微晶和纳晶Co–Ni–Fe合金摩擦磨损特性的比较  

Comparison of Friction and Wear Characteristics of Microcrystalline and Nanocrystalline Co–Ni–Fe Alloy

作　　者：林兰芳[1] 林绿波[2] 戴品强[2,3] 

机构地区：[1]集美大学轮机工程学院,福建厦门361021 [2]福州大学材料科学与工程学院,福州350108 [3]福建工程学院材料科学与工程系,福州350108

出　　处：《中国表面工程》2011年第2期83-87,共5页China Surface Engineering

基　　金：福建省自然科学基金(E0810006)

摘　　要：用脉冲电沉积技术制备了表面平整光亮的纳晶Co–Ni–Fe合金镀层。将纳晶镀层退火获得微晶Co–Ni–Fe合金镀层。采用XRD、TEM、EDS等方法研究了微晶和纳晶镀层的微观组织结构和合金成分。在干滑动条件下测定了微晶和纳晶镀层的摩擦磨损性能,并研究了磨痕的组织结构和硬度变化。结果表明:微晶和纳晶镀层均为单相面心立方结构。微晶和纳晶镀层磨损过程的塑性变形机制存在明显差异。摩擦磨损使纳晶发生晶粒长大,而对其硬度影响不大;摩擦磨损使微晶镀层表面发生纳米化,且存在明显的加工硬化现象。纳晶镀层的耐磨性能优于微晶镀层,但两者的主要磨损机制均为粘着磨损。Nanocrystalline Co–Ni–Fe alloy was synthesized by pulsed electrodeposition.The structure,surface morphology and composition of microcrystalline（mc） and nanocrystalline（nc） coatings were studied by XRD,TEM,SEM and EDS.The dry sliding friction and wear characteristics were investigated by using friction and wear tester.The results indicated that the wear resistance of nc fcc Co–Ni–Fe alloy coating is better than its mc counterpart.Sliding wear developed two entirely diffierent substructures in mc and nc coatings.Under the extensive plastic deformation,surface nanocrystallization occurred in the former and deformation–induced grain growth in the latter.Microhardness in the mc alloy coating was increased due to work hardening and surface nanocrystallization.On the contrary,microhardness remained at slightly lower levels for nc alloy coating probably due to grain coarsening.The main wear mechanism of both mc and nc alloy coating is adhesive wear.

关 键 词：脉冲电沉积 纳米晶 Co–Ni–Fe 耐磨性 磨损机制 

分 类 号：TG115.58[金属学及工艺—物理冶金]