In recent years,thixomolding technology has injected new vitality into the large-scale application of magnesium(Mg)alloys in multiple fields of manufacturing,promoting the lightweighting and green manufacturing of str...In recent years,thixomolding technology has injected new vitality into the large-scale application of magnesium(Mg)alloys in multiple fields of manufacturing,promoting the lightweighting and green manufacturing of structural component products.This article aims to comprehensively summarize the development and progress of Mg alloy thixomolding technology.This paper first reviews the materials including Mg alloys and Mg based composites for thixomolding applications,as well as thixomolding process including process characteristic,influence of process parameters,process defects,process optimization.Subsequently,properties of thixomolded Mg alloys and Mg based composites are discussed in detail.Then,development of thixomolding machine,progress of equipment units,advanced and large-scale thixomolding equipment are discussed.The current industrial application of Mg alloy thixomolding technology and present successful application cases are also summarized.Finally,perspectives on Mg alloy thixomolding technology in terms of developing specialized Mg alloys,technological barriers and breakthroughs,advanced thixomolding equipment,talent cultivation and sustainable development are proposed.Overall,this paper offers an in-depth insight of Mg alloy thixomolding technology,highlighting its potential in manufacturing high-performance and high-quality Mg alloy components for multiple fields.展开更多
1.Introduction Casting accounts for over 90%of magnesium-based alloy applications with die-cast and thixomolded parts dominating.The high strength-to-weight ratio coupled with excellent fluidity,low volumetric latent ...1.Introduction Casting accounts for over 90%of magnesium-based alloy applications with die-cast and thixomolded parts dominating.The high strength-to-weight ratio coupled with excellent fluidity,low volumetric latent heat and heat capacity,reduced cycle times,and low soldering tendencies,all make magnesium alloys excellent choices for die casting applications.Despite these advantages,in recent years,the use of magnesium in die casting applications has been declining.展开更多
Experimental investigation and theoretical analysis of the microstructure of thixomolded AZ91D were carried out to comprehensively understand the morphology transformation of solid particles and the solidification beh...Experimental investigation and theoretical analysis of the microstructure of thixomolded AZ91D were carried out to comprehensively understand the morphology transformation of solid particles and the solidification behavior. Typical microstructure of thixomolded AZ91D is composed of a-Mg and β-Mg17Al12, characterized with aun, aprim and eutectic. Four kinds of aun are classified according to the morphology and generation mechanism, such as spherical （al）, irregular （a2）, entrapping liquid alloy inside （a3） and entrapping pool inside （a4）. Under the effect of heating, shearing, collision, agglomeration or fragmentation, a2 and a4 can be the middle states ofal and a3. Similarly, a4 and a3 can also break into a2 and become al at the end. Controlled by undercooling, aprim nucleates and spherically grows within the remaining liquid alloy of thixomolded AZ91D until instability growth. The investigated microstructure was theoretically proved according to the analysis of Mg-Al binary phase diagram.展开更多
基金supported by the National Natural Science Foundation of China(NSFC)under Grant no.52431004.
文摘In recent years,thixomolding technology has injected new vitality into the large-scale application of magnesium(Mg)alloys in multiple fields of manufacturing,promoting the lightweighting and green manufacturing of structural component products.This article aims to comprehensively summarize the development and progress of Mg alloy thixomolding technology.This paper first reviews the materials including Mg alloys and Mg based composites for thixomolding applications,as well as thixomolding process including process characteristic,influence of process parameters,process defects,process optimization.Subsequently,properties of thixomolded Mg alloys and Mg based composites are discussed in detail.Then,development of thixomolding machine,progress of equipment units,advanced and large-scale thixomolding equipment are discussed.The current industrial application of Mg alloy thixomolding technology and present successful application cases are also summarized.Finally,perspectives on Mg alloy thixomolding technology in terms of developing specialized Mg alloys,technological barriers and breakthroughs,advanced thixomolding equipment,talent cultivation and sustainable development are proposed.Overall,this paper offers an in-depth insight of Mg alloy thixomolding technology,highlighting its potential in manufacturing high-performance and high-quality Mg alloy components for multiple fields.
文摘1.Introduction Casting accounts for over 90%of magnesium-based alloy applications with die-cast and thixomolded parts dominating.The high strength-to-weight ratio coupled with excellent fluidity,low volumetric latent heat and heat capacity,reduced cycle times,and low soldering tendencies,all make magnesium alloys excellent choices for die casting applications.Despite these advantages,in recent years,the use of magnesium in die casting applications has been declining.
基金Projects (2006BA104B04-1 2006BAE04B07-3) supported by the National Science and Technology Supporting Program of China+1 种基金Project (2007KZ05) supported by the Science and Technology Supporting Project of Changchun City, ChinaProject supported by the "985 Project" of Jilin University, China
文摘Experimental investigation and theoretical analysis of the microstructure of thixomolded AZ91D were carried out to comprehensively understand the morphology transformation of solid particles and the solidification behavior. Typical microstructure of thixomolded AZ91D is composed of a-Mg and β-Mg17Al12, characterized with aun, aprim and eutectic. Four kinds of aun are classified according to the morphology and generation mechanism, such as spherical （al）, irregular （a2）, entrapping liquid alloy inside （a3） and entrapping pool inside （a4）. Under the effect of heating, shearing, collision, agglomeration or fragmentation, a2 and a4 can be the middle states ofal and a3. Similarly, a4 and a3 can also break into a2 and become al at the end. Controlled by undercooling, aprim nucleates and spherically grows within the remaining liquid alloy of thixomolded AZ91D until instability growth. The investigated microstructure was theoretically proved according to the analysis of Mg-Al binary phase diagram.
