LOW-CYCLE FATIGUE OF A BULK AMORPHOUS ALLOY

LOW-CYCLE FATIGUE OF A BULK AMORPHOUS ALLOY
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大块非晶合金的低周疲劳

DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
Zhang Haifeng
Zhang Haifeng
中科院分区：
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文献类型：
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作者：
Zhang Haifeng

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研究了大块非晶合金Zr41.25Ti13.75Ni10Cu12.5Be22.5在室温下的低周疲劳行为。完全非晶态和部分晶化的试件在最终断裂前都没有循环硬化或软化现象。完全非晶态合金的疲劳寿命高于部分晶态合金。通过对试件断口和外表面的扫描电子显微镜观察，解释了稳定循环应变响应的机理。这两种合金的裂纹萌生阶段、扩展阶段和过载断裂区阶段是可区分的。非晶态基体中的晶相更多地表现为裂纹萌生或孔洞位置，而不是阻碍裂纹扩展的障碍物。
The low-cycle fatigue behavior of Zr41.25Ti13.75Ni10Cu12.5Be22.5 bulk amorphous alloy was investigated in fully reversed stress control at room temperature. Both fully amorphous and partially crystallized specimens show neither cyclic hardening nor softening until final fracture. The fully amorphous alloy has a superior fatigue life than the partially crystallized one. Prom SEM observations of fracture surfaces and out surfaces of the specimens, the mechanism of stable cyclic strain response is explained. The stages of crack initiation, propagation and overload fracture zone are discernable for the two alloys. The crystalline phases in the amorphous matrix behave more as sites of crack initiation or porosity instead of obstacles retarding crack propagation.