Abstract

The evolution of the microstructure and mechanical properties of quasibinary Al–6.5Cu–2.3Y and Al–6Cu–4.05Er alloys during homogenization and subsequent thermomechanical treatment has been studied in this work. The Cu concentration in the aluminum solid solution increases during homogenization before quenching owing to the dissolution of a nonequilibrium excess of phases of crystallization origin and is 1.8 and 2.3% for the alloys containing Y and Er, respectively. The size of intermetallic phases in the Al–6.5Cu–2.3Y and Al–6Cu–4.05Er alloys homogenized at 605°С for 3 hours is 1.2 and 0.75 μm, respectively, and does not increase significantly with an increased annealing time. The Al–6Cu–4.05Er alloy is less prone to softening during annealing after rolling than the Y-containing alloy. This is explained by a greater degree of alloying of the aluminum solid solution (Al) and by a greater degree of dispersity of phases of crystallization origin. However, because of the same factor, the Er-containing alloy has a higher inclination to recrystallization and thereby a coarser recrystallized grain. As a result, the Al–6Cu–4.05Er alloy demonstrates higher mechanical tensile characteristics, especially after annealing at temperatures above 150°С.

中文翻译：

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准二元Al–6.5Cu–2.3Y和Al–6Cu–4.05Er合金的组织和性能比较分析

摘要

在这项工作中，研究了准二元Al–6.5Cu–2.3Y和Al–6Cu–4.05Er合金在均质化和随后的热机械处理过程中的组织和力学性能的演变。铝固溶体中的铜浓度在淬火前的均质化过程中会增加，这是由于非平衡过量的结晶起源相的溶解所致，对于含Y和Er的合金，其浓度分别为1.8％和2.3％。在605°С均质3小时的Al–6.5Cu–2.3Y和Al–6Cu–4.05Er合金中金属间相的大小分别为1.2和0.75μm，并且不会随着退火时间的增加而显着增加。与含Y合金相比，Al-6Cu-4.05Er合金在轧制后的退火过程中不易软化。这可以通过铝固溶体（Al）的合金化程度更高以及结晶起源相的分散度更高来解释。然而，由于相同的因素，含Er的合金具有更高的重结晶倾向，并因此具有较粗的重结晶晶粒。结果，Al-6Cu-4.05Er合金表现出更高的机械拉伸特性，尤其是在高于150°С的温度退火之后。