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通过扫描电镜、透射电镜、光学金相等手段对ＬＹ１２ＣＺ铝合金疲劳短裂纹的微观机制进行了分析研究，结果表明，材料的微观组织对短裂纹扩展行为有很大影响
The microscopic mechanism of fatigue crack in LY12CZ aluminum alloy was analyzed by means of scanning electron microscope, transmission electron microscopy and optical metallography. The results show that the microstructure of material has a great influence on the propagation of short crack