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Homogenisation Efficiency Assessed with Microstructure Analysis and Hardness Measurements in the EN AW 2011 Aluminium Alloy
Metals ( IF 2.9 ) Pub Date : 2021-07-29 , DOI: 10.3390/met11081211
Maja Vončina , Aleš Nagode , Jožef Medved , Irena Paulin , Borut Žužek , Tilen Balaško

When extruding the casted rods from EN AW 2011 aluminium alloys, not only their homogenized structure, but also their extrudable properties were significantly influenced by the hardness of the alloy. In this study, the object of investigations was the EN AW 2011 aluminium alloy, and the effect of homogenisation time on hardness was investigated. First, homogenisation was carried out at 520 °C for different times, imitating industrial conditions. After homogenisation, the samples were analysed by hardness measurements and further characterised by microscopy and image analysis to verify the influence of homogenisation on the resulting microstructural constituents. In addition, non-equilibrium solidification was simulated using the program Thermo-Calc and phase formation during solidification was investigated. The homogenisation process enabled more rounded shape of the Al2Cu eutectic phase, equilibrium formation of the phases, and the precipitation in the matrix, leading to a significant increase in the hardness of the EN AW 2011 aluminium alloy. The experimental data revealed a suitable homogenisation time of 4–6 h at a temperature of 520 °C, enabling optimal extrusion properties.

中文翻译:

使用 EN AW 2011 铝合金的微观结构分析和硬度测量评估均质化效率

当从 EN AW 2011 铝合金挤压铸棒时,不仅它们的均质结构,而且它们的可挤压性能都受到合金硬度的显着影响。在本研究中,研究对象是 EN AW 2011 铝合金,研究了均质化时间对硬度的影响。首先,模仿工业条件,在 520°C 下进行不同时间的均质化。均质化后,样品通过硬度测量进行分析,并通过显微镜和图像分析进一步表征,以验证均质化对所得微观结构成分的影响。此外,使用 Thermo-Calc 程序模拟了非平衡凝固,并研究了凝固过程中的相形成。2 Cu 共晶相、相的平衡形成以及基体中的析出,导致 EN AW 2011 铝合金的硬度显着增加。实验数据表明,在 520°C 的温度下,合适的均质时间为 4-6 小时,从而实现最佳挤出性能。
更新日期:2021-07-30
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