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通过控制化学成分和处理工艺，得到一种弥散无序γ相强化的Ｎｉ_３Ａｌ基合金。ＴＥＭ分析发现：弥散无序的γ相是在有序γ＇基体｛００１｝面上析出的，且与基体保持共格关系。在不同温度下对该合金进行拉伸试验发现：弥散γ相的强化作用，使Ｍ_３Ａｌ基合金拉伸屈服强度的峰值温度升高到８５０℃左右；与相同处理条件下成分相近的ＩＣ２１８合金相比较，该合金的高温屈服强度和拉伸强度以及峰值温度以下的形变硬化率都发生显著的提高。文中在ＳＥＭ下对拉伸试样的断口特征进行了分析，并对无序γ相的弥散强化机理进行了探讨。
By controlling the chemical composition and processing technology, a Ni_3Al-based alloy with dispersed γ-phase strengthening was obtained. TEM analysis found that the dispersed and disorder γ phase is precipitated on the ordered γ ’matrix {001} plane and maintains the coherent relationship with the matrix. Tensile test of this alloy at different temperatures showed that the strengthening effect of dispersed γ phase increased the peak temperature of tensile yield strength of M_3Al-based alloy up to about 850 ℃. Compared with IC218 alloy with similar composition under the same treatment conditions , The high temperature yield strength and tensile strength of the alloy, as well as the deformation hardening rate below the peak temperature are significantly increased. In this paper, the fracture characteristics of tensile specimens were analyzed under SEM, and the mechanism of dispersion strengthening of disordered γ phase was also discussed.