Significant improvement of wear properties by creating micro/nano dual-scale structure in Al-Sn alloys

被引：24
作者：
Lu, Z. C. [1 ]
Zeng, M. Q. [1 ]
Gao, Y. [1 ]
Zhu, M. [1 ]
机构：
[1] S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China
来源：
WEAR | 2012年 / 296卷 / 1-2期
关键词：
Sliding wear; Non-ferrous metals; Bearings; Wear testing; GRAIN-SIZE; TRIBOLOGICAL BEHAVIOR; MECHANICAL-PROPERTIES; IMMISCIBLE ALLOYS; CRACK-GROWTH; PB ALLOYS; NANOCRYSTALLINE; DEFORMATION; FRICTION; MICROSTRUCTURE;
D O I：
10.1016/j.wear.2012.08.002
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
We present in this work evidence that significant improvement of wear behavior can be achieved by creating a dual-scale structure. An Al-12 wt%Sn bearing alloy consisting of mixtures of nanocrystalline (NC) Al-Sn powder and coarse-grained (CG) Al-Sn powder was produced by a combination of mechanical alloying and conventional powder sintering. The extent of the improvement in wear properties was related to the ratio of NC/UFG to CG, and the best properties were achieved at a ratio of 30 wt% CG. With this ratio, this dual-scale Al-Sn (CG-30) alloy had a wear resistance about 1.5 times greater than that of the monolithic NC/UFC alloy prepared by mechanical alloying, about twice that of the monolithic CG alloy. The friction coefficient decreased by nearly 13% of the CG alloy. The detailed wear mechanism investigation revealed that an optimized combination of hardness and toughness is a key for the improvement of wear properties in the dual-scale material. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：469 / 478
页数：10
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