挤压管状SiCw/Al复合材料中残余应力及其高温松弛行为

利用X射线应力测量方法，研究挤态20vol%SiCw/6061Al复合材料中残余应力，发现复合材料中存在较大的残余应力，而且各方向的残余应力分布很不均匀，动态测量去应力退火期间复合材料残余应力的高温松弛过程，证实高温状态下残余应力按幂指数的方式发生松弛，基于蠕变机制，分析残余应力搞温松弛行为，结果表明复合材料应力指数及应力松弛激活能明显高于基体合金。

Relaxation Behavior of Residual Stress in an Extruded Tube of the SiCw/Al Composite at High Temperature

WT5BZ]The residual stress in a 20vol%SiC w/6061Al composite as extruded was investigated by using the method of X ray stress measurement It is found that, the high residual stress exists in the composite, and the distribution of residual stress in each direction is not uniform The relaxation process of residual stress in composite was dynamically measured during annealing at high temperature It is verified that the relaxation of residual stress is in the form of power law at high temperature With the creep mechanism, the relaxation behavior of residual stresses at high temperature was analyzed The results show that, the stress exponent and activation energy for stress relaxation of composite is obvious higher than that of the matrix alloy