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Squeeze Casting Technology in Production of High-Strength Monolithic Aluminum Alloys and Aluminum Matrix Composites

机译:高强度整体铝合金及铝基复合材料生产中的挤压铸造技术

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The paper presents the results of investigation of monolithic and composite aluminum-based cast and materials with wrought alloys: AW 2024, AW 6061, AW 7075 in accordance with EN 573-3 and cast alloys AC 42100 according to EN 1706. Castings were produced using VSC 500 stand at a high squeeze pressure of 150 MPa and, for comparison, by gravity casting into permanent mold. Composite castings were performed using both commercially available ceramic preform (based on Al_2O_3 - Saffil~® fibers) and preforms produced by Institute of Foundry using high energy ball milling and mechanical alloying of ceramic substrates. The preforms are made from shot Saffil~® fibers and colloidal silica (LUDOX~®) with fillers increasing porosity. Castings made of aluminum wrought alloy after heat treatment have shown almost double increased mechanical properties. In research characterized the material properties, including the influence on pressure for microstructure, defined physical properties, namely density, electrical conductivity and thermal conductivity, coefficient of thermal expansion, as well as basic mechanical characteristics.
机译:本文介绍了整体和复合铝基铸造及具有可锻合金的材料的研究结果:符合EN 573-3的AW 2024,AW 6061,AW 7075和符合EN 1706的铸造合金AC 42100。 VSC 500处于150 MPa的高挤压压力下,并且通过比较将其重力浇铸到永久模具中。使用市售的陶瓷预成型坯(基于Al_2O_3-Saffil?纤维)和铸造研究所使用高能球磨和陶瓷基底机械合金化生产的预成型坯进行复合铸造。该预成型坯由散装的Saffil®®纤维和胶体二氧化硅(LUDOX®®)制成,填料具有增加孔隙率的作用。经过热处理的铝锻造合金制成的铸件显示出几乎两倍的机械性能提高。在研究中表征了材料特性,包括对微结构压力的影响,定义的物理特性,即密度,电导率和导热率,热膨胀系数以及基本机械特性。

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