Strength and elastic modulus enhancement in Mg-Li-Al matrix composites reinforced by ex situ TiB2 particles via stir casting  

作　　者：Jiawei Sun Dehua Ding Wencai Liu Guohua Wu Hongjie Liu Guangling Wei Hezhou Liu 

机构地区：[1]National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Magnesium and Alloys》2024年第9期3574-3588,共15页镁合金学报（英文）

基　　金：supported by the National Natural Science Foundation of China(Nos.51821001 and U2037601);Major Scientific and Technological Inno-vation Projects in Luoyang(No.2201029A);Foundation Strengthening Plan Technical Field Fund(No.2021-JJ-0112);Shanghai Jiao Tong University Student Innovation Prac-tice Program(No.IPP24076).

摘　　要：A novel Mg^(-1)0Li-3Al(wt.%,LA103)matrix composite reinforced by ex situ micron TiB_(2) particles was developed in the present study.The ball milling and cold pressing pretreatment of the reinforcements made it feasible to prepare this material under stir casting conditions with good dispersion.The microstructure and mechanical properties of the composites prepared by different pretreatment methods were analyzed in detail.The TiB_(2) particles in the Al-TiB_(2)/LA103 composite using the pretreatment process were uniformly distributed in the microstructure due to the formation of highly wettable core-shell units in the melt.Compared with the matrix alloys,the Al-TiB_(2)/LA103 composite exhibited effective strength and elastic modulus improvements while maintaining acceptable elongation.The strengthening effect in the composites was mainly attributed to the strong grain refining effect of TiB2.This work shows a balance of high specific modulus(36.1 GPa·cm^(3)·g^(-1))and elongation(8.4%)with the conventional stir casting path,which is of considerable application value.

关 键 词：Mg-Li composite Stir casting Elastic modulus Microstructure Mechanical properties 

分 类 号：TB33[一般工业技术—材料科学与工程]