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首页> 外文期刊>Journal of Materials Engineering and Performance >Crystallographic Analysis of Fatigue Crack Initiation Behavior in Coarse-Grained Magnesium Alloy Under Tension-Tension Loading Cycles
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Crystallographic Analysis of Fatigue Crack Initiation Behavior in Coarse-Grained Magnesium Alloy Under Tension-Tension Loading Cycles

机译：张力张力载荷循环下粗粒镁合金疲劳裂纹引发行为的晶体裂纹分析

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摘要

Plane bending fatigue tests are conducted to investigate fatigue crack initiation mechanisms in coarse-grained magnesium alloy, AZ31, under the stress ratios R = -1 and 0.1. The initial crystallographic structures are analyzed by an electron backscatter diffraction method. The slip or twin operation during fatigue tests is identified from the line angle analyses based on Euler angles of the grains. Under the stress ratio R = -1, relatively thick tension twin bands are formed in coarse grains. Subsequently, compression twin or secondary pyramidal slip operates within the tension twin band, resulting in the fatigue crack initiation. On the other hand, under R = 0.1 with tension-tension loading cycles, twin bands are formed on the specimen surface, but the angles of those bands do not correspond to tension twins. Misorientation analyses of c-axes in the matrix grain and twin band reveal that double twins are activated. Under R = 0.1, fatigue crack initiates along the double twin boundaries. The different manners of fatigue crack initiation at R = -1 and 0.1 are related to the asymmetricity of twining under tension and compression loadings. The fatigue strengths under different stress ratios cannot be estimated by the modified Goodman diagram due to the effect of stress ratio on crack initiation mechanisms.
机译：进行平面弯曲疲劳试验以研究粗粒镁合金AZ31的疲劳裂纹引发机制，在应力比R = -1和0.1下。通过电子反向散射衍射方法分析初始晶体结构。基于谷粒的欧拉角度，从线角分析中识别疲劳试验期间的滑动或双床操作。在应力比R = -1，在粗粒中形成相对厚的张力双带。随后，压缩双胞胎或次级金字塔滑动在张力双带内操作，从而导致疲劳裂纹引发。另一方面，在带有张力张力装载循环的r = 0.1下，在样本表面上形成双带，但是这些带的角度不对应于张力双胞胎。基质晶粒和双频带中的C轴的错误化分析显示，双胞胎被激活。在r = 0.1下，疲劳裂纹沿着双重双界引发。 r = -1和0.1在r = -1和0.1处的不同方式与张力和压缩负载下的缠绕性的不对称有关。由于应力比对裂纹引发机制的影响，改性的古德曼图不能估计不同应力比下的疲劳强度。

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