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首页> 外文期刊>Materials Science and Engineering >Improvement of the tensile properties of an Al-Si-Cu-Mg aluminum industrial alloy by using multi stage solution heat treatments
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Improvement of the tensile properties of an Al-Si-Cu-Mg aluminum industrial alloy by using multi stage solution heat treatments

机译：通过多阶段固溶处理改善Al-Si-Cu-Mg铝工业合金的拉伸性能

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摘要

Novel multi-stage solution heat treatments were applied to an Al-Si-Cu-Mg industrial aluminum alloy to improve its tensile properties. Two and three-stage solution treatments were tested, varying the secondary dendritic arm spacing (SDAS) and the Sr content of the alloy. The temperature of the solution heat treatments refer to the onset temperature of incipient melting (T_(im)). In the two stage cycles proposed, the hold temperature of the first stage was always set above T_(im), while the isothermal treatment of the second stage was performed at a temperature below T_(im). This is an inverse sequence compared with the sequence used by other authors in which the solution heat treatments start below T_(im) and then increase above T_(im). It was found that with the proposed solution treatments, it was possible to obtain similar or better alloy tensile properties with shorter treatments times than the properties obtained today in industry by conventional solution treatment. For example, in the case of an alloy of 26 μm of average SDAS with 100 ppm Sr, it was found that a two-stage solution treatment cycle (4 h at 520 ℃ followed by 1 h at 490 ℃) produced better tensile properties than the conventional single stage solution cycle (5 h at 485 ℃) applied in industry, increasing the UTS, YS and elongation percentage values by 15, 10 and 82%, respectively. Even a solution treatment cycle consisting of 1 h at 530 ℃ followed by 1 h at 490 ℃ produced better tensile properties of the alloy than those obtained by the conventional industrial solution treatment in approximately half the time. In general, larger values of SDAS and higher Sr additions (200 ppm) in the alloy both resulted in a decrease in the tensile properties, primarily affecting the elongation to fracture.
机译：对Al-Si-Cu-Mg工业铝合金进行了新颖的多阶段固溶热处理，以改善其拉伸性能。测试了两阶段和三阶段固溶处理，改变了二次枝晶臂间距（SDAS）和合金的Sr含量。固溶热处理的温度是指开始熔化的开始温度（T_（im））。在建议的两阶段循环中，第一阶段的保持温度始终设置为高于T_（im），而第二阶段的等温处理则在低于T_（im）的温度下进行。与其他作者使用的顺序相反，在其他顺序中，固溶热处理开始于T_（im）以下，然后增加至T_（im）以上。已经发现，通过所提出的固溶处理，与常规的固溶处理相比，能够以更短的处理时间获得相似或更好的合金抗拉性能。例如，对于平均SDAS为26μm且Sr为100 ppm的合金，发现两阶段固溶处理循环（520℃下4 h，然后在490℃下1 h）的拉伸性能优于工业上使用常规的单阶段固溶循环（在485℃下5 h），可使UTS，YS和伸长率分别增加15％，10％和82％。即使是在530℃下进行1 h，然后在490℃下进行1 h的固溶处理循环，也比用常规工业固溶处理获得的合金在大约一半的时间内获得的抗拉性能更好。通常，合金中较大的SDAS值和较高的Sr添加量（200 ppm）都会导致拉伸性能下降，主要影响断裂伸长率。

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