摘要
采用Gleeble-1500热模拟实验机对17％SiCp/2024Al(体积分数)复合材料在温度为573-773 K、应变速率为0.02-0.5 s-1变形条件下的热变形行为进行了研究.结果显示,复合材料的流变应力随变形温度的升高、应变速率的降低而降低,采用位错-颗粒交互作用模型能够合理的解释复合材料的应力-应变行为;采用Power-Arrhenius型速率方程 对复合材料的热变形激活能Q进行了计算,结果显示复合材料在不同的温度区间具有不同的激活能,其中在623-723 K的变形温度区间内,激活能为250 kJ·mol-1。
The hot deformation behavior of 17% SiCp/2024Al (volume fraction) alloy composite was investigated by using Gleeble 1500 dynamic testing machine at temperature range from 573 to 773 K and at strain rate range from 0.02 to 0.5 s(-1). The results indicate that the flow stress of the composite decreases with increasing deformation temperature and decreasing strain rate, which can be explained reasonably on the basis of the model of dislocation-particulate interactions during the hot deformation. The hot deformation activation energy of the composite calculated with the Power-Arrhenius function epsilon(over dot) = Asigma(1/m)exp(-Q/RT) is varied at different deformation temperatures and is of 250 kJ.mol(-1) at the temperature range from 623 to 723 K.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第2期221-224,共4页
Acta Metallurgica Sinica
