Effect of extrusion on the microstructure and mechanical properties of a low-alloyed Mg-2Zn-0.8Sr-0.2Ca matrix composite reinforced by TiC nano-particles  

作　　者：Zedong Wang Kaibo Nie Kunkun Deng Jungang Han 

机构地区：[1]College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China [2]Shanxi Key Laboratory of Advanced Magnesium-based Materials,Taiyuan University of Technology,Taiyuan 030024,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2022年第11期1981-1990,共10页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51771129, 51401144, and 51771128);the Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi, China;the Natural Science Foundation of Shanxi Province, China (Nos. 2015021067 and 201601D011034);the Projects of International Cooperation in Shanxi, China (No. 2017 03D421039)

摘　　要：A low-alloyed Mg-2Zn-0.8Sr-0.2Ca matrix composite reinforced by TiC nano-particles was successfully prepared by semi-solid stirring under the assistance of ultrasonic,and then the as-cast composite was hot extruded.The results indicated that the volume fraction of dynamical recrystallization and the recrystallized grain size have a certain decline at lower extrusion temperature or rate.The finest grain size of~0.30μm is obtained in the sample extruded at 200℃ and 0.1 mm/s.The as-extruded sample displays a strong basal texture intensity,and the basal texture intensity increases to 5.937 mud while the extrusion temperature increases from 200 to 240℃.The ultra-high mechanical properties(ultimate tensile strength of 480.2 MPa,yield strength of 462 MPa)are obtained after extrusion at 200℃ with a rate of 0.1 mm/s.Among all strengthening mechanisms for the present composite,the grain refinement contributes the most to the increase in strength.A mixture of cleavage facets and dimples were observed in the fracture surfaces of three as-extruded nanocomposites,which explain a mix of brittle-ductile fracture way of the samples.

关 键 词：magnesium matrix composite EXTRUSION microstructure and mechanical properties TEXTURE FRACTURE 

分 类 号：TG376[金属学及工艺—金属压力加工] TB333[一般工业技术—材料科学与工程]