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研究了不同变形温度下7A04铝合金组织与性能的变化规律。结果表明,在320和360℃下变形,7A04铝合金以动态回复为主要软化机制;在400℃以上变形时,发生动态再结晶,温度升高有利于动态再结晶进行。随着变形温度升高,合金中的粗大第二相减少,T5态铝合金强度、硬度、塑性均升高;7A04铝合金的断裂方式以韧窝断裂为主,随着变形温度提高,断口中的韧窝数量逐渐增多,晶粒变细。
The microstructure and properties of 7A04 aluminum alloy under different deformation temperature were studied. The results show that the dynamic recrystallization of 7A04 aluminum alloy takes dynamic recovery as the main deformation mechanism at 320 and 360 ℃. When recrystallization above 400 ℃, dynamic recrystallization occurs, and the increase of temperature is in favor of dynamic recrystallization. With the increase of deformation temperature, the coarse second phase in the alloy decreases, and the strength, hardness and plasticity of T5 aluminum alloy increase. The fracture mode of 7A04 aluminum alloy is dimple fracture. With the increase of deformation temperature, The number of dimples gradually increased, grain refinement.