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为了寻求低能耗的铝合金强化工艺,分别对5052-H34和5052-O铝合金进行了搅拌摩擦加工(FSP),利用OM、TEM和拉伸研究了搅拌摩擦加工对铝合金显微组织和拉伸性能的影响。结果表明:退火处理和搅拌摩擦加工均可降低5052-H34合金的位错密度;5052-H34铝合金经搅拌摩擦加工后伸长率提高了111.8%,但搅拌摩擦加工对5052-O铝合金的力学性能影响不明显;搅拌摩擦加工引起的动态再结晶有利于获得细小的等轴晶,从而导致晶界面积和动态应变效应增加。因此,FSP试样拉伸曲线的应力降较明显。
In order to seek the low energy consumption aluminum alloy strengthening process, 5052-H34 and 5052-O aluminum alloy were subjected to friction stir processing (FSP) respectively. The effects of friction stir processing on the microstructure and tensile strength Tensile properties. The results show that the dislocation density of 5052-H34 alloy can be reduced by both annealing treatment and friction stir processing. The elongation of 5052-H34 aluminum alloy increases by 111.8% after friction stir processing. However, The mechanical properties have no obvious influence on the mechanical properties. The dynamic recrystallization caused by the friction stir processing is beneficial to obtain the fine equiaxed grains, which leads to the increase of the grain boundary area and the dynamic strain effect. Therefore, the stress drop of FSP specimen tensile curve is obvious.