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采用等温压缩试验,在变形温度为600～1050℃、应变速率为0.002～0.2s-1的条件下,研究了粉末冶金Ti-47.5Al-2.5V-1.0Cr合金的高温压缩性能与高温变形行为.结果表明:合金在高温压缩变形时,屈服强度随变形温度的升高、应变速率的降低而降低,塑性趋于升高.合金在高温塑性变形时,峰值流变应力、应变速率和变形温度之间较好地满足双曲正弦函数形式修正的Arrhenius关系,说明其变形受热激活控制.在800～1050℃/0.002～0.2s-1范围内,合金应变敏感系数m为0.152,高温变形激活能Q为376kJ.mol-1.
The isothermal compression tests were carried out to study the high-temperature compression behavior and high-temperature deformation behavior of Ti-47.5Al-2.5V-1.0Cr powder metallurgy under deformation temperature of 600 ~ 1050 ℃ and strain rate of 0.002 ~ 0.2s-1 The results show that the yield strength decreases as the deformation temperature increases and the strain rate decreases, and the plasticity tends to increase when the alloy is deformed at high temperature.When the alloy is subjected to high temperature plastic deformation, the peak flow stress, strain rate and deformation temperature Arrhenius relationship of modified hyperbolic sine function is well satisfied, indicating that the deformation is controlled by thermal activation.The strain sensitivity coefficient m of alloy is 0.152 in the range of 800 ~ 1050 ℃ / 0.002 ~ 0.2s-1, and the deformation activation energy at high temperature Q is 376 kJ.mol-1.