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在保留压铸态截面的条件下 ,通过对压铸 (F )、固溶 (T 4 )和峰时效 (T 6 )三种热处理状态的压铸镁合金AZ91HP薄板试样在不同频率下的疲劳裂纹扩展速率试验结果的分析发现 ,疲劳裂纹扩展速率随着加载频率的提高而降低。固溶处理能够降低疲劳裂纹扩展速率 ,但随后的时效处理又加剧了疲劳裂纹扩展速率的提高
The die-casting magnesium alloy AZ91HP sheet specimens under three different heat treatment conditions of die-casting (F), solution (T 4) and peak aging (T 6) The analysis of the test results shows that the fatigue crack growth rate decreases with the increase of the loading frequency. Solution treatment reduced the fatigue crack growth rate, but subsequent aging accelerated the fatigue crack growth rate