【摘要】 利用物理替代方法计算出球形核的形状因子k1，推导出均质形核和无晶粒吞并时晶粒尺寸改变与电流密度的关系.计算了Pb、Sn、Cu、Fe、Al和Ni等纯金属用电流变技术直接制备块状纳米材料所需要的临界电流密度值.对Pb—Sn合金的计算表明本文的理论值与国外报导的实验结果基本一致.更多还原

【Abstract】 The shaped factor of spherical nucleus is calculated. The relationship of grain size and current density is derived in the condition of homogencous nucleation without grain swallowing. Critical current densities for Ph, Sn, Cu, Fe, Ni and Al in the fabrication of nanocrystyalline materials are presented. It shows a good agreement with the experimental data of Sn-Ph alloy.更多还原