本文利用“有序—无序”模型对Ni_3Al中的点阵空位与成分的关系进行了计算,结果证明,当Al含量超过化学计量值时,Ni_2Al中有大量的点阵空位存在,称之非化学计量空位。正电子湮没技术证实了这种空位的存在。由此解释了Al含量对硼韧化作用的影响。
The "order-disorder" model was adopted to calculate the lattice vacancy relatedto the composition change in Ni_3Al alloys. A great deal of vacancies, i. e., the non-stoichiome-tric vacancies, may exist in the Ni_3Al alloys containing Al over stoichiometry, saying, 25 at.-%.This was confirmed by the positron annihilation technique. Therefore, the influence of Al con-tent on the bettering behaviour of B towards the ductility of Ni_3Al alloys can be understoodthrough the interaction of non-stoichiometric vacancy and B atom.
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