论文部分内容阅读
采用扫描电镜(SEM)、X射线衍射(XRD)、透射电镜(TEM)、纳米压痕等分析测试手段,研究不同固溶温度对Ti55531钛合金微观组织和力学性能的影响。结果表明,合金的锻态组织由球状α相和β相组成,经过780℃和840℃固溶处理和540℃时效1 h后,合金的显微组织由初生α相、次生针状α相和β相组成,其中次生α相和β相存在位向关系,即(1101)α//(110)β;随着固溶温度增高,初生球状α相急剧减少,析出次生α相增多,而且次生针状α相硬度明显高于初生α相和基体β相,经780℃和840℃固溶处理后合金的硬度相对于锻态组织分别提高了8.5%和10.3%。
The effects of solution temperature on the microstructure and mechanical properties of Ti55531 titanium alloy were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and nanoindentation. The results show that the microstructure of the alloy is composed of α-phase and β-phase. After 780 ℃ and 840 ℃ solution treatment and aging at 540 ℃ for 1 h, the microstructure of the alloy consists of primary α phase, secondary acicular α phase And β phase, in which the secondary α phase and β phase have the orientation relationship, that is, (1101) α // (110) β. With the increase of solution temperature, the primary spherical α phase decreases sharply and the secondary α phase increases , And the secondary acicular α-phase hardness was significantly higher than that of the primary α phase and the matrix β phase. The hardness of the alloy after the solution treatment at 780 ℃ and 840 ℃ increased by 8.5% and 10.3% respectively.