Effects of A-site atoms in Ti2AlC and Ti3SiC2 MAX phases reinforced Mg composites: Interfacial structure and mechanical properties

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:826

Article

Yu, Wenbo¹  Pi, Xufeng¹  Chen, Wantong¹  Vallet, Maxime²  Guitton, Antoine³  Zhang, Laiqi⁴ 

[1] Beijing Jiaotong Univ, Sch Mech & Elect Control Engn, Ctr Mat Sci & Engn, Beijing 100044, Peoples R China

[2] Univ Paris Saclay, CentraleSupelec, Lab MSSMat UMR 8579 & SPMS UMR 8580, F-91190 Gif Sur Yvette, France

[3] Univ Lorraine, LEM3 & Labex Damas, CNRS, Arts & Metiers, Lorraine, France

[4] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

关键词: Casting Ti3SiC2 MAX phase;    Tensile fracture;    Microstructural observation;   

DOI  :  10.1016/j.msea.2021.141961

来源: Elsevier

【 摘 要 】

AZ91D magnesium composites reinforced by Ti3SiC2 MAX phase were fabricated by the stir casting technique. Tensile tests reveal that the reinforced effects of Ti3SiC2 and Ti2AlC on Mg matrix are different. Unlike Ti2AlC-AZ91D composite for which Ti2AlC delamination happens during the fracture, Ti3SiC2-AZ91D composite fractures by interfacial debonding mechanisms. Transmission electron microscopy characterization shows that few nanometric Mg grains form in the vicinity of Ti3SiC2 particles, while huge amount of nanometric Mg grains form along with Ti2AlC particles. Elements mapping confirms that Al atoms of Ti2AlC diffuse into Mg matrix. In contrast, no outward diffusion of Si of Ti3SiC2 is observed. This outcome points out that it is possible to regulate the mechanical properties of their relevant Mg composite through adjusting the content of Al and Si in MAX phases, such as Ti3SiAlC2 solid solution.

【 授权许可】

Free