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研究了含0.05%Ce及不同Na,K杂质含量的8090合金薄板裂纹扩展阻力,探讨了合金断裂韧性及裂纹起始扩展阻力随(Na+K)含量变化的规律和微量Ce的作用,结果指出:随(Na+K)含量增加,合金裂纹扩展阻力下降;若(Na+K)含量处于一定范围内时,合金中加入0.05%Ce会改善其断裂韧性及裂纹起始扩展抗力;当(Na+K)含量过高,Ce的这种有益作用便被掩盖,Na,K对合金韧性造成危害的原因之一是可以促使T_1等相沿晶界或亚晶界析出,并促使再结晶晶粒异常长大。
The crack growth resistance of 8090 alloy sheet containing 0.05% Ce and different Na and K impurities was studied. The fracture toughness and the variation of (Na + K) content with the amount of Ce were investigated. The results show that : (Na + K) content increases, the crack propagation resistance decreases; if (Na + K) content is within a certain range, the addition of 0.05% Ce alloy will improve its fracture toughness and crack initiation expansion resistance; + K), the beneficial effect of Ce is obscured. One of the reasons that Na and K are harmful to the toughness of the alloy is that the T_1 phase precipitates along grain boundaries or subgrain boundaries and causes the recrystallization grains to be abnormal grow up.