Relaxation of residual stresses in 20%SiCw/6061Al composite as-extruded at high temperature
来源期刊：中国有色金属学报(英文版)2001年第5期
论文作者：姜传海 吴建生 王德尊
文章页码：729 - 732
Key words：SiCwhisker; Al-matrix composite; residual stress; stress relaxation; X-ray diffraction
Abstract: The residual stress in a 20%SiCw/6061Al composite as-extruded was investigated by using X-ray stress measurement method. It was found that, high residual stress existed in the composite and residual stress distribution in each direction are not uniform. Relaxation process of residual stress in the composite was dynamically measured during annealing at high temperature. It is verified that the relaxation of residual stress obeys the 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 the composite are obviously higher than those of the matrix alloy.
