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本文的研究对象是一种具有面心立方结构的以γ′相沉淀强化的铁基合金,应用透射电镜观察和分析了此合金在高温拉伸时的变形方式和特点。得出此合金的高温变形过程是以滑移和孪生两种方式进行的,其中主要是滑移,辅之以孪生变形。孪生的发生与合金的显微组织结构有关,γ′相的析出以及基体的较低层错能都有利于形成形变孪晶,但沿晶界的胞状析出物对滑移的阻碍作用则是导致孪生的主要原因。文中根据所得的试验结果,讨论了形变孪晶的产生条件,并分析了形变孪晶与合金塑性之间的关系,提出了新的见解。
The research object of this paper is an iron-based alloy with face-centered cubic structure precipitated by γ ’phase. The deformation mode and characteristics of this alloy during high temperature stretching were observed and analyzed by transmission electron microscope. The conclusion is drawn that the high temperature deformation of this alloy is carried out in two ways: slippage and twinning, of which the main one is slippage, which is complemented by the twin deformation. The occurrence of the twin is related to the microstructure of the alloy. The precipitation of γ ’phase and the lower layer fault energy of the matrix are both conducive to the formation of deformation twins. However, the cell-like precipitates along the grain boundary impede the slippage The main reason for twins. Based on the experimental results obtained, the conditions for the formation of twins are discussed, and the relationship between deformation twins and the plasticity of the alloy is analyzed and new ideas are put forward.