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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 surface layer of nanocrystal was formed on the surface of nickel by mechanical surface treatment (SMAT). The microstructure and composition analysis showed that Fe, Cr and other elements on stainless steel ball could diffuse and infiltrate the surface of Ni sample during the grinding process. Fe, Cr, etc. Elements in the heating process can be further diffusion and homogenization, and Ni elements can be combined into a new alloy. The formation of a new alloy causes the magnetic properties of the Ni surface to change. The results show that the Curie temperature of nanocrystalline Ni surface prepared by SMAT can reach above 600 ℃, which is much higher than 354.3 ℃ of pure crystalline Ni, which shows that SMAT is not only a surface nanocrystallization but also an effective Surface modification process.