固溶温度对Ti-4Al-6Mo-2V-5Cr-2Zr钛合金的组织和拉伸性能的影响

研究了固溶温度对一种亚稳β钛合金(Ti-4Al-6Mo-2V-5Cr-2Zr)的锻态组织和室温拉伸性能的影响。结果表明，固溶温度低于相变点时大量的α相在β基体中析出并聚集在滑移带附近，随着固溶温度接近相变点α相的数量减少且部分滑移带消失。固溶温度高于相变点时显微组织为单一的β相且滑移带完全消失，随着固溶温度继续升高β晶粒聚集且长大。这种合金经750℃×1 h固溶处理后达到良好的强度塑性匹配，气抗拉强度、屈服强度和伸长率分别为957 MPa、887 MPa和11.7%。

Effect of Solution Treatment Temperature on Microstructure and Tensile Properties of Ti-4Al-6Mo-2V-5Cr-2Zr Alloy

A novel metastable β-Ti alloy (Ti-4Al-6Mo-2V-5Cr-2Zr) was designed, melt and wrought to prepare plates. Then the effect of solution treatment temperature on the microstructure and room temperature tensile properties of the as wrought alloy was investigated. Results show that a large number of α-phase precipitates from the β-matrix and gathers near slip bands when the solution temperature is lower than the phase transition temperature of the alloy. As the solution temperature approaches the phase transition temperature, the quantity of α-phase decreases and a part of the slip bands disappears. When the solution temperature is above the phase transition temperature, the alloy microstructure is composed fully of β-phase, while the slip bands disappear completely. As the solution temperature continues to rise, β-phase grains tend to aggregate and grow up. The alloy presents a good matching of strength and plasticity after solution treatment at 750℃×1 h. The corresponding ultimate tensile strength, yield strength and elongation are 957 MPa, 887 MPa and 11.7%, respectively.