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Effect of Ca addition on modification of primary mg_(2)si,hardness and wear behavior in mg-si hypereutectic alloys

Journal of Magnesium and alloys 2014年第3期2卷 230-238页

作者： M.E.Moussa M.A.Waly A.M.El-Sheikh Department of Manufacturing Technology Laboratory of FoundryCentral Metallurgical Research and Development Institute(CMRDI)P.O.87HalwanEgypt Department of Mining Petroleum and Metallurgical EngineeringFaculty of EngineeringCairo UniversityP.O.12613GizaEgypt

The effect of Ca addition on modification of primary mg_(2)si,hardness and wear behavior in mg-5 wt.%si hypereutectic alloy has been *** results showed clearly that without Ca addition,most of primary mg_(2)si appeared as coarse dendritic morphology with average size of about 215μ*** the addition of 0.1 wt.%Ca,the average size of primary mg_(2)si decreased to about 98μm,but their morphologies did not significantly *** the addition level of Ca increased to 0.3 wt.%,the average size of primary mg_(2)si decreased significantly to about 50μm and their morphologies changed to polyhedral ***,with further increasing Ca addition to 0.6 wt.%and 1 wt.%,some needle-like and blocky Camgsi particles formed and the average size of primary mg_(2)si increased slightly,which could described as *** present work showed that the optimal modification effect could be obtained when the Ca content in the investigated alloy reached 0.3 wt.%.The modification mechanism may be referred mainly due to poisoning effect resulting from the segregation of Ca atoms at the growth front of the mg_(2)si and the adsorption effect of some Ca atoms in the mg_(2)si crystal growth *** 0.3 wt.%Ca-added alloy has the highest hardness value and the best wear resistance among all other *** excessive Ca addition resulted in the formation of some needle-like and blocky Camgsi particles,which was detrimental to hardness and wear behavior of the 0.6 wt.%and 1 wt.%Ca-added *** wear mechanism of investigated alloys is a mild abrasive oxidative wear with little adhesion.

关键词： mg-si alloys Modification Ca addition Hardness Wear

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