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首页> 外文期刊>Metals >Optimization of A354 Al-Si-Cu-Mg Alloy Heat Treatment: Effect on Microstructure, Hardness, and Tensile Properties of Peak Aged and Overaged Alloy
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Optimization of A354 Al-Si-Cu-Mg Alloy Heat Treatment: Effect on Microstructure, Hardness, and Tensile Properties of Peak Aged and Overaged Alloy

机译：A354 Al-Si-Cu-Mg合金热处理工艺的优化：对峰值时效和过时效合金的组织，硬度和拉伸性能的影响

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The aim of the present work is the study of T6 heat treatment of A354 (Al-Si-Cu-Mg) casting alloy. The heat treatment was optimized by maximizing mechanical strength of the alloy while keeping the treatment cost effective, reducing treatment time and temperature. Due to the presence of low melting compounds, a double stage solution treatment was proposed. The first stage was aimed at the homogenization and dissolution of the low melting phase while a second stage at a higher temperature was evaluated to foster dissolution of Cu/Mg rich intermetallics and keep the solution time and temperature as low as possible. Microstructural investigations were performed through optical and electronic microscopy, which allowed the assessment of the evolution of intermetallic phases during the solution treatment. Artificial aging was studied at different temperatures from 160 °C to 210 °C where the peak aging condition was identified. Over aging of the heat treated alloy was evaluated by soaking T6 samples at 200, 245, and 290 °C for up to 168 h. Tensile behavior of the T6 and over-aged alloy (i.e., after soaking at 210 °C for 50 h) was evaluated at room temperature. Results showed that the proposed treatment allowed the enhancement of mechanical properties of the alloy in comparison to industrial practice treatment, maintaining a good level of ductility and conferring a superior resistance to long-term high temperature exposure.
机译：本工作的目的是研究A354（Al-Si-Cu-Mg）铸造合金的T6热处理。通过在保持处理成本有效，减少处理时间和温度的同时最大化合金的机械强度来优化热处理。由于存在低熔点化合物，因此提出了双阶段固溶处理。第一阶段旨在低熔点相的均质化和溶解，而第二阶段则在较高温度下进行评估，以促进富Cu / Mg的金属间化合物的溶解并保持溶解时间和温度尽可能低。通过光学和电子显微镜进行了显微结构研究，从而可以评估固溶处理过程中金属间相的演变。在160°C至210°C的不同温度下研究了人工老化，可以确定峰值老化条件。通过将T6样品在200、245和290°C下浸泡长达168小时来评估热处理合金的过时效。在室温下评价T6和过时效合金的拉伸行为（即在210℃下均热50小时后）。结果表明，与工业实践处理相比，拟议的处理可以提高合金的机械性能，保持良好的延展性，并具有优异的耐长期高温暴露能力。

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