Abstract

This study is focused on the design of new Al–Cu–Mn alloys with enhanced strength and heat resistance achieved without high-temperature exposure. There are seven alloys considered with permanent Mn content of 2% and variable Cu content of 0–4%. It is found that ~2% Mn is almost completely dissolved in the solid solution after casting, while the copper is distributed between the solid solution and Al₂Cu eutectic constituents. It is experimentally established that, when the copper content is 2 and 3%, the solid solution of aluminum contains approximately the same amount of copper, up to 1.5%. The deformation plasticity of experimental alloys in the cold rolling mode with the reduction rate of 80 and 95% is investigated. It is shown that no preliminary treatment is required for alloys containing up to 3% Cu, as they exhibit high processability at rolling. The effect of heat treatment in the annealing temperature range of 200–600°C on the structural and phase parameters of the alloys is studied. Alloy hardening in the process of multistage annealing by means of hardness measurement is estimated. The resulting data allow us to determine the influence of copper and analyze the thermal stability of the model alloys. Tensile tests of cold-rolled sheets with a thickness of 0.5 mm and a reduction level of 95% of alloys containing 2 and 3% copper show high values. In particular, the alloy containing 3% Cu has a strength performance compatible with that of 1201 alloy in T6 condition.

中文翻译：

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铜浓度和退火温度对 Al-2% Mn 合金钢锭和冷轧薄板组织和力学性能的影响

摘要

本研究的重点是设计新的 Al-Cu-Mn 合金，无需高温暴露即可实现增强的强度和耐热性。有 7 种合金被认为具有 2% 的永久 Mn 含量和 0-4% 的可变 Cu 含量。发现铸造后~2%的Mn几乎完全溶解在固溶体中，而铜分布在固溶体和Al _2之间铜共晶成分。实验证明，当铜含量为2%和3%时，铝的固溶体中含铜量大致相同，最高可达1.5%。研究了压下率为 80% 和 95% 的冷轧模式下实验合金的变形塑性。结果表明，铜含量不超过 3% 的合金不需要预处理，因为它们在轧制时表现出高加工性。研究了200~600℃退火温度范围内热处理对合金组织和相参数的影响。采用硬度测量方法估计多级退火过程中的合金硬化。所得数据使我们能够确定铜的影响并分析模型合金的热稳定性。厚度为 0.5 毫米、还原度为 95% 的含 2% 和 3% 铜合金的冷轧板的拉伸试验显示出高值。特别是含3%Cu的合金在T6条件下的强度性能与1201合金相匹配。