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中文摘要：
空位以及多空位的形成能的计算对研究空演位变行为有重要意义.本文利用已经现有的单、双空位形成能结果,采用刚性球模型来表达空位,得出了金属多空位形成能的计算公式,并且进行了讨论.计算了部分体心立方过渡金属的多空位形成能（3空位,4空位）和结合能,并与现有的结果进行比较,结果相差较小.
英文摘要：
The calculation of vacancy and vacancy-cluster formation energy is significant important to the vacancies evolution. The present results of mono-vacancy and di-vacancy formation energy were used. The vacancy is consid- ered as a rigid ball, and the formula that to calculate the multi-vacancy formation energy was gotten and discussed. The formation and cohesive energy of the vacancies in BCC transition metals were calculated, which were compared with present result, both the results are matched.
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