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研究了2024和2524铝合金的疲劳裂纹,并分析了合金裂纹的萌生机制。结果表明,2024-T3铝合金中有粗大的Al7Cu2(Fe,Mn)(β相)、小圆形Al2Cu Mg(S相)和Al2Cu(θ相)第二相粒子。2524-T34铝合金中有长方形Al20Cu2Mn3相(弥散相)、粗大的Al7Cu2Fe或Al2Cu2(Fe,Mn)3相(β相),以及圆形Al2Cu相(θ相或θ′相)或Al2Cu Mg相(S相)。2024-T3和2524-T34铝合金的包铝层受滑移带变形的影响而为裂纹萌生提供条件,成为裂纹萌生的主要位置。另外,其裂纹还在不同的第二相粒子处萌生。
The fatigue cracks of 2024 and 2524 aluminum alloys were studied, and the initiation mechanism of alloy cracks was analyzed. The results show that there are coarse Al7Cu2 (Fe, Mn) (β phase), small round Al2Cu Mg (S phase) and Al2Cu (θ phase) second phase particles in 2024-T3 aluminum alloy. The 2524-T34 aluminum alloy has a rectangular Al20Cu2Mn3 phase (dispersed phase), a coarse Al7Cu2Fe or Al2Cu2 (Fe, Mn) 3 phase (β phase), and a round Al2Cu phase (θ phase or θ ’phase) or Al2Cu Mg phase S phase). The aluminum clad layer of 2024-T3 and 2524-T34 aluminum alloy is affected by the deformation of slip band, which provides the conditions for crack initiation and becomes the main site of crack initiation. In addition, the cracks are also initiated at different second-phase particles.