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The method of approximate function has been applied to analyzing the widening of the peaks of X-ray diffraction caused by decreasing the size of subgrains and increasing of lattice distortion.

采用近似函数法并借助计算机计算，分析引起铜及铜合金X射线衍射峰物理宽化的微观晶块尺寸和点阵畸变大小，进而分析在纯铜中加入Ag和Sn等合金元素对其性能产生巨大影响的原因。