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本文通过对Al—Zn—Mg系919合金不同淬火冷却速度下(水淬、油淬和风淬)断裂韧性试验及预裂纹应力腐蚀试验的试样进行金相及断口金相观察,控讨合金的金相组织及断口特征与断裂韧性性能及应力腐蚀抗力之间的有机联系。观察分析表明:合金进行不同的热处理,导致电镜下金相组织上的差异。断口特征上的差异与断裂韧性和应力腐蚀试验数据的规律有良好的一致性。同时从断口上也可以看出Fe,Si杂质对合金的韧性不利。
In this paper, metallographic and fracture metallographic observation of fracture toughness test and pre-crack stress corrosion test of Al-Zn-Mg 919 alloy under different quenching and cooling rates (water quenching, oil quenching and wind quenching) Metallography and fracture characteristics and fracture toughness properties and stress corrosion resistance of the organic link. Observation and analysis show that: the alloy for different heat treatment, resulting in the microstructure of the electron microscopy differences. The differences in fracture characteristics are in good agreement with the laws of fracture toughness and stress corrosion test data. At the same time, it can also be seen from the fracture that Fe and Si impurities are detrimental to the toughness of the alloy.