退火对冷轧态Al-0.04Er和Al-0.08Zr合金组织和性能的影响

Influence of annealing on microstructure and properties of cold rolled Al-0. 04Er and Al-0. 08Zr alloys

本文对比研究了Al-Er和Al-Zr冷轧后退火过程中的组织和性能变化。结果表明,相同含量的Er元素比Zr元素对电导率的影响小,而且在退火析出过程中Er元素能够比较充分的析出,退火后Al-Er合金的电导率高于Al-Zr合金。冷轧态Al-Zr合金退火过程中由于Zr原子的析出会导致电导率上升,但析出的二次相的增强作用较弱,由于退火过程中的回复和再结晶使得合金的硬度下降。冷轧态Al-Er合金在退火过程中Er原子的析出会导致电导率上升,而且析出的二次相能起到显著的增强作用,在退火过程中能够阻碍位错运动,合金的硬度会先出现上升,之后由于析出相的粗化使得其对回复和再结晶的阻碍作用减弱,合金的硬度下降。

The properties and microstructure evolution of the cold rolled Al-0. 04 Er and Al-0. 08 Zr alloys were investigated during annealing for different time. The results indicate that the influence of Er element on electrical conductivity of Al matrix is less than that of Zr element with the same concentration. Moreover,Er element can precipitate out thoroughly after annealing and has less influence on the conductivity,so the electrical conductivity of the Al-Er alloy is higher than that of the Al-Zr alloy. For the Al-Zr alloy,the electrical conductivity increases with the precipitation of Zr atoms,but the hardness decreases due to recovery and recrystallization of the cold rolled microstructure. For the Al-Er alloy,both electrical conductivity and hardness increase with the increased of annealing time during the early stage of the annealing treatment. With further increase of the annealing time,the electrical conductivity increases,while the hardness decreases due to the coarsening of the precipitates and the succedent recovery and recrystallization.