The effects of texture and extension twinning on the low-cycle fatigue behavior of a rolled magnesium alloy, AZ31B
The effects of texture and extension twinning on the low-cycle fatigue behavior of a rolled magnesium alloy, AZ31B
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DOI：
10.1016/j.msea.2010.07.047
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发表时间：
2010-10
期刊：
影响因子：
6.4
通讯作者：
L. Wu;S. Agnew;Yang Ren;D. Brown;B. Clausen;G. M. Stoica;H. Wenk;P. Liaw
中科院分区：
文献类型：
--
作者：
L. Wu;S. Agnew;Yang Ren;D. Brown;B. Clausen;G. M. Stoica;H. Wenk;P. Liaw
研究了织构对轧制态AZ 31 B镁合金室温低周疲劳行为的影响。结果表明，Coffin-Manson和Basquin关系可以用来描述合金的疲劳抗力。由于面内织构的对称性，沿着轧制方向加载的合金的低周疲劳抗力仅略好于沿沿着横向加载的合金。面内情况下表现出更好的疲劳性能比通过厚度加载。中子衍射和同步辐射衍射被用来帮助对这些发现进行机理上的理解。面内载荷和全厚度载荷之间的低周疲劳行为的根本差异归因于所涉及的孪生和去孪生机制的不同激活序列，特别是在全厚度试验期间对晶粒的c轴压缩的更大要求。不同的激活序列基本上由初始晶体学织构确定，从而观察到倒置的双晶环形状。
The effect of texture on the low-cycle fatigue behavior of a rolled magnesium alloy, AZ31B, was studied at room temperature. It is shown that the Coffin–Manson and Basquin relationships can be used to describe the fatigue resistance of the alloy. The alloy loaded along the rolling direction exhibits only slightly better low-cycle fatigue resistance than that loaded along the transverse direction, due to the in-plane texture symmetry. The in-plane cases exhibit better fatigue behavior than the through-thickness loading. Neutron diffraction and synchrotron diffraction were employed to assist in making mechanistic understandings for the findings. The fundamental difference in the low-cycle fatigue behaviors between the in-plane and through-thickness loadings is attributed to the different activation sequences of twinning and detwinning mechanisms involved and, particularly, the greater requirement for c-axis compression of the grains during the through-thickness tests. The different activation sequences are essentially determined by the initial crystallographic texture, such that the inverted hysteresis-loop shapes are observed.