织构对搅拌摩擦加工镁合金力学性能的影响研究现状

Research Status on Effect of Texture on the Mechanical Properties of Friction Stir Processed Magnesium Alloy

镁及镁合金的力学性能主要影响因素包括晶粒尺寸、织构和第二相,其中,织构对镁及镁合金的力学行为影响较为复杂。搅拌摩擦加工(Friction Stir Processing,FSP)后的镁及镁合金织构变化复杂,因此对搅拌摩擦加工过程中镁及镁合金织构演变规律的研究具有重要意义。在介绍镁及镁合金形变系统的基础上,综述了镁及镁合金板材在搅拌摩擦加工过程中的织构演化规律及形成机理,织构的演化与材料所受应力状态和流动状态有关。分析了织构对室温拉伸性能的影响,出现各向异性现象,其实质是织构的软化和硬化效应;织构对超塑性行为的影响,织构对镁及镁合金塑性变形机理的影响。最后探讨了FSP镁及镁合金未来需深入研究的方向。

Main factors affecting the mechanical properties of magnesium and magnesium alloys include grain size, texture and the second phase, among which the effect of the texture is more complicated. The evolution of texture of magnesium alloy is complex during friction stir processing （FSP） , so related study on the deformation system and texture evolution of magnesium alloy is of great significance in friction stir processing. Based on the introduction of deformation system of magnesium alloy, texture evolution regulation and mechanism of friction stir processed magnesium alloy are summarized, the evolution of texture is related to the stress state and flow state of the material. Then the effect of texture on the tensile properties of the room temperature, the superplastic behavior and the plastic deformation mechanism of magnesium and magnesium alloy are analyzed in detail. Finally, the further research directions for FSP magnesium and magnesium alloy are discussed.