Effect of dispersoids on fatigue crack propagation in aluminium alloys

L. Edwards, J. Martin
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引用次数: 11

Abstract

Abstract The fatigue crack propagation characteristics of three peak aged Al–Mg–Si alloys have been determined. One was of essentially ternary composition, the others contained increasing volume fractions of 0·1 μm dia. dispersoid particles. The stress intensity thresholds for fatigue crack propagation ∆K TH increased with increasing volume fraction of dispersoid. At low and intermediate values of stress intensity ∆K, the crack growth rate decreased as the volume fraction of dispersoid increased. However, at high values of ∆K, void coalescence around coarse particles could outweigh the beneficial effect of the dispersoids. The degree of intergranular fracture occurring in the alloys was shown to be dependent on the maximum stress intensity in the fatigue cycle K max. The micromechanism of intergranular fracture was identified as microvoid coalescence along the grain boundary precipitate free zone. The concept of a semicohesive zone ahead of the fatigue crack tip is shown to be useful in modelling the micr...
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分散体对铝合金疲劳裂纹扩展的影响
研究了三种峰时效Al-Mg-Si合金的疲劳裂纹扩展特性。其中一种基本为三元组成,其他两种的体积分数均为0.1 μm。分散体粒子。随着弥散体体积分数的增加,疲劳裂纹扩展的应力强度阈值∆K TH增大。在低、中应力强度∆K值下,裂纹扩展速率随分散体体积分数的增加而减小。然而,在较高的∆K值下,粗颗粒周围的空洞聚并可能超过分散体的有益作用。合金的晶间断裂程度与疲劳循环的最大应力强度kmax有关。晶间断裂的微观机制是沿晶界无析出带的微孔洞聚结。在疲劳裂纹尖端前面的半粘结区概念在模拟微裂纹的过程中是有用的。
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