Effect of Microalloying on Hot Deformation Behavior of 8021 Aluminum Alloy

IF 0.9 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING Russian Journal of Non-Ferrous Metals Pub Date : 2025-03-04 DOI:10.1134/S106782122460073X

Qirui Sun, Wei Wang

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Abstract

A comparative study of the hot deformation of the aluminum (8021) alloy with and without Sr addition under the conditions of deformation temperature of 350–500°C and strain rate of 0.01–10 s^–1 has been performed. The effect of adding 0.4% Sr on the microstructure of the alloy was investigated by EBSD and TEM, and the constitutive equations for the 8021 aluminum alloy with and without Sr were established. The results show that the hot activation energy decreases from 225.69 to 217.72 kJ/mol with the addition of 0.4% Sr to the alloy, which expands the safe processing range of the 8021 aluminum alloy. Compared with the alloy without Sr, the alloy with 0.4% Sr has a lower ln(Z) value. Adding Sr to the alloy decreases the density of dislocations, and it promotes the occurrence of dynamic recrystallization in the alloy, with an increase in the number of subgrains. The hot deformation behavior of the 8021 aluminum alloy is important for optimizing the alloy’s processing parameters and provides a reference for the industrial application of the 8021 aluminum alloy.

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微合金化对8021铝合金热变形行为的影响

在变形温度为350 ~ 500℃、应变速率为0.01 ~ 10 s-1的条件下，对比研究了添加Sr和不添加Sr的铝（8021）合金的热变形情况。采用EBSD和TEM研究了添加0.4% Sr对8021铝合金组织的影响，建立了添加和不添加Sr时8021铝合金的本构方程。结果表明：当合金中添加0.4% Sr时，8021铝合金的热活化能从225.69降低到217.72 kJ/mol，扩大了8021铝合金的安全加工范围；与不含Sr的合金相比，含0.4% Sr的合金的ln(Z)值更低。添加Sr降低了位错密度，促进了动态再结晶的发生，并增加了亚晶的数量。8021铝合金的热变形行为对优化8021铝合金的加工参数具有重要意义，为8021铝合金的工业应用提供参考。

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来源期刊

Russian Journal of Non-Ferrous Metals METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

1.90

自引率

12.50%

发文量

审稿时长

3 months

期刊介绍： Russian Journal of Non-Ferrous Metals is a journal the main goal of which is to achieve new knowledge in the following topics: extraction metallurgy, hydro- and pirometallurgy, casting, plastic deformation, metallography and heat treatment, powder metallurgy and composites, self-propagating high-temperature synthesis, surface engineering and advanced protected coatings, environments, and energy capacity in non-ferrous metallurgy.