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Nb在合金中以大约5∶3∶1的比例分布在γ,γ′和碳化物相中,随着合金中Nb含量增加,应力指数m减小,Q_(app)增加,并满足关系式 Q_(app)=Be~(kx/lge) Nb降低合金晶粒度和γ基体堆垛层错能,稳态蠕变速率服从 _s∝L~b γ_SFE)~α Nb增加γ′相体积分数,颗粒半径和长程有序度。若引进有效应力(σ-σ_b)来描述稳态蠕变速率的应力关系,蠕变表达式为 _s=A_1L~bγ_(SFE)~α(σ-σ_b)~n0exp[-(Q_(app)/RT)]薄膜透射电镜观察表明:在(111)滑移面上α/2[10]全位错切割γ′相时被分解为α/6[11]和α/6[2]偏位错。测得超点阵位错对间距约为100—165,与所测得的γ′相颗粒尺寸相近。
Nb is distributed in the γ, γ ’and carbide phases in the alloy in the ratio of about 5: 3: 1. As the Nb content in the alloy increases, the stress exponent m decreases and Q app increases and satisfies the relation Q_ (app) = Be ~ (kx / lge) Nb reduces the alloy grain size and the stacking fault energy of γ matrix, the steady state creep rate obeys _sαL ~ b γ_SFE) ~ α Nb increases the γ ’phase volume fraction, Particle radius and long-range order. If the effective stress (σ-σ_b) is introduced to describe the stress relationship of steady-state creep rate, the creep expressions are as follows: / RT)] thin film transmission electron microscopy showed that: α / 6 [11] and α / 6 [11] were decomposed when the γ ’phase was completely dislocated by α / 2 [10] 2 ] partial dislocation. The measured superlattice dislocation spacing is about 100-165 , similar to the measured γ ’phase particle size.