The micro-mechanism of fatigue crack propagation for a forged Mg-Zn-Y-Zr alloy in the gigacycle fatigue regime
文献类型：期刊论文
| 作者 | D. K. Xu ; L. Liu ; Y. B. Xu ; E. H. Han |
| 刊名 | Journal of Alloys and Compounds
 |
| 出版日期 | 2008 |
| 卷号 | 454期号:1-2页码:123-128 |
| 关键词 | M-Zn-Y-Zr magnesium alloy gigacycle fatigue micro-mechanism magnesium alloy re alloys mechanical-properties cycle fatigue life regime behavior steels |
| ISSN号 | 0925-8388 |
| 中文摘要 | In the gigacycle fatigue regime (106 to 109 Cycles), the micro-mechanism of fatigue crack propagation for a forged Mg-Zn-Y-Zr alloy subjected to temper treatment (T5) has been studied. High-magnified images of the different crack propagation regions indicate that when the effective stress intensity factor K(eff) is below 3.2 MPa m(1/2), in Region 1, the fracture surface is smooth covered with many flat facets. However, when the stress intensity factor is higher than 3.2 MPa m(1/2), in Region 2, many larnellar semi-cleavage planes caused by rod-like beta(1)', precipitates can be observed, resulting in a rather rough fracture surface. However, in Region 3, no lamellar semi-cleavage planes but lots of zonal distributed Mg(3)Zn(3)Y(2) phases can be observed. It suggests that with the increase of the crack-tip driving force, the preferential path for fatigue crack propagation changes from the rod-like beta(1)' precipitates to the zonal distributed Mg(3)Zn(3)Y(2) phases. In addition, two kinds of fatigue striations, i.e. striations formed on the flat fracture surface and striations formed on the cleavage steps, have been observed. Based on double-slip and plastic obtuseness at the crack tip, the forming mechanism of the fatigue striations on the cleavage steps has been discussed. (C) 2006 Elsevier B.V. All rights reserved. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/33242]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | D. K. Xu,L. Liu,Y. B. Xu,et al. The micro-mechanism of fatigue crack propagation for a forged Mg-Zn-Y-Zr alloy in the gigacycle fatigue regime[J]. Journal of Alloys and Compounds,2008,454(1-2):123-128. |
| APA | D. K. Xu,L. Liu,Y. B. Xu,&E. H. Han.(2008).The micro-mechanism of fatigue crack propagation for a forged Mg-Zn-Y-Zr alloy in the gigacycle fatigue regime.Journal of Alloys and Compounds,454(1-2),123-128. |
| MLA | D. K. Xu,et al."The micro-mechanism of fatigue crack propagation for a forged Mg-Zn-Y-Zr alloy in the gigacycle fatigue regime".Journal of Alloys and Compounds 454.1-2(2008):123-128. |
入库方式： OAI收割
来源：金属研究所
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