TiB2/Al复合材料高温拉伸材料常数的研究

Research on material constant values of TiB_2/Al during elevated temperature tensile test

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。

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 - 1 s-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 ae and Z parameter. The values of A , a and n in the analytical expressions of flow stress σp are fitted to be 605.5 × 10^12 s-1 , 0. 027 MPa-1 and 10. 018. The hot deformation activation energy in Z parameter expression is 256.78 kJ ·mol^-1