首页|超细晶Al5083合金和碳化硼增强Al5083基复合材料的室温和高温干滑动摩擦磨损行为

超细晶Al5083合金和碳化硼增强Al5083基复合材料的室温和高温干滑动摩擦磨损行为

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讨论机械球磨Al5083合金和Al5083−5wt.％B4C复合材料在室温和200°C下的摩擦行为和磨损机制.结果表明,由于常温下的氧化磨损,形成可保护试样表面的机械混合层.在室温和80 N载荷下,Al5083和Al5083−5wt.％B4C球磨样品有磨损迹象,但体积磨损量有限,磨损率分别为5.8×10−7和4.4×10−7mm3/(m·N).在200°C和80 N载荷下,球磨Al5083样品磨损严重,磨损率达10.8×10−7 mm3/(m·N);Al5083−5wt.％B4C样品的磨损较轻,局部出现三体磨损,磨损率为5.3×10−7 mm3/(m·N).位错钉扎和Hall−Petch理论等强化机制、高硬度和载荷传递效应是决定Al5083−5wt.％B4C复合材料磨损行为的关键因素.另一方面,球磨Al5083样品在200°C下磨损率较高可能与其局部晶粒长大和硬度下降有关.
Wear behavior and dry sliding tribological properties of ultra-fine grained Al5083 alloy and boron carbide-reinforced Al5083-based composite at room and elevated temperatures
Tribological behavior and wear mechanisms of mechanically milled Al5083 alloy and Al5083−5wt.％B4C composite at room temperature and 200 °C were discussed. Results revealed that due to the oxidative wear at room temperature, a mechanically mixed layer (MML) was formed to protect the surface of the samples. Under 80 N of load at room temperature, the milled Al5083 and the Al5083−5wt.％B4C samples showed evidence of abrasion with limited volume loss. In this case, the wear rates were 5.8×10−7 and 4.4×10−7 mm3/(m·N), respectively. At 200 °C and under 80 N of applied load, severe wear occurred in the milled Al5083 sample, and wear rate reached 10.8×10−7 mm3/(m·N) while the Al5083−5wt.％B4C sample showed mild wear with local 3-body abrasion and the wear rate reached 5.3×10−7 mm3/(m·N). Strengthening mechanisms such as dislocation pinning and the Hall−Petch theory, high hardness and the load transfer effect were crucial in determining the wear behavior of the Al5083−5wt.％B4C composite. On the other hand, the milled Al5083 sample represented a relatively high wear rate at 200 °C, which seemed to be related to the local grain growth and a drop in its hardness.

tribological behavioroxidative wearmechanically mixed layerwear rateHall−Petch theory

Matin SAESSI、Ali ALIZADEH、Alireza ABDOLLAHI

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Department of Composites,Malek-Ashtar University of Technology,Tehran,Iran

Department of Materials and Manufacturing Processes,Malek-Ashtar University of Technology,Tehran,Iran

Metallic Materials Research Center,Malek-Ashtar University of Technology,Tehran,Iran

摩擦行为 氧化磨损 机械混合层 磨损率 Hall−Petch理论

Authors would like to appreciate the former chief of Faculty of Materials & Manufacturing Processes of the Malek-Ashtar Universi

2021

10.1016/S1003-6326(20)65479-6

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(1)
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