Formation Mechanism of Nanoparticles in Fe-Cr-Al ODS Alloy Fabricated by Direct Oxidation Method  

作　　者：Fuzhao Yan Jing Li Yiyi Li Liangyin Xiong Shi Liu 

机构地区：[1]Materials for Special Environments Division,CAS Key Laboratory of Nuclear Materials and Safety Assessment,Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2021年第7期963-972,共10页金属学报（英文版）

基　　金：supported by the National Defense Science and Technology Industry Nuclear Material Technology Innovation Center Project(No.ICNM-2020-ZH-17)。

摘　　要：This study presents the fabrication of 14CrFe-Cr-Al oxide dispersion strengthened(ODS)alloy by a direct oxidation process.In order to explain how oxide nanoparticles are formed in the consolidation process,the powders after oxidation are subjected to vacuum thermal treatment at high temperatures.Differential scanning calorimeter,X-ray photoelectron spectroscopy,scanning electron microscopy and transmission electron microscopy techniques are used to detect the generation,evolution of oxides on both the surface and interior of the powder,as well as the type of oxide nanoparticles in the fabricated ODS alloy.It is found that an iron oxide layer is formed on the surface of the powder during low temperature oxidation.And the iron oxide layer would be decomposed after thermal treatment at high temperature.In the consolidation process,the oxygen required by the reaction of alumina and yttrium oxide to produce nano scale Y-Al-O particles mainly derives from the decomposition of iron oxide layer at elevated temperature and the inward diffusion of oxygen.Using the direct oxidation process,YAlO_(3) nanoparticles are dispersed in the grains and at the grain boundaries of Fe-Cr-Al ODS alloy.

关 键 词：Fe-Cr-Al ODS alloy Direct oxidation Iron oxide layer Y-Al-O nanoparticles Formation mechanism 

分 类 号：TF125.5[冶金工程—粉末冶金]