Characteristic and mechanical properties of magnesium matrix composites reinforced with Mg₂B₂O₅w and B₄Cp

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• 作者：Jianguo Li ; ^{lijianguo369@sjtu.edu.cn} ; Feifei Wang ; Wei Weng ; Yijie Zhang ; Mingliang Wang ; Haowei Wang ; ^{hwwang@sjtu.edu.cn}
• 刊名：Materials and Design
• 出版年：2012
• 出版时间：May, 2012
• 年：2012
• 卷：37
• 期：Complete
• 页码：533-536
• 全文大小：730 K

文摘

Squeeze casting technique was used to fabricate Mg₂B₂O₅w/AZ91D singular composite and (Mg₂B₂O₅w + B₄Cp)/AZ91D hybrid composite to study the effect of Mg₂B₂O₅w and B₄Cp hybrid reinforcements on magnesium alloy. The microstructure, mechanical properties and fracture features of the composites were investigated. The results show that the additions of Mg₂B₂O₅w and B₄Cp can remarkably enhance the flexural properties of the composites. Especially, B₄Cp has a larger contribution to the flexural strength and flexural modulus of the hybrid composite. The flexural strength of the hybrid composite is 29 % higher than that of the singular composite. The reason can be ascribed to the higher dislocation density in the matrix of the hybrid composite due to larger differences in the elastic modulus and CETs between B₄Cp and the matrix than those between Mg₂B₂O₅w and the matrix. On the fractured surfaces of the composites, most of Mg₂B₂O₅w and B₄Cp fracture in the matrix, suggesting that the interfacial bonding strength between the reinforcements and the matrix is relatively strong.