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通过[001]取向镍基单晶合金拉伸蠕变期间的组织形貌观察,采用应力应变有限元方法计算出立方γ/γ′两相共格界面的vonMises应力分布,研究了合金在蠕变期间γ′相的定向粗化规律。结果表明,施加拉应力可改变立方γ/γ′两相的应力分布,使不同晶面发生晶格收缩与扩张应变,其中,(001)晶面产生晶格收缩可排斥较大半径的Al、Ti原子,(100)和(010)晶面沿平行于应力轴方向产生晶格扩张应变,可诱捕较大半径的Al、Ti原子,是使其γ′相沿扩张晶格的法线定向生长成为类似筛网层状结构的组织演化规律。并进一步提出蠕变期间发生元素扩散和γ′相定向生长的驱动力。
Through the stress-strain finite element method, the von Mises stress distribution of the cubic γ / γ ’coherent interface was calculated by observing the microstructure of the [001] -oriented Ni-based single crystal alloy during tensile creep. During the γ ’phase directional roughening law. The results show that the stress distribution of the cubic γ / γ ’phase can be changed by applying tensile stress, and lattice shrinkage and expansion strain occur at different crystal planes. Lattice contraction of the (001) crystal plane can repel Al with larger radius, Ti atoms, (100) and (010) planes produce lattice expansion strains parallel to the stress axis and trap Al and Ti atoms of larger radius so that the γ ’phase grows normal to the normal direction of the expanding lattice Similar to the layered structure of the mesh structure evolution. The driving force for elemental diffusion and directional growth of γ ’phase during creep was further proposed.