纳米Al_2O_3颗粒增强镍基复合镀层的制备及微观力学性能  

Preparation and Micro Mechanical Properties of Nano-Al_2O_3 Particles Reinforced Ni Matrix Composite Coatings

作　　者：王红美[1] 徐滨士[1] 马世宁[1] 董世运[1] 

机构地区：[1]装甲兵工程学院装备再制造技术国防科技重点实验室,北京100072

出　　处：《材料热处理学报》2005年第1期81-85,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金重点项目 (50 2 350 30 ) ;国家 973项目(G1 9990 650 0 9) ;中英政府科技合作项目 (2 0 0 2M3)

摘　　要：采用高能机械化学法配置了纳米Al2 O3颗粒镍基复合镀液 ,并制备了纳米复合镀层。对所得复合镀层的组织和成分进行了分析 ,采用纳米压痕法研究了复合镀层的硬度、弹性模量等微观力学性能。结果表明 ,高能机械化学法有效解决了纳米颗粒的团聚 ,将镀液中 85 %的颗粒分散至纳米量级 ,使复合镀层中纳米颗粒的含量提高了 5 3% ,复合镀层组织更加致密、均匀 ;复合镀层的共沉积过程对纳米颗粒的粒径具有自动选择效应 ,镀层中纳米颗粒尺寸均小于 4 0nm ;纳米颗粒复合镀层具有良好的微观力学性能 ,硬度和弹性模量分别为 7 0 4GPa和 2 2 5GPa,这是由于纳米Al2 O3颗粒对复合镀层具有超细晶强化、硬质点弥散强化、高密度位错强化机制所致。Ni based composite solutions containing nano-Al2O3 particles were produced by high-energy mechanical and chemical processes. The structure and particle content of nano-Al2O3/Ni coating were determined, and the micro mechanical properties were analyzed by nano-indentation technique. The results show that 85 percent of particles in the solution are in the size of nano meter, nano-particle content in the coating increases by a factor of 53 percent and structure of the coating treated by high-energy mechanical and chemical processes is more compact compared to that of the coating untreated. The size of nano-particles is self-selected during the deposition of composite coating, and is in the range of less than 40 nm. Nano-Al2O3/Ni coating exhibits excellent mechanical properties, and the hardness and Young' s modulus are 7.04 GPa and 225 GPa, respectively, which are attributed to super-fine grain strengthening, dispersion strengthening, high-density dislocations strengthening of nano-Al2O3 particles to the composite coating.

关 键 词：纳米复合镀层 纳米压痕法 微观力学性能 强化机理 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TG113[金属学及工艺—金属学]