摘要
通过表面机械研磨处理(SMAT)在镍样品表面形成一层纳米晶表层,组织和成分分析表明不锈钢球上的Fe、Cr等元素在研磨处理过程中能扩散和渗入Ni样品表层,Fe、Cr等元素在升温过程中能进一步扩散和均匀化,并能与Ni元素结合成新合金。新合金的形成导致Ni表层磁性能发生变化。研究表明:经SMAT制备的纳米晶Ni表层的居里温度可达600℃以上,远高于粗晶纯Ni的354.3℃,显示了SMAT不仅是一种表面纳米化工艺,而且是一种有效的表面改性工艺。
A nanocrystalline surface layer was formed on Ni plate by surface mechanical attrition treatment（SMAT）.The characterization of microstructure and composition indicates that Fe and Cr elements from stainless steel balls can diffuse and permeate into the Ni surface layer during SMAT.Fe and Cr can further diffuse and homogenize when annealing at high temperature,leading to the formation of new alloy with Ni,which results in the different magnetic property of Ni plate.The results show that the value of curie temperature（Tc） for nanocrystalline Ni surface layer induced by SMAT can exceed 600 ℃,much higher than that for the coarse-grained pure Ni（354.3 ℃）,which indicates that SMAT is not only a process for surface nanocrystallization,but also an effective method for surface modification.
出处
《金属热处理》
CAS
CSCD
北大核心
2011年第3期9-13,共5页
Heat Treatment of Metals
基金
国家自然科学基金项目(50871069)
上海市教委"晨光计划"项目(09CG51)
上海市教委重点学科项目(J50503)
上海高校选拔培养优秀青年教师科研专项基金项目(slg09015)
关键词
表面机械研磨处理
纳米晶材料
扩散
镍
磁性能
显微组织
surface mechanical attrition treatment
nanocrystalline materials
diffusion
nickel
magnetic property
microstructure
