Tensile properties and microstructures of Al composite reinforced with BN particles
Tensile properties and microstructures of Al composite reinforced with BN particles
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DOI：
10.1016/s1359-835x(02)00011-8
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发表时间：
2002-01-01
影响因子：
8.7
通讯作者：
Kwon, H
中科院分区：
文献类型：
--
作者：
Lee, KB;Sim, HS;Kwon, H
采用无压熔渗法制备了含BN和不含BN增强的A1-4.5 wt%镁合金，并对其拉伸性能和显微组织进行了分析。由于熔融金属在氮气气氛下、800℃、1小时内发生自发渗透，因此可以制备BN增强的Al复合材料和不含BN的控制合金。对照合金的强度大幅提高与 AlN 颗粒的原位形成以及晶粒尺寸细化有关。在BN增强复合材料中，BN和Al熔体的界面反应形成了额外的AlN，并且通过原位反应形成了AlN。此外，用7.5vol％BN增强的复合材料的晶粒尺寸进一步减小至约4.0μm，并且表现出比商用合金晶粒尺寸减小约3.5倍。因此，人工添加的 BN 和 AlN 的形成（通过原位反应和界面反应）以及晶粒细化导致了复合材料的进一步强化。 (C) 2002 Elsevier Science Ltd. 保留所有权利。
A1-4.5 wt% Mg alloys reinforced with and without BN were fabricated by pressureless infiltration method and then their tensile properties and microstructures were analyzed. Since the spontaneous infiltration of molten metal occurred at a temperature of 800 degreesC for 1 h under nitrogen atmosphere, it was possible to fabricate the Al composites reinforced with BN and control alloy without BN. A large increase in strength in the case of the control alloy is related to the in situ formation of AlN particles as well as grain size refinement. In the composite reinforced with BN, additional AlN was formed by the interfacial reaction of the BN and Al melt as well as AlN by the in situ reaction. In addition, the grain size in the composite reinforced with 7.5 vol% BN further decreased to about 4.0 mum and exhibited approximately 3.5 times reduction in the grain size of the commercial alloy. Consequently, a further strengthening in the composite resulted from both the BN artificially added and AlN formation (by the in situ reaction and interfacial reaction) and grain refinement. (C) 2002 Elsevier Science Ltd. All rights reserved.