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摘要：
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在变形温度为350～500℃、应变速率为0.0001～1 s-1变形条件下对原位合成TiB2(质量分数8%)/6351Al复合材料进行了高温拉伸实验,并采用双曲正弦模型,确定了复合材料的常数。结果表明:流变应力峰值σP与Z参数之间能较好地满足双曲正弦关系,得到流变应力峰值σP解析表达式中常数A,α和n值分别为605.5×1012s-1,0.027MPa-1和10.018,Z参数中的激活能Q值为256.78kJ·mol-1。
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The elevated temperature tensile test of in-situ TiB2(mass fraction is 8%)/6351 Al composites was carried out in the range of deformation temperature 350-500℃and strain rate 0.0001-1s-1. The material constant values were studied using a hyperbolic sine model. The results show that the hyperbolic sine can satisfactorily describe the correlation between flow stress σP and Z parameter. The values of A , α and n in the analytical expressions of flow stress σP are fitted to be 605.5×1012 s-1,0.027MPa-1 and 10.018. The hot deformation activation energy in Z parameter expression is 256.78kJ·mol-1.
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