Regulating the bimodal structure and strength-ductility synergy of Zn-decorated Ti particles reinforced AZ91 composite through high-volume fraction Mg17Al12 precipitations

被引：6

作者：

Zhang, Yuhui ^{[1
,2
]}

Han, Shengli ^{[1
]}

Chen, Pengju ^{[1
]}

Xia, Jun ^{[1
]}

Li, Jianbo ^{[2
]}

She, Jia ^{[2
]}

Chen, Xianhua ^{[2
]}

Zheng, Kaihong ^{[1
]}

Pan, Fusheng ^{[2
]}

机构：

[1] Guangdong Acad Sci, Inst New Mat, Natl Titanium & Rare Met Powder Met Engn Technol R, Key Lab Met Strengthening & Toughening Technol & A, Guangzhou 510651, Peoples R China

[2] Chongqing Univ, Natl Engn Res Ctr Magnesium Alloys, Sch Mat Sci & Engn, Chongqing 40044, Peoples R China

来源：

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2024年 / 185卷

关键词：

A. Metal-matrix composites (MMCs); A; Particle-reinforcement; B. Mechanical properties; E. Powder processing; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; TEXTURE EVOLUTION; MAGNESIUM ALLOY; SOLID-SOLUTION; MG MATRIX; ZR ALLOY; AS-CAST; MICROSTRUCTURE; INTERFACE;

D O I：

10.1016/j.compositesa.2024.108376

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, Mg-9Al-1Zn (AZ91) alloy reinforced with zinc-decorated titanium (Zn@Ti) particles was fabricated using the powder metallurgy method. Zn nanoparticles effectively dissolved into magnesium (Mg) matrix, which led to a reduction in the solid solubility of aluminum (Al) and precipitations of submicron sized Mg17Al12. 17 Al 12 . As a result, the Zn@Ti/AZ91 composite displays a bimodal grain structure, achieving a remarkable balance between strength and ductility, with a yield strength of 248 +/- 3.5 MPa, an ultimate tensile strength of 378 +/- 5.3 MPa, and an elongation of 15.0 +/- 2.8 %. The improved strength of Zn@Ti/AZ91 composite primarily stems from the synergistic effect of a significant volume fraction of submicron sized Mg17Al12 17 Al 12 and Al8Mn5 8 Mn 5 precipitations strengthening, Zn solid solution strengthening, and grain boundary strengthening. Regarding ductility mechanisms, the presence of Mg17Al12 17 Al 12 and Al8Mn5 8 Mn 5 precipitations effectively impede crack propagation and enhance ductility. This innovative approach represents a promising strategy for developing high strength and ductility of Mg composites.

引用

页数：12

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