Combined effect of high-intensity ultrasonic treatment and Ca addition on modification of primary Mg2Si and wear resistance in hypereutectic Mg-Si alloys

被引:20
作者
Moussa, M. E. [1 ]
Waly, M. A. [1 ]
El-Sheikh, A. M. [2 ]
机构
[1] Cent Met Res & Dev Inst CMRDI, Lab Foundry, Mfg Technol Dept, Halwan, Egypt
[2] Cairo Univ, Fac Engn, Dept Min Petr & Met Engn, Giza 12211, Egypt
关键词
Metals and alloys; Microstructure; Metallography; Ultrasonics; MAGNESIUM ALLOYS; MECHANICAL-PROPERTIES; GRAIN-REFINEMENT; MICROSTRUCTURE; NUCLEATION; POWER; SN;
D O I
10.1016/j.jallcom.2014.06.154
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The combined effect of high-intensity ultrasonic treatment (HIUST) and 0.3 wt.%Ca addition on modification of primary Mg2Si and wear resistance in the hypereutectic Mg-5 wt.%Si alloy has been investigated. The results show that without treatment, the dendrites of primary Mg2Si are coarse and non-uniform in size. With HIUST or 0.3 wt.%Ca addition, nearly fine uniform and polyhedral shape of primary Mg2Si are achieved. Interestingly, modification and refinement of primary Mg2Si arise from the combined effect of HIUST and 0.3 wt.%Ca addition. The sample due to combined effect of HIUST and 0.3 wt.%Ca addition has the best wear resistance due to the lowest weight loss among all the other samples for various loads (10, 30 and 50 N) at constant sliding speed (0.3 m/s). Modification mechanisms resulting in the development of microstructures are also investigated. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:576 / 581
页数:6
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