Mechanical Properties and Fracture Behavior of Mg-Al/AlN Composites with Different Particle Contents

被引：29
作者：
Chen, Jie [1 ]
Bao, Chonggao [1 ]
Chen, Wenhui [1 ]
Zhang, Li [1 ]
Liu, Jinling [2 ]
机构：
[1] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China
[2] Southwest Jiaotong Univ, Sch Mech & Engn, State Key Lab Tract Power, Chengdu 610031, Sichuan, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2017年 / 33卷 / 07期
关键词：
Magnesium matrix composite; AlN particle; Bending strength; Fracture behavior; Microstructure; Powder metallurgy; MAGNESIUM MATRIX COMPOSITES; TENSILE PROPERTIES; HOT-DEFORMATION; ALLOY; ALN; MICROSTRUCTURE; NANOCOMPOSITES; STRENGTH; POWDERS; MMNCS;
D O I：
10.1016/j.jmst.2016.07.010
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, magnesium matrix composites reinforced with different loading of AlN particles were fabricated by the powder metallurgy technique. The microstructure, bending strength and fracture behavior of the resulting Mg-Al/AlN composites were investigated. It showed that the 5 wt% AlN reinforcements led to the highest densification and bending strength. The total strengthening effect of AlN particles was predicted by considering the contributions of CTE mismatch between the matrix and the particles, load bearing and Hall-Petch mechanism. The results revealed that the increase of dislocation density, the change of Mg17Al12 phase morphology, and the effective load transfer were the major strengthening contributors to the composites. The fracture of the composites altered from plastic to brittle mode with increasing reinforcement content. The regions of clustered particles in the composites were easy to be damaged under external load, and the fracture occurred mainly along grain boundaries. (C) 2016 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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页码：668 / 674
页数：7
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