半固态铝合金智能压缩试验中液相偏析的控制

C. Kang, K. Jung, H. Jung
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引用次数: 7

摘要

触变成形技术在近净形状零件的制造中越来越受欢迎,与传统的成形技术相比,触变成形技术具有许多优点,已在世界范围内得到推广和研究。半固态成形工艺生产的零件具有良好的力学性能和较少的气孔等缺陷。在半固态成形过程中,应力与染色之间的关系对模具的设计是非常重要的,以避免产品的缺陷。由于合金中的液体是共晶成分,液体偏析会导致严重的或不希望出现的情况。本实验使用的材料为采用电磁搅拌工艺制备的A357、A390、Al2024合金。在半固态材料的压缩试验中,液相与球化的固体颗粒共存。由感应加热系统控制与所期望的固体分数相对应的坯料温度。智能压缩试验采用感应加热和MTS技术,压缩过程中连续测量试样温度。在压缩过程中,液体偏析受应变速率和固相含量变化的控制。研究了考虑液体偏析的固液两相流动特性。一般来说,我们知道,如果施加在半固态合金上的应力低于屈服应力,合金就会表现出类似固体的行为,但如果施加在半固态合金上的应力超过屈服应力,合金就会像液体一样流动。因此,建立屈服点是预测半固态合金流变行为的重要手段。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Control of liquid segregation of semi-solid aluminum alloys during intelligent compression test
Thixoforming is becoming increasingly popular for manufacturing near-net shape parts and has so many advantages compared with conventional forming technologies that it has spread and been studied worldwide. Components produced by semi-solid forming process have good mechanical properties and less defects such as porosity. A relationship between stress and stain is very important to design a die to avoid defects of products during semi-solid forming process. Since the liquid will be of eutectic composition in alloys, liquid segregation will result in significant or undesirable situations. The materials used in this experiment are A357, A390, Al2024 alloys that have been fabricated by the electromagnetic stirring process. In the compression test with the semi-solid state materials the liquid phase coexists with globularized solid particles. Billet temperature corresponding to the desired solid fraction is controlled by an induction heating system. The intelligent compression test was performed by induction heating and MTS. During compression, specimen temperatures were continuously measured. The liquid segregation is controlled by changes in the strain rate and solid fraction during the compression process. The characteristics of flow between solid and liquid phase considering liquid segregation is examined. Generally, it is known that if the applied stress to semi-solid alloys is below the yield stress, the alloys show solid-like behavior but, if the applied stress exceeds the yield stress, the semi-solid alloys flow like liquid. Therefore, it is important to establish the yield point to predict the rheological behavior of semi-solid alloys.
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