摘要
通过等温热压缩实验,研究了原位合成TiB和TiC增强Ti基复合材料在550°C^750°C、0.0001s^(-1)~0.0004s^(-1)应变速率条件下的高温流变行为。结果表明:该复合材料在高温塑性变形时,压缩流变应力随变形温度的提高而降低,随应变速率的提高而提高;材料的软化机制以动态回复为主,动态再结晶为辅;利用Arrhenius方程模型结合Zener-Hollomon修正参数计算出材料的热变形参数,建立了双曲正弦形式的本构方程。
The flow stress behavior of an in situ synthesized TiB and TiC reinforced Ti matrix composite was studied by isothermal hot compression tests with temperature ranging from 550 ℃ to750℃and strain rate from 0.0001s-1 to 0.0004s-1.Results show that the flow stress decreases with the increase in temperature,and increases with the increase in strain rate.The softening mechanism during the hot deformation is mainly determined by dynamic recovery with the support of dynamic recrystallization.The constitutive parameters of the composite were calculated on the basis of Arrhenius model and Zener-Hollomon parameter,and the constitutive equation in hyperbolic form was established.
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2016年第4期1197-1201,共5页
Journal of Jilin University:Engineering and Technology Edition
基金
吉林省自然科学基金项目(201215026)
关键词
复合材料
本构方程
热压缩实验
流变应力行为
composite materials
constitutive equation
hot compression test
flow stress behavior
