Effect of aging state on fatigue property of wrought aluminum alloys
Effect of aging state on fatigue property of wrought aluminum alloys
复制标题
时效状态对变形铝合金疲劳性能的影响
DOI：
10.1016/j.ijfatigue.2021.106682
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发表时间：
2022-03-01
影响因子：
6
通讯作者：
Zhang, Z. F.
中科院分区：
文献类型：
--
作者：
Gong, B. S.;Zhang, Z. J.;Zhang, Z. F.
变形铝合金的高周疲劳行为对其工业应用具有重要意义。为了优化变形铝合金的疲劳性能，研究了时效工艺对7N01、7075和2024铝合金疲劳性能的影响。结果表明，在三种时效状态中，过时效试样的抗拉强度最低，但疲劳强度最高。对位错形貌的进一步研究表明，在过时效状态下，位错易于在第二相界聚集和湮灭，从而降低了晶界处的疲劳损伤程度。此外，晶界析出相的不连续分布和无析出相区宽度的增加也有助于提高过时效态的疲劳性能。这些结果对优化变形铝合金的疲劳性能和工业应用具有重要意义。
The high-cycle fatigue (HCF) behaviors of wrought Al alloys are vitally important for their industrial application. To optimize the fatigue property of the wrought Al alloy, the effects of aging conditions on the fatigue properties of 7N01, 7075 and 2024 Al alloys were studied. The results show that the overaged samples have the lowest tensile strength among the three aging states, but their fatigue strength is the highest. Further investigations on the dislocation morphologies indicates that the dislocations are easy to accumulate and annihilate at the second phase boundaries for the overaged state, which reduces the fatigue damage degree at the grain boundaries. Besides, the discontinuous distribution of the grain boundary precipitates and the increased width of the precipitate-free zone also contributed to the improved fatigue property of the overaged state. Those results should be significantly important for the optimization of their fatigue properties and the industrial application of wrought Al alloys.