摘要
采用表面机械研磨处理技术,选用陶瓷球和钢球作为弹射介质,在2024铝合金表面分别制备出纯净的纳米晶层和含铁纳米晶层。表面机械研磨处理前后2024铝合金摩擦磨损性能在载荷为1.5 N的条件下与直径为5 mm的GCr15钢球对磨进行了研究。结果表明,表面机械研磨处理30 min后,陶瓷球处理铝合金表面纳米晶层平均晶粒尺寸达到49.2 nm,钢球处理铝合金表面纳米晶层平均晶粒尺寸细化到52.1 nm。此外,采用钢球作为弹射介质进行表面机械研磨处理在纳米晶表层引入了厚度约为5μm的含铁层。在晶粒细化、硬度增加和含铁层的润滑作用共同作用下,2024铝合金的耐磨性能得到显著改善。
The pure and Fe-containing nanocrystalline layers were fabricated on the surface of 2024 Al alloy by surface mechanical attrition treatment（SMAT） using ceramic balls and steel balls,respectively.The friction and wear properties of 2024 Al alloy before and after SMAT were investigated by sliding against a GCr15 steel ball of 5 mm in diameter at a load of 1.5 N.The results demonstrate that the surface nanocrystalline layers with average grain sizes of 49.2 and 52.1 nm can be obtained by using ceramic balls and steel balls,respectively,when treated for 30 min.Moreover,a 5 μm thick surface layer containing Fe is also introduced into the Al nanocrystalline surface when treated using steel balls.The wear resistance of 2024 Al alloy is improved due to the combination of grain refinement,increased hardness and lubrication effect of iron-containing layer.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2015年第6期1320-1325,共6页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(51201008,51171020)
the Fundamental Research Funds for the Central Universities(FRF-TP-12-166A)
Doctoral Fund of Ministry of Education of China(20120006120043)
关键词
铝合金
表面纳米化
表面机械研磨处理
摩擦
磨损
aluminum alloy
surface nanocrystallization
surface mechanical attrition treatment
friction
wear
