论文部分内容阅读
为了确定固溶处理和时效处理对Al-4%Mg-0.3%Ce挤压变形铝合金的疲劳变形和断裂行为的影响,在不同外加总应变幅下进行应变控制的室温低周疲劳试验。结果表明,固溶处理可提高Al-4%Mg-0.3%Ce挤压变形铝合金的疲劳寿命,而时效处理则导致合金的疲劳寿命有所降低;不同处理状态的Al-4%Mg-0.3%Ce挤压变形铝合金在较高外加总应变幅下疲劳变形时,均可发生动态应变时效。此外,疲劳断口形貌观察表明,不同处理状态的Al-4%Mg-0.3%Ce挤压变形铝合金中,疲劳裂纹均是以穿晶方式萌生于试样表面并以穿晶方式扩展。
To determine the effects of solution treatment and aging treatment on the fatigue deformation and fracture behavior of Al-4% Mg-0.3% Ce alloy, strain controlled low-cycle fatigue tests were carried out at different applied total strain amplitude. The results show that the solution treatment can improve the fatigue life of Al-4% Mg-0.3% Ce alloy, while the aging treatment reduces the fatigue life of Al-4% Mg-0.3% Ce alloy. % Ce extruded aluminum alloy at a higher total strain amplitude of fatigue deformation, dynamic strain aging can occur. In addition, the observation of the fatigue fracture surface shows that the fatigue cracks in the Al-4% Mg-0.3% Ce alloy under different processing conditions are all initiated by the transgranular method on the surface of the sample and expanded by the transgranular method.