Microstructures and wear properties of graphite and Al2O3 reinforced AZ91D-Cex composites

被引：0
作者：
Zhang Mei-juan [1 ,2 ]
Cao Zhan-yi [1 ]
Yang Xiao-hong [1 ]
Liu Yong-bing [1 ]
机构：
[1] Jilin Univ, Minist Educ, Key Lab Automobile Mat, Changchun 130025, Peoples R China
[2] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2010年 / 20卷
关键词：
magnesium matrix composite; graphite; Ce; wear property; SLIDING WEAR; MECHANICAL-PROPERTIES; MATRIX COMPOSITES; RARE-EARTHS; AL-ALLOY; MG; BEHAVIOR; TEMPERATURE; FABRICATION; MAGNESIUM;
D O I：
暂无
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The magnesium matrix composites reinforced by graphite particles and Al2O3 short fibers were fabricated by squeeze-infiltration technique. The additions dispersed uniformly and no agglomeration and casting defect were observed. The microstructures and wear properties of the composites with different Ce contents of 0, 0.4%, 0.8% and 1.0%, respectively, were investigated. Especially, the effect of Ce on the properties was discussed. The results reveal that Ce enriches around the boundaries of graphite particles and forms Al3Ce phase with Al. The addition of Ce refines the microstructures of the composites. With the increase of Ce content, the grain size becomes smaller and the wear resistance of the composite is improved. At low load, the composites have similar worn surface. At high load, the composite with 1.0% Ce has the best wear resistance due to the existence of Al3Ce phase. The Al3Ce phase improves the thermal stability of the matrix so the graphite particles can keep intact, which can still work as lubricant. At low load, the wear mechanism is abrasive wear and oxidation wear. At high load, the wear mechanism changes to delamination wear for all the composites.
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收藏
页码：S471 / S475
页数：5
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