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对片层组织的新型钛合金(Ti-6Al-4V-4Zr-Mo)进行时效处理,通过改变时效温度控制其微观组织细节特征,对具有不同组织特征的试样进行微观组织观察、力学性能测试以及断口分析,研究了片层组织细节特征对Ti-6Al-4V-4Zr-Mo合金准静态拉伸性能和动态压缩性能的影响。结果表明:对β固溶处理后的Ti-6Al-4V-4Zr-Mo合金进行后续时效处理,随着时效温度的降低,网篮结构排列更为密集,α集束尺寸、α片层厚度以及β组织基体上析出的针状次生α相的尺寸均明显减小;随着时效温度的降低,片层组织的准静态、动态塑性均增加;经570℃时效处理后得到的网篮组织,α集束尺寸以及集束中α片层尺寸较小,且β组织基体上有许多细小的针状次生α片层析出,使得位错的滑移距离减小同时使得裂纹扩展路径更曲折,在维持一定静、动态强度的同时,其静、动态塑性明显改善,表现出良好的综合力学性能。
A new type of titanium alloy (Ti-6Al-4V-4Zr-Mo) with a lamellar structure was aged. The microstructural characteristics of Ti-6Al-4V-4Zr-Mo were controlled by changing the aging temperature. Microstructure observation, mechanical property test And fracture analysis, the effect of lamellar microstructure on the quasi-static tensile properties and dynamic compressive properties of Ti-6Al-4V-4Zr-Mo alloy was studied. The results show that the structure of the baskets is more dense with the subsequent aging treatment of the Ti-6Al-4V-4Zr-Mo alloy after β-solution treatment. With the decrease of the aging temperature, the size of the α-bundle, the thickness of α- The size of the acicular secondary α phase precipitated on the matrix decreased obviously. With the decrease of the aging temperature, the quasi-static and dynamic plasticity of the lamellar structure increased. After being aged at 570 ℃, the α The size of the bundles and the size of the α-sheet in the bundle are small, and many fine needle-shaped secondary α-sheets are precipitated on the β-matrix. The slip distance of the dislocations is reduced and the crack propagation path is more tortuous. A certain static and dynamic strength, while its static and dynamic plastic significantly improved, showing good overall mechanical properties.