High strength-ductility synergy of MgAlB4 whisker reinforced aluminum matrix composites achieved by in situ synthesis

被引：14
作者：
Li, Jun [1 ]
Wang, Fucheng [1 ]
Shi, Chunsheng [1 ,2 ]
Liu, Enzuo [1 ,2 ]
He, Chunnian [1 ,2 ]
Zhao, Naiqin [1 ,2 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin Key Lab Composite & Funct Mat, Tianjin 300350, Peoples R China
[2] Tianjin Univ, Key Lab Adv Ceram & Machining Technol, Minist Educ, Tianjin 300350, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2021年 / 799卷
基金：
中国国家自然科学基金;
关键词：
Aluminum matrix composites; MgAlB4; whisker; Spatial distribution; High strength-ductility synergy; ENHANCED TENSILE PROPERTIES; HIGH-PRESSURE TORSION; MECHANICAL-PROPERTIES; CERAMIC REINFORCEMENT; FRACTURE-BEHAVIOR; GROWTH-MECHANISM; TIB WHISKERS; MICROSTRUCTURE; TEMPERATURE; EXTRUSION;
D O I：
10.1016/j.msea.2020.140127
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
For ceramic reinforced metal matrix composites, it is a critical issue to improve the limited ductility to achieve a combination of high strength and high toughness. Herein, in-situ synthesized MgAlB4 whisker reinforced Al (MgAlB(4)w/Al) composites with rational distribution of the reinforcement were successfully prepared by an efficient process combining vacuum pressureless sintering and hot-extrusion. The results demonstrate that the MgAlB4 whiskers noticeably coarsen with increasing sintering temperature, while the sintering duration has little effect on the size of the whiskers. The as-extruded composite with 15 wt% MgAlB(4)w has excellent comprehensive properties with the ultimate tensile strength of 380 MPa and the fracture elongation of similar to 9.6%. Fracture analysis reveals that the whiskers bear most loads and fracture firstly to form crack sources with the load increasing during drawing. In addition, the alignment distribution of MgAlB(4)w along extrusion direction is the main reason for the improved ductility of the MgAlB(4)w/Al composite.
引用
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页数：12
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