本文選題：納米晶鐵　切入點(diǎn)：高能噴丸　出處：《稀有金屬材料與工程》2017年03期

【摘要】：利用高能噴丸法(HESP)在工業(yè)純鐵表面制備了一定厚度無(wú)污染、空位、雜質(zhì)等缺陷的納米晶層,其平均晶粒尺寸為50 nm,厚度為100μm。在Gleeble 1500熱模擬機(jī)上,采用脈沖加壓擴(kuò)散(PPD)和恒定加壓擴(kuò)散(CPD)對(duì)納米晶鐵在850℃下進(jìn)行滲鎳處理。結(jié)果表明,鎳原子在納米晶鐵中的擴(kuò)散系數(shù)比常規(guī)粗晶中高1個(gè)數(shù)量級(jí);而采用脈沖加壓擴(kuò)散時(shí),鎳原子的擴(kuò)散系數(shù)要比采用恒壓擴(kuò)散高1個(gè)數(shù)量級(jí)。鎳原子擴(kuò)散系數(shù)的提高主要包括三方面的原因,一是脈沖加壓能擊碎擴(kuò)撒界面上形成的阻礙鎳原子擴(kuò)散的金屬件化合物;二是納米晶鐵中形成的大量三叉晶界;三是納米晶鐵中形成大量的非平衡晶界。
[Abstract]:Nanocrystalline layers without contamination, vacancy, impurity and other defects were prepared on the surface of industrial pure iron by high energy shot peening method. The average grain size and thickness of nanocrystalline layer were 50 nm and 100 渭 m respectively. On the Gleeble 1500 thermal simulator, the average grain size was 50 nm and the thickness was 100 渭 m. Nanocrystalline iron was treated by pulse pressure diffusion (PPD) and constant pressure diffusion (CPD) at 850 鈩，

本文編號(hào)：1698948