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驻留滑移带与晶界和孪晶界的交互作用

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Abstract:

?对含有退火孪晶的多晶铜进行了不同塑性应变幅下的应变疲劳实验,利用扫描电镜及其电子通道衬度技术(sem-ecc)观察了表面滑移形貌、疲劳裂纹和位错组态,研究了驻留滑移带与晶界和孪晶界的交互作用.结果表明,在晶界附近和远离晶界处观察到位错组态分布的不均匀现象.这种不均匀性导致多晶铜中疲劳裂纹首先沿着普通大角晶界开裂,在孪晶界处由于应变相容性较好而难以产生疲劳裂纹.

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