Research Progress and Prospect of Grain Refinement Technology for Al-Si Alloys
Al-Si alloys exhibit excellent casting performance,high strength and hardness,desirable wear and process-ing performance,which are widely used in equipment manufacturing,5G communication and other fields.In recent years,higher requirements are put forward for the strength and plasticity of Al-Si alloys in the manufacturing industries such as automobiles,high-speed rail,3C,etc.Developing fine-grained Al-Si alloys to simultaneously improve the strength and plasticity is the current research focus.However,the commercial grain refiners suffer from Si poisoning,which becomes more severe with Si content increase,and even leads to the complete failure of refiners with α-Al grains reaching centimeter level accompanied by abnormal structures such as feather grains.In addition,the nucleated particles are prone to settling and agglomeration in the melt,and the degree of refinement fading intensifies with pro-longed holding time.On this basis,the research status and existing problems of grain refiners for Al-Si alloys were summarized.The characteristics and advantages of novel anti Si-poisoning Al-TCB seed alloys were emphasized,and grain refinement technologies of Al-Si alloys were prospected.
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