A review of the origin of equiaxed grains during solidification under mechanical stirring,vibration,electromagnetic,electric-current,and ultrasonic treatments

查看全文 作　　者：Nagasivamuni [1]Balasubramani;Jeffrey [1]Venezuela;David [1]StJohn;Gui [1]Wang;Matthew [1]Dargusch

机构地区：[1]Centre for Advanced Materials Processing and Manufacturing(AMPAM),School of Mechanical and Mining Engineering,University of Queensland,St.Lucia,QLD 4072,Australia

出　　处：《Journal of Materials Science & Technology》索引2023年第13期,共23页

基　　金：support provided by the Australian Research Council Research Hub for Advanced Manufacturing of Medical Devices (No.IH150100024);the ARC Discovery (No.DP140100702)and the ARC linkage project (No.LP150100950). 摘　　要：Refinement of grains and intermetallic phases in the as-solidified alloy structure offers uniform struc-tural properties,eliminates or minimizes common solidification defects,including segregation and hot cracking,and improves thermomechanical processing of wrought alloys.Melt processing by an external field is an efficient process for achieving refinement of the solidification structure of Al and Mg alloys without altering the alloy composition.A wide range of melt processing methods and solidification stud-ies(conventional,directional,and in-situ approaches)have been reported in the literature that explore the mechanism of refinement.Identifying the dominant grain refinement mechanism has been a focus of most investigations because significant variations exist according to the casting conditions and the type of applied external treatments.The origin of fine grains occurs through either one or a combination of heterogenous nucleation,fragmentation of dendrites and grains formed and then separated from the surface of the melt and mould wall under vibration or agitation.The first part of this review describes the prominent external field techniques and the mechanisms proposed for the origin of fine grains.The second part critically compares the current understanding of these grain refinement mechanisms to de-termine differences and commonalities to identify the factors that promote the formation of equiaxed zones occupying a large volume fraction of the casting. 关键词：Grain refinement SOLIDIFICATION Melt processing Equiaxed grains Intermetallic refinement

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A review of the origin of equiaxed grains during solidification under mechanical stirring,vibration,electromagnetic,electric-current,and ultrasonic treatments

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