached the maximum at 520 ℃, and the microstructure of the alloy was bimorphic. In the decomposition of α + β dispersed phase can improve the strength and hardness of the alloy, α-phase content to ensure good plasticity of the alloy, the alloy has better mechanical properties. Therefore, the optimum heat treatment process of Ti6Al4V2Cr1.5Mo alloy is solution temperature 920 ℃ (WQ) + aging 520 ℃ (AC), the strength, elongation and hardness are 1169.6 MPa, 8.3% and 621.7 HV0.1 respectively.