论文部分内容阅读
研究了不同变形温度和变形次数下7A04铝合金组织与性能的变化规律。结果表明,在320、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。变形温度升高,合金中的粗大第二相减少,T6态铝合金强度随变形温度的升高而增大,塑性则先降低后增加。随着变形次数增加,在320℃和360℃变形时,第二相聚集粗化,分布在晶界上,合金的强度和塑性均下降;而在400℃以上变形时,强度和塑性在变形次数低于4次时增加。
The variation of microstructure and properties of 7A04 aluminum alloy under different deformation temperatures and deformation times was studied. The results show that the dynamic recrystallization of 7A04 aluminum alloy is the main softening mechanism at 320 and 360 ℃, and the dynamic recrystallization occurs when the deformation is over 400 ℃. The increase of temperature is conducive to dynamic recrystallization. When the deformation temperature increases, the coarse second phase in the alloy decreases. The strength of the T6 aluminum alloy increases with the increase of the deformation temperature, while the plasticity first decreases and then increases. With the increase of deformation times, the second phase aggregates and coarsens on the grain boundary when the deformation occurs at 320 ℃ and 360 ℃, and the strength and plasticity of the alloy decrease. When the deformation exceeds 400 ℃, Increase less than 4 times.