교반주조 및 압연공정으로 제조된 B4C/Al6061 금속복합재료의 마모 및 기계적 특성 연구
Wear and Mechanical Properties of B4C/Al6061 Composites Fabricated by Stir Casting and Rolling Process
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초록
본 연구에서는 교반주조 공정을 통해 B4C 입자가 균일하게 분산된 알루미늄 금속복합재료를 제조하고 후공정으로 열간압연을 수행하였다. 제조된 복합재료의 미세조직, 기계적 특성 및 내마모 특성에 대해 분석하였다. 40 μm 크기의 B4C 입자가 균일하게 분산된 복합재료는 강화재의 체적율이 증가함에 따라 인장강도는 증가하였으며, 마모 성능도 개선되었다. 20 vol.% 복합재료의 경우 인장강도 값은 292 MPa로 기지재인 Al6061 대비 155% 증가하였다. 내마모시험 결과 20 vol.% 복합재료의 경우 마모 너비와 깊이가 각각 856 μm, 36 μm이며, 마찰계수는 0.382 로 Al6061 대비 상당히 우수한 내마모 특성을 나타내었다.
Abstract
In this study, aluminum (Al) alloy matrix composites in which B4C particles were uniformly dispersed was manufactured through stir casting followed by hot rolling process. The microstructure, mechanical properties, and wear resistance properties of the prepared composites were analyzed. The composite in which the 40 μm sized B4C particles were uniformly dispersed increased the tensile strength and improved wear performance as the volume ratio of the reinforcement increased. In the case of the 20 vol.% composite, the tensile strength was 292 MPa, which was 155% higher than that of the Al6061. As a result of the wear resistance test, the wear width and depth of the 20 vol.% B4C/Al6061 composites were 856 μm, and 36 μm, and the friction coefficient was 0.382, which were considerably superior to Al6061.
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