固溶温度对TA10钛合金组织与力学性能的影响

选取TA10钛合金棒材,对其不同温度的固溶处理,随后使用光学显微镜、维氏硬度测试、拉伸性能测试研究其组织与力学性能的关系,结果表明,合金经固溶处理后,初生α相含量明显减少,β转变组织含量增加,析出大量次生α’相,随着固溶温度不断升高,初生α相含量逐渐减少,温度到单向区后,初生α相完全消失;随着固溶温度的升高,维氏硬度值不断增加,经单向区热处理后的硬度高于两相区,在固溶温度为920℃时,其硬度值达到最大值240 HV;随着固溶温度的升高,合金抗拉强度和屈服强度皆不断升高,而合金的塑形方面,其断后延伸率随着固溶温度的升高而降低。当固溶温度为920℃时,合金强度达到最大值,其中抗拉强度为548 MPa、屈服强度为420 MPa,当固溶温度为860℃时,合金塑形达到最大值,其中断后延伸率为23%。

TA10 titanium alloy bar was treated with solid solution at different temperatures, and then the relationship between microstructure and mechanical properties was studied by optical microscope, Vickers hardness test and tensile property test. The results show that after solution treatment, the content of primary α phase decreases obviously, the content of β transformation structure increases, and a large amount of secondary α′phase precipitates. With the increase of solution temperature, the content of primary α phase decreases gradually. When the temperature reaches the unidirectional region,the primary α phase disappears completely. The Vickers hardness(VH) increases with the increase of solution temperature.The hardness after heat treatment in unidirectional zone is higher than that in two-phase zone. When the solution temperature is 920 ℃, the hardness reaches the maximum of 240 HV;the tensile strength and yield strength of the alloy increase with the increase of solution temperature, while the elongation at break decreases with the increase of solution temperature. When the solution temperature is 920 ℃, the strength of the alloy reaches the maximum, in which the tensile strength is 548 MPa and the yield strength is 420 MPa. When the solution temperature is 860 ℃, the shape of the alloy reaches the maximum, and the elongation after fracture is 23%.