Hot rolling behaviour of stir-cast Al 6061 and Al 6082 alloys – SiC fine particulates reinforced composites
Hot rolling behaviour of stir-cast Al 6061 and Al 6082 alloys – SiC fine particulates reinforced composites
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DOI：
10.1016/j.jmatprotec.2011.10.016
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发表时间：
2012-02
影响因子：
6.3
通讯作者：
A. El-Sabbagh;M. Soliman;M. Taha;H. Palkowski
中科院分区：
文献类型：
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作者：
A. El-Sabbagh;M. Soliman;M. Taha;H. Palkowski
采用碳化硅等硬质相增强材料轧制变形铝基复合材料，具有重量轻、强度高、耐磨性好等优点，是一种很有意义的工程板材。本文研究了以Al-6061和Al-6082合金为基体，SiCp细小颗粒尺寸分别为15μm和8μm，体积分数达30%的搅拌铸造复合材料的热轧行为。对于复合铸造，采用了优化的铸造工艺和材料的前处理，使颗粒成功地插入到熔体中，改善了颗粒/基质的润湿和颗粒分布，最大限度地减少了碳化硅/铝的反应。根据热机械模拟，阶梯轧制的适宜应变速率为1s−1，每一步采用450C的中间热处理，时间为10s至1h。一般而言，随着铸件质量的提高，轧制产品的质量也随之提高。连续热轧减少了孔洞和团聚团簇，从而提高了力学性能。分析了铝颗粒金属基复合材料(PMMCs)轧制时的流动行为，并对制品的力学性能进行了表征。
Rolling of wrought aluminium matrix composites with hard phase-reinforcements such as SiC, is interesting to produce sheets for engineering constructions due to their light weight combined with good strength and wear resistance. In this work, the hot rolling behaviour is studied for stir-cast composites with matrix of Al 6061 and Al 6082 alloys and fine SiCp particulates with size of 15μm and 8μm and volume fraction up to 30%. For composite casting, optimum casting procedures and materials pre-treatment has been applied for successful insertion of particles into the melt, better particles/matrix wetting and particles distribution, minimized SiC/Al reaction. From thermomechanical simulation, step rolling is defined to be suitable at a strain rate of 1s−1rate for each step, using intermediate heat treatment at 450°C for a period of 10s to 1h. Generally, the quality of rolled product was improved with improving casting quality. Successive hot rolling resulted in decreasing void and the agglomeration clusters and hence enhanced mechanical properties are achieved. The flow behaviour under rolling of Al-particulate metal matrix composites, PMMCs, is analysed and the product is characterised for its mechanical properties.