Microstructures and mechanical properties of quasicrystal reinforced Mg matrix composites

详细信息    查看全文

• 作者：Yingbo Zhang ; Sirong Yu ; Yulai Song ; Xianyong Zhu
• 关键词：Quasicrystals ; Metals ; Casting ; Scanning and transmission electron microscopy
• 刊名：Journal of Alloys and Compounds
• 出版年：2008
• 出版时间：22 September 2008
• 年：2008
• 卷：464
• 期：1-2
• 页码：575-579
• 全文大小：1263 K

文摘

Mg-based composites reinforced with stable in situ icosahedral quasicrystal phase (I-phase) were fabricated in this study. The effects of Y content on the microstructures and mechanical properties of the composites were investigated. The results show that the composites comprised dendrites of α-Mg matrix separated by interdendritic I-phase and lamellar (I-phase + α-Mg) eutectic. With the increase of Y content, the content of I-phase increases; the content and size of (I-phase + α-Mg) eutectic cell increase; the lamellar space between I-phase and α-Mg in eutectic cell also increases; but the grain size of α-Mg matrix decreases. The failure mode of Mg–Zn–Y alloy matrix composites in tensile tests is quasi-cleavage fracture. With the increase of Y content, the tensile strengths of the composites increase, and the elongation rates increase firstly and then decrease.