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研究塑性变形对Mg-10Gd-3Y-0.6Zr合金析出行为及拉伸断裂行为的影响。结果表明:塑性变形引发的晶体缺陷为时效析出提供了更多的形核核心,不仅使β′相的数量增加,还促进晶界、孪晶与基体界面处析出相的生成。析出相数量的增多可有效阻碍拉伸变形过程中的位错滑移从而强化合金基体,2%变形合金可实现强度与塑性的良好配合。塑性变形量增大,微裂纹在晶界析出相与基体界面处产生并沿晶界扩展,再加之断口表面平滑刻面的形成导致合金的拉伸性能降低。
The effect of plastic deformation on the precipitation behavior and tensile fracture behavior of Mg-10Gd-3Y-0.6Zr alloy was studied. The results show that the crystal defects induced by plastic deformation provide more nucleation nuclei for precipitation, which not only increases the amount of β ’phase but also promotes the formation of precipitates at grain boundary, twin and matrix interface. The increase of the amount of precipitated phase can effectively hinder the dislocation slip during the tensile deformation process to strengthen the alloy matrix, 2% deformation of the alloy can achieve good strength and plasticity. The amount of plastic deformation increases. The micro-cracks are generated at grain boundary interface and matrix interface and extend along the grain boundaries. Combined with the formation of smooth facets on the fracture surface, the tensile properties of the alloy decrease.