Scholarlink

<p>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&#xa0;s to 4&#xa0;h at different temperatures: 180&#xa0;°C, 210&#xa0;°C, and 240&#xa0;°C. The second stage, reaging, was conducted at 120&#xa0;°C for 24&#xa0;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&#xa0;°C/1&#xa0;h and reaging at 120&#xa0;°C for 24&#xa0;h. The increase in hardness (HV) obtained with RRA 180&#xa0;°C/1&#xa0;h and reaged at 120&#xa0;°C/24&#xa0;h was 19%.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Retrogression and reaging — aluminum alloy AA7012

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年4月24日

查看全文
  • Luiz Antonio Azevedo Rosa,
  • Luis Rogerio de Oliveira Hein,
  • Marcos Valério Ribeiro

摘要

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%.