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Grain Growth and Texture Development in Nanostructured Invar Alloy

机译:纳米结构殷钢合金的晶粒长大和织构发展

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摘要

In the present work, a nanocrystalline Invar alloy (Fe-36wt%Ni) foil was fabricated by using a continuous electroforming method. This material exhibited outstanding mechanical properties and a relatively low thermal expansion coefficient as compared to conventional Invar alloys. The as-deposited texture was of fibre-type characterized by strong <100>//ND and weak <111>//ND components. Grain growth occurred during annealing beyond 350℃ and resulted in such texture change that the <111>//ND fibre texture strongly developed with the minor <100>//ND components. It was clarified using orientation imaging microscopy that abnormal growth of the <111 >//ND grains in the early stages of grain growth plays an important role on the texture evolution. The mechanism of the abnormal grain growth has been discussed in terms of the orientation dependence of energy density.
机译:在本工作中,通过使用连续电铸方法制造了纳米晶殷钢合金(Fe-36wt%Ni)箔。与常规的殷钢合金相比,这种材料具有出色的机械性能和相对较低的热膨胀系数。所沉积的织构是纤维类型,其特征在于强<100> // ND和弱<111> // ND成分。在超过350℃的退火过程中,晶粒生长发生,并导致织构变化,以<111> // ND纤维织构强烈地发展,并带有少量的<100> // ND组分。使用取向成像显微镜已阐明,<111> // ND晶粒的异常生长在晶粒生长的早期阶段对纹理演变起着重要作用。已经根据能量密度的取向依赖性讨论了异常晶粒生长的机理。

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