Low cycle fatigue of a rare-earth containing extruded magnesium alloy
Low cycle fatigue of a rare-earth containing extruded magnesium alloy
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含稀土挤压镁合金的低周疲劳
DOI：
10.1016/j.msea.2013.03.041
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发表时间：
2013-07
期刊：
影响因子：
6.4
通讯作者：
Zeng, X. Q.
中科院分区：
文献类型：
--
作者：
Mirza, F. A.;Chen, D. L.;Li, D. J.;Zeng, X. Q.
超轻镁合金的应用不可避免地涉及循环载荷下的抗疲劳性。研究了含稀土元素的Mg-10 Gd-3 Y-0.5Zr（GW 103 K）合金在挤压态下的应变控制循环变形行为及显微组织的影响。该合金的显微组织由平均晶粒尺寸约为12μm的细小等轴晶和大量含稀土的析出相组成。与无RE挤压镁合金不同，该合金表现出基本上循环稳定和对称的磁滞回线，而没有拉伸-压缩不对称性，这是由于存在相对较弱的织构和抑制孪晶活动所产生的细晶粒尺寸，特别是含RE的沉淀物。对沉淀物对孪晶的阻碍作用作了详细的分析。虽然这种合金具有较低的循环应变硬化指数比无稀土挤压镁合金，它有一个更长的疲劳寿命，这也可以描述的Coffin-Manson定律和Basquin的方程。观察到疲劳裂纹从试样表面萌生，在萌生部位有一些解理状刻面。裂纹扩展的基本特征是疲劳条纹结合二次裂纹。
The application of ultra-lightweight magnesium alloys inevitably involves fatigue resistance under cyclic loading. The present study was aimed at evaluating strain-controlled cyclic deformation behavior and the relevant effect of microstructure in a rare-earth (RE) element containing extruded Mg–10Gd–3Y–0.5Zr (GW103K) alloy. The microstructure of this alloy consisted of fine equiaxed grains with an average grain size of about 12μm and a large number of RE-containing precipitates. Unlike the RE-free extruded magnesium alloys, this alloy exhibited essentially cyclic stabilization and symmetrical hysteresis loops without tension–compression asymmetry due to the presence of the relatively weaker texture and the suppression of twinning activities arising from the fine grain size and especially RE-containing precipitates. A detailed analysis for understanding the obstructive role of the precipitate to twinning has been presented. While this alloy had a lower cyclic strain hardening exponent than the RE-free extruded magnesium alloys, it had a longer fatigue life which can also be described by the Coffin–Manson law and Basquin's equation. Fatigue crack was observed to initiate from the specimen surface with some cleavage-like facets at the initiation site. Crack propagation was basically characterized by fatigue striations in conjunction with secondary cracks.
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影响因子：
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作者：
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通讯作者：
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DOI：
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发表时间：
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影响因子：
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