中文摘要：

采用置换原子的热力学模型，计算了Ni—Al-Ta／Mo合金的层错能。分析了Ni-Al-Ta／Mo合金中各元素浓度及温度对层错能的影响。结果表明：Ni-Al-Ta／Mo合金的层错能随Al含量的增加而明显降低，其中，随Al浓度提高，合金中原子偏聚自由能（△Gs^γ→ε）降低，可促进γ’有序相的形成是使合金层错能降低的主要原因。随Mo／Ts含量的提高，可引起置换原子自由能（△Gb^γ→ε）降低，原子偏聚自由能（△G：～）升高；随温度提高，Ni—Al-Ta／Mo合金中的置换原子自由能（△Gb^γ→ε）增加，表明合金中发生原子置换需要外部供给能量，而引起原子偏聚自由能（△Gs^γ→ε）升高，表明高温不利于溶质原子的偏聚。

英文摘要：

Using the thermodynamic model of the substituting atoms, the stacking fault energy （SFE） of Ni-Al-Ta/Mo alloys has been calculated, and the influences of the elements and temperatures on SFE of Ni-Al-Ta （Mo） alloys have been analyzed. Results show that the SFE of Ni-Al-Ta/Mo alloys decreases obviously with the increase of Al concentration, thereinto, the fact that the accumulated Gibbs free energy （△Gs^γ→ε） decreases with the increase of the Al concentration promotes the accumulation of the Al atoms to form the γ＇-Ni3Al order phase with LI2 structure, which is a main reason for reducing SFE of Ni-Al-Ta/Mo alloys. The fact that enhances the concentration of the elements Ta/Mo decreases the replacing Gibbs free energy （△Gb^γ→ε） of atoms, and increases the accumulated Gibbs free energy （△Gs^γ→ε） of atoms. With the elevated temperature, the increment of △Gb^γ→ε shows that the atoms replacing occurred in the alloy needs supplying energy by environment, and the increment of △Gs^γ→ε shows that the atomic accumulation is not easily occurred in high temperature.