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通过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,探讨了金属型铸造Al-Si-Cu-Er合金的疲劳变形和断裂行为。结果表明,在低周疲劳加载下,金属型铸造Al-Si-Cu-Er合金表现为循环应变硬化、循环稳定;金属型铸造Al-Si-Cu-Er合金的弹性应变幅、塑性应变幅与疲劳断裂时的载荷反向周次之间的关系可分别用Basquin和Coffin-Manson公式描述;金属型铸造Al-Si-Cu-Er合金在低周疲劳加载条件下,裂纹均以穿晶方式萌生于试样表面,并以穿晶方式扩展。
The fatigue deformation and fracture behavior of the Al-Si-Cu-Er alloy cast by metal casting were investigated by low temperature fatigue testing under different total applied strain. The results show that the Al-Si-Cu-Er alloy cast by metal casting exhibits cyclic strain hardening and cyclic stability under low cyclic fatigue loading. The elastic strain amplitude and plastic strain amplitude of the Al-Si-Cu- The relationship between the load reversal cycles under fatigue failure can be described by Basquin and Coffin-Manson equations, respectively. In the case of low cycle fatigue loading, the cracks are all initiated by transgranular deposition in the Al-Si-Cu-Er alloy On the sample surface, and to transgranular expansion.