Effect of age condition on fatigue properties of 2E12 aluminum alloy

来源期刊：中南大学学报(英文版)2010年第4期

论文作者：闫亮 杜凤山 戴圣龙 杨守杰

文章页码：697 - 702

Key words：2E12 aluminum alloy; aging; fatigue life; fatigue crack growth rate; fatigue fracture

Abstract: The fatigue behaviors of 2E12 aluminum alloy in T3 and T6 conditions at room temperature in air were investigated. The microstructures and fatigue fracture surfaces of the alloy were examined by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The results show that the alloy exhibits higher fatigue crack propagation (FCP) resistance in T3 condition than in T6 condition, the fatigue life is increased by 54% and the fatigue crack growth rate (FCGR) decreases significantly. The fatigue fractures of the alloy in T3 and T6 conditions are transgranular. But in T3 condition, secondary cracks occur and fatigue striations are not clear. In T6 condition, ductile fatigue striations are observed. The effect of aging conditions on fatigue behaviors is explained in terms of the slip planarity of dislocations and the cyclic slip reversibility.

基金信息：the National Basic Research Program of China