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.
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页数：12
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