Retrogression and reaging — aluminum alloy AA7012

IF 3.4 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Mechanical and Materials Engineering Pub Date : 2025-04-24 DOI:10.1186/s40712-025-00269-w

Luiz Antonio Azevedo Rosa, Luis Rogerio de Oliveira Hein, Marcos Valério Ribeiro

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Abstract

Retrogression and reaging (RRA) is of interest to the automotive industry for manufacturing components of high-strength aluminum alloys. This study describes obtaining the retrogression and reaging curve for the aluminum alloy AA7012-T6 (Al–Zn–Mg–Cu) — UNS A97012. The RRA heat treatment consists of two stages: the first stage is retrogression, which was carried out on samples in the T6 hardening condition for a time ranging from 5 s to 4 h at different temperatures: 180 °C, 210 °C, and 240 °C. The second stage, reaging, was conducted at 120 °C for 24 h (process parameters for obtaining the T6 temper). The RRA curve was obtained by measuring hardness Vickers (HV). The samples were also evaluated for electrical conductivity (%IACS — International Annealed Copper Standard). The best response for the RRA curve was obtained with retrogression at 180 °C/1 h and reaging at 120 °C for 24 h. The increase in hardness (HV) obtained with RRA 180 °C/1 h and reaged at 120 °C/24 h was 19%.

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回退和时效-铝合金AA7012

在制造高强度铝合金部件时，汽车工业对退变和时效（RRA）非常感兴趣。本研究获得了AA7012-T6 (Al-Zn-Mg-Cu) - UNS A97012铝合金的回归和时效曲线。RRA热处理分为两个阶段：第一阶段为回归期，在180℃、210℃、240℃的不同温度下，对处于T6硬化状态的试样进行5 s ~ 4 h的回归期。第二阶段，再时效，在120℃下进行24 h（获得T6回火的工艺参数）。通过测量硬度维氏（HV）得到RRA曲线。样品的电导率也进行了评估（%IACS -国际退火铜标准）。RRA曲线在180°C/1 h下还原，在120°C/24 h下还原，得到最佳响应。RRA在180°C/1 h下还原，在120°C/24 h下还原，硬度（HV）提高19%。

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