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采用铸锭冶金法制备含0.06%Sc的6005A铝合金铸锭，合金铸锭经均匀化处理后被热挤压成8 mm厚的实心型材，研究了该实心型材在不同应力水平和时效状态下的疲劳行为。结果表明：添加微量的Sc能明显提升6005A合金的疲劳强度。合金在不同应力水平下的疲劳断口均存在明显的裂纹源区、疲劳裂纹扩展区和瞬断区；合金疲劳裂纹主要萌生在氧化夹杂物和孔洞处；随应力水平的提高，合金疲劳辉纹宽度增大，二次裂纹尺寸增大、数量增多；欠时效状态下合金具有最佳的抗疲劳裂纹扩展能力。
Abstract：The 6005A aluminum alloy ingots, with slight addition(0.06%) of Sc, were prepared by casting metallurgy. After homogenization, the alloy ingots were hot extruded into alloy profiles with a thickness of 8 mm. The current work investigates the fatigue behavior of the alloy profiles subjected to various magnitude of stresses and different aging treatments. It has been revealed that slight addition of Sc can significantly improve the fatigue resistance of the 6005A alloy. The locations of the crack source, the region where the fatigue crack propagated, and the location where fracture occurred have been observed on all the alloy samples subjected to different magnitude of stresses. The cracks mainly initiated at the locations with oxides and pores. With the increase of the stresses, the width of the fatigue striations was larger, and both the density and the dimension of the secondary cracks increased. The highest resistance against fatigue crack propagation was observed on the under-aged alloy.
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基本信息:
DOI：10.13291/j.cnki.djdxac.2026.03.013
中图分类号:TG146.21
引用信息:
[1]于庆斌,李国良,潘清林.含Sc 6005A铝合金的疲劳行为研究[J].大连交通大学学报,2026,47(03):110-118+126.DOI:10.13291/j.cnki.djdxac.2026.03.013.
基金信息:
国家重点研发计划项目(2022YFB4301104)
2024-06-25
2024
2024-09-10
2024-09-16
2024
1
2026-06-15
2026-06-15