通过光学显微镜、扫描电镜及拉伸性能测试等方式研究了固溶温度对一种新型亚稳β钛合金(Ti-3 Al-8 V-4 Mo-4Cr-4Zr-2Nb-2Fe)组织与拉伸性能的影响.结果表明,在660～720℃范围内,随着固溶温度的升高,实验合金组织中的初生α相数量减少,β基体尺寸增大,抗拉强度降低,塑性升高.合金经460℃低温时效处理后,组织中的次生α相以短棒状和长针状两种形态析出,前者在初生α相密集区析出,后者在β晶内析出.随着固溶温度的升高,次生α相的厚度增加,长宽比减小,致密度降低,形态由针状向短棒状转变,同时,初生α相的含量不断减少;当固溶温度升至740℃时,晶内已无初生α相析出.合金经720℃×30 min/AC+ 460℃×12 h/AC处理后,具有良好的强韧性匹配.720℃为该合金的最佳固溶温度.
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