International Journal of Fatigue ( IF 5.7 ) Pub Date : 2021-10-06 , DOI: 10.1016/j.ijfatigue.2021.106583 Ya-Long Yang 1, 2 , Zhen-Qiang Song 3 , Jian Xu 1
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In this work, fracture behaviors of MRI compatible Nb-60Ta-2Zr alloy were investigated under quasi-static and fatigue loadings. The tensile fracture started with the decohesion of grain boundaries, and followed by microvoid coalescence. Fatigue tests were performed at ambient air as well as in simulated physiological solution with pH = 5.0 at R = 0.1. No deterioration happened with fatigue limit of 300 MPa when loaded in the corrosive solution. For both environments, the fatigue crack initiated at grain boundary and then propagated transgranularly. The grain boundary strength plays a key role in the fracture under both quasi-static and cyclic loadings.
中文翻译：
MRI兼容Nb-60Ta-2Zr合金在模拟生理溶液中的腐蚀疲劳行为
在这项工作中，研究了 MRI 兼容 Nb-60Ta-2Zr 合金在准静态和疲劳载荷下的断裂行为。拉伸断裂开始于晶界的脱聚，然后是微孔合并。疲劳测试在环境空气以及 pH = 5.0、R = 0.1 的模拟生理溶液中进行。加载在腐蚀性溶液中，疲劳极限为300 MPa，未发生劣化。对于这两种环境，疲劳裂纹在晶界处开始，然后沿晶传播。晶界强度在准静态和循环载荷下的断裂中起着关键作用。
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