Mechanical properties and fracture mechanism of as-cast Mg77TM12Zn5Y6 (TM = Cu, Ni) bulk amorphous matrix composites
Mechanical properties and fracture mechanism of as-cast Mg77TM12Zn5Y6 (TM = Cu, Ni) bulk amorphous matrix composites
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DOI：
10.1016/j.jallcom.2008.11.048
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发表时间：
2009-06
影响因子：
6.2
通讯作者：
K. Qiu;N. Hu;H. B. Zhang;W. Jiang;Y. Ren;P. Liaw
中科院分区：
文献类型：
--
作者：
K. Qiu;N. Hu;H. B. Zhang;W. Jiang;Y. Ren;P. Liaw
采用扫描电镜（SEM）、DSC和压缩试验机对mg77cu12zn5y6和mg77ni12zn5y6块体金属玻璃基复合材料的显微组织、热稳定性和力学性能进行了对比研究。结果表明：直径为3mm的含cu合金铸态试样在非晶基体中由Mg薄片和点状Mg2Cu相组成，而相同直径的铸态含ni合金则主要由非晶基体中的Mg薄片组成。含cu非晶基复合材料的玻璃化转变温度为413K，过冷液区为27K，含ni非晶基复合材料的过冷液区为443K，过冷液区为32K。含cu合金的断裂强度为532MPa，屈服强度为390MPa，塑性应变为2.4%；含ni合金的断裂强度为667MPa，屈服强度为412MPa，塑性应变为7%。从断口形貌和应力-应变曲线两方面探讨了非晶基复合材料的断裂机理。
Comparative investigations on the microstructures, thermal stability and mechanical properties of Mg77Cu12Zn5Y6and Mg77Ni12Zn5Y6bulk metallic glass matrix composites were carried out by using scanning electron microscopy (SEM), DSC and compressive tester. The results show that the microstructure of as-cast samples with 3mm in diameter for Cu-containing alloy is consisted of Mg flakes and dotted Mg2Cu phase in the amorphous matrix, while the as-cast Ni-containing alloy with the same diameter is mainly consisted of Mg flakes in the amorphous matrix. The glass transition temperature and supercooled liquid region are 413K and 27K for the Cu-containing, 443K and 32K for the Ni-containing amorphous matrix composites, respectively. The fracture strength, yield strength and plastic strain are 532MPa, 390MPa and 2.4% for the Cu-containing alloy, 667MPa, 412MPa and 7% for the Ni-containing alloy, respectively. Furthermore, the fracture mechanism for the amorphous matrix composites was discussed according to both the fracture surfaces and the stress–strain curves.