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OALib Journal期刊
ISSN: 2333-9721
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挤压铸造SiC/ZL109铝合金双连续相复合材料的凝固组织
, PP. 325-330
Keywords: 双连续相复合材料,工艺参数,碳化硅泡沫,凝
Abstract:
用挤压铸造法制备了SiC/Al双连续相复合材料，研究了工艺参数和SiC泡沫增强体对基体凝固组织的影响，以及复合材料的凝固机制。结果表明，工艺参数对复合参数材料凝固组织有重要的影响。正压加压制备的复合材料组织比反压加压均匀，提高复合压力可以细化基体的组织，但效果不明显。随着SiC泡沫增强体预热温度的降低，基体中？α－Al柱状枝晶晶粒逐渐减小。SiC泡沫增强体对基体的晶粒尺寸没有明显的影响，但是改变了晶粒的形态。泡沫孔内的？α-Al初晶表现为粗大的柱状晶，其方向垂直于泡沫增强体的筋。泡沫孔的尺寸越小，越容易形成枝晶组织，枝晶的方向性越强。SiC/Al双连续相复合材料基体凝固时，？α－Al首先在泡沫筋的附近形核，然后逐渐向泡沫孔的中心长大。？α－Al枝晶形成轮廓以后，中心富硅区发生共晶反应，形成筋表面的共晶硅。
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