金属并不是一个均匀的系统,它的熔化往往是从晶界的边缘,或者从含有熔点较低的组分的部位开始发生.中学时候学过金属都是多晶,也就是说,由很多细小的单晶组合而成,这些单晶小块,被称为grain（谷粒）,而这些grain附近的...
英语翻译since metals are not completely homogenous,melting usual
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