This paper summarizes the melting and casting processes for magnesium alloys.It also reviews the historical development of magnesium castings and their structural uses in the western world since 1921 when Dow began pr...This paper summarizes the melting and casting processes for magnesium alloys.It also reviews the historical development of magnesium castings and their structural uses in the western world since 1921 when Dow began producing magnesium pistons.Magnesium casting technology was well developed during and after World War II,both in gravity sand and permanent mold casting as well as high-pressure die casting,for aerospace,defense and automotive applications.In the last 20 years,most of the development has been focused on thin-wall die casting applications in the automotive industry,taking advantages of the excellent castability of modern magnesium alloys.Recently,the continued expansion of magnesium casting applications into automotive,defense,aerospace,electronics and power tools has led to the diversification of casting processes into vacuum die casting,low-pressure die casting,squeeze casting,lost foam casting,ablation casting as well as semi-solid casting.This paper will also review the historical,current and potential structural use of magnesium with a focus on automotive applications.The technical challenges of magnesium structural applications are also discussed.Increasing worldwide energy demand,environment protection and government regulations will stimulate more applications of lightweight magnesium castings in the next few decades.The development of use of Integrated Computational Materials Engineering(ICME)tools will accelerate the applications of magnesium castings in structural applications.展开更多
The research and development status of casting magnesium alloys including the commercial casting alloys and the new types casting alloys are reviewed,with more attention to microstructure and mechanical properties of ...The research and development status of casting magnesium alloys including the commercial casting alloys and the new types casting alloys are reviewed,with more attention to microstructure and mechanical properties of modified-AZ91,AM60 and WE43 alloys with various additions,and new types of low cost casting alloys and high strength casting alloys.The modification and/or refinement of Mg2 Si phase in Mg-Al-Si based casting alloys by various additions are discussed and new purifying technologies for casting magnesium alloys are introduced to improve the performance.The modified AZ81 alloy with reduced impurities is found to have the tensile strength of 280 ± 6 MPa and elongation of 16% ± 0.7%.The fatigue strength of AZ91 D alloy could be obviously improved by addition of Ce and Nd.The Mg-16Gd-2Ag-0.3Zr alloy exhibits very high tensile and yield strengths（UTS：423 MPa and YS：328 MPa）;however,its elongation still needs to be improved.展开更多
文摘This paper summarizes the melting and casting processes for magnesium alloys.It also reviews the historical development of magnesium castings and their structural uses in the western world since 1921 when Dow began producing magnesium pistons.Magnesium casting technology was well developed during and after World War II,both in gravity sand and permanent mold casting as well as high-pressure die casting,for aerospace,defense and automotive applications.In the last 20 years,most of the development has been focused on thin-wall die casting applications in the automotive industry,taking advantages of the excellent castability of modern magnesium alloys.Recently,the continued expansion of magnesium casting applications into automotive,defense,aerospace,electronics and power tools has led to the diversification of casting processes into vacuum die casting,low-pressure die casting,squeeze casting,lost foam casting,ablation casting as well as semi-solid casting.This paper will also review the historical,current and potential structural use of magnesium with a focus on automotive applications.The technical challenges of magnesium structural applications are also discussed.Increasing worldwide energy demand,environment protection and government regulations will stimulate more applications of lightweight magnesium castings in the next few decades.The development of use of Integrated Computational Materials Engineering(ICME)tools will accelerate the applications of magnesium castings in structural applications.
基金supported by the National Natural Science Foundation of China(Grant Nos.51531002,51474043 and 51571043)the Ministry of Education of China(SRFDR 20130191110018)+1 种基金Chongqing Municipal Government(CSTC2013JCYJC60001,CEC project,Two River Scholar Project and The Chief Scientist Studio Project)Fundamental Research Funds for the Central Universities(No.106112015CDJZR135515)
文摘The research and development status of casting magnesium alloys including the commercial casting alloys and the new types casting alloys are reviewed,with more attention to microstructure and mechanical properties of modified-AZ91,AM60 and WE43 alloys with various additions,and new types of low cost casting alloys and high strength casting alloys.The modification and/or refinement of Mg2 Si phase in Mg-Al-Si based casting alloys by various additions are discussed and new purifying technologies for casting magnesium alloys are introduced to improve the performance.The modified AZ81 alloy with reduced impurities is found to have the tensile strength of 280 ± 6 MPa and elongation of 16% ± 0.7%.The fatigue strength of AZ91 D alloy could be obviously improved by addition of Ce and Nd.The Mg-16Gd-2Ag-0.3Zr alloy exhibits very high tensile and yield strengths（UTS：423 MPa and YS：328 MPa）;however,its elongation still needs to be improved.
