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采用等温压缩试验研究不同原始组织对Ti-5Al-2Sn-2Zr-4Mo-4Cr合金流动应力、应变速率敏感性指数、应变硬化指数和表观变形激活能的影响。结果表明:原始组织为片层组织的Ti-5Al-2Sn-2Zr-4Mo-4Cr合金具有更高的峰值应力和流动软化效应,当变形温度高于或等于810°C、应变速率为0.1~5.0 s-1时,原始组织为等轴组织的Ti-5Al-2Sn-2Zr-4Mo-4Cr合金存在初始屈服现象。当应变为0.5~0.7、变形温度较低、应变速率为0.01 s-1时,原始组织为等轴组织的Ti-5Al-2Sn-2Zr-4Mo-4Cr合金的应变速率敏感性指数值较大,这主要归因于其显微组织演变特征。隋着变形的进行,原始组织为片层组织的Ti-5Al-2Sn-2Zr-4Mo-4Cr合金发生了α片层弯曲和动态球化现象,这使得其应变硬化指数变化显著。当应变为0.15~0.55时,原始组织为片层组织的Ti-5Al-2Sn-2Zr-4Mo-4Cr合金的表观变形激活能更大。
The isothermal compression test was used to study the influence of different original structures on the flow stress, strain rate sensitivity index, strain hardening index and apparent deformation activation energy of Ti-5Al-2Sn-2Zr-4Mo-4Cr alloy. The results show that the Ti-5Al-2Sn-2Zr-4Mo-4Cr alloy with lamellar structure has higher peak stress and flow softening effect. When the deformation temperature is higher than or equal to 810 ° C, the strain rate is 0.1-5.0 s-1, the initial structure of the Ti-5Al-2Sn-2Zr-4Mo-4Cr alloy equiaxed has an initial yield phenomenon. The strain rate sensitivity index of Ti-5Al-2Sn-2Zr-4Mo-4Cr alloy with equiaxed structure is larger when strain is 0.5-0.7, deformation temperature is lower and strain rate is 0.01 s-1. This is mainly due to its microstructure evolution characteristics. Sui deformation, the original organization of lamellar Ti-5Al-2Sn-2Zr-4Mo-4Cr alloy occurred α sheet bending and dynamic spheroidization, which makes the strain hardening index changes significantly. When strain is 0.15-0.55, the apparent deformation activation energy of Ti-5Al-2Sn-2Zr-4Mo-4Cr alloy with the original structure of lamellar structure is larger.