对 Ti5Mo5V3Al-xCr（x ＝1．0，3．0，5．0，7．0，9．0）系五种合金分别在β单相区和（α＋β）两相区固溶水淬处理后，并在同一温度时效后的力学性能进行了研究。结果显示，合金的时效强度随着 Cr 含量的增加而逐渐降低。通过扫描电镜 SEM及 XRD 等分析测试手段，详细分析了五种合金在各种热处理状态下的相构成、相含量、尺寸形貌等微观因素与宏观力学性能之间的相关性。结果显示 Ti5Mo5V3Al-xCr 系合金的强化机制主要是由于时效过程中析出的αs 相造成的。合金强化效应的大小则与αs 相析出的数量、尺寸密切相关，而αs 相的析出机制主要由 Cr元素在合金系中的含量所决定。
Different Cr contents of Ti5Mo5V3Al-xCr (x = 1 .0,3.0,5.0,7.0,9.0)alloys were solution treated in βphase region (above the phase transition point 20℃)and α+βphase region (below the phase transition point 30℃).And then aging at the same temperature of 520℃.The mechanical properties results show that the aging strengthening capacity of alloys decreased with increasing Cr content.Scanning electron microscopic and X-ray diffraction were used to analyze the correlation between the micro factors (such as phase composition,phase content,phase size and phase morphology)and the macro mechanical properties in different heat treatment conditions.The results show that the aging strengthening mechanism of Ti5Mo5V3Al-xCr alloys is mainly caused by the precipitation ofαs phase in the process of aging.The aging strengthening capacity of alloys is closely related to the number of αs phase and the size ofαs phase.The precipitation mechanism of αs phase is mainly dominated by the content of Cr element in Ti5Mo5V3Al-xCr alloys.
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