以下为句子列表：
英文: Abstract: The micro-mechanism of short crack and the influence of micro-structures on short crack propagation have been investigated by OM，SEM and TEM for a LY12CZ Aluminium alloy.
中文: 文摘: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。
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