Deformation and failure behavior of heterogeneous Mg/SiC nanocomposite under compression

作     者：Xi Luo Jinling Liu Leigang Zhang Xu He Ke Zhao Linan An 

作者机构：State Key Laboratory of Traction Power&School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengduSichuan610031China Applied Mechanics and Structure Safety Key Laboratory of Sichuan ProvinceSouthwest Jiaotong UniversityChengduSichuan610031China Department of Materials Science and EngineeringUniversity of Central FloridaOrlandoFL32816United States 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2022年第10卷第12期

页      面：3433-3446页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financially supported by the National Natural Science Foundation of China (Grant No. 51871187) Department of Science and Technology of Sichuan Province (Grant No. 2020YFG0140) Fundamental Research Funds for the Central Universities (Grant No. 2682019LK04) 

主　　题：Magnesium matrix nanocomposites Heterogeneous structure Malleability Microstructural evolution 

摘      要：The heterogeneous magnesium(Mg) matrix nanocomposite with dispersed soft phase exhibits high strength and toughness. Herein, the deformation behavior and failure process were investigated to reveal the unique mechanical behavior of the heterogeneous microstructure under compression. The extensive plastic deformation is accompanied by the flattening and tilting of the soft phase, inhibiting strain localization and leading to strain hardening. Moreover, a stable crack multiplication process is activated, which endows high damage tolerance to the heterogeneous Mg matrix nanocomposites. The final failure of the composite is caused by crack coalescence in the shear plane along a tortuous path. The presence of dispersed soft phases within the hard matrix induces a noticeable change in mechanical response. Especially,the malleability of the heterogeneous Mg matrix nanocomposite is two and ten times higher than that of pure Mg and the homogeneous Mg matrix nanocomposite, respectively. The current study provides a novel strategy to break the trade-off between strength and toughness in metal matrix nanocomposites.