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对含铒铝合金板材进行了不同的热处理,分析了各板材的显微组织对疲劳裂纹扩展和力学性能的影响。结果表明:晶粒的长/径比越小,板材的疲劳裂纹扩展速率越慢;且随着疲劳裂纹扩展速率的降低,裂纹宽度增加且裂纹路径曲折;稀土元素Er的加入,在合金中形成Al_3(Er,Zr)第二相粒子,其强烈地钉扎位错,阻碍位错运动,以减少位错在晶界处的聚集产生的应力集中,降低板材的疲劳裂纹扩展速率。
Different heat treatment was carried out on the erbium aluminum alloy plate, and the influence of the microstructure of each plate on the fatigue crack growth and the mechanical properties was analyzed. The results show that the smaller the ratio of grain length to diameter is, the slower the fatigue crack growth rate is. The crack width increases with the decrease of fatigue crack growth rate and the crack path is tortuous. The addition of rare earth element Er forms in the alloy The Al 2 (Er, Zr) second phase particles strongly pin the dislocations and impede the dislocation movement, so as to reduce the concentration of stress caused by the aggregation of dislocations at the grain boundaries and reduce the fatigue crack growth rate.