FeCr-ODS铁素体合金的氧化+粉锻工艺制备及其微观结构  

Preparation and Microstructure of FeCr-ODS Ferrite Alloy Fabricated by Oxidation and Powder Forging

作　　者：闫福照 李静[1] 熊良银[1] 刘实[1] YAN Fuzhao;LI Jing;XIONG Liangyin;LIU Shi(Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所师昌绪先进材料中心,沈阳110016 [2]中国科学技术大学材料科学与工程学院,沈阳110016

出　　处：《材料研究学报》2022年第6期461-470,共10页Chinese Journal of Materials Research

基　　金：国防科技工业核材料技术创新中心项目(ICNM-2020-ZH-17)。

摘　　要：提出一种氧化+粉锻(粉末锻造)新工艺并用其制备了FeCr-ODS铁素体合金。使用SEM、XPS、EPMA和TEM等手段对其表征,研究了粉末表面和内部氧化物的生成、演变以及合金中纳米氧化物弥散相的种类和分布特征。结果表明,在低温氧化过程中粉末表面生成了一层Fe的氧化膜,在随后的加热过程中粉末表面的O元素转移并与Y和Ti元素反应生成了Y-Ti-O纳米氧化物弥散相。通过纳米氧化物弥散相在粉末成型过程中的演变,阐明了粉锻对位错和纳米氧化物析出相形成的贡献。用这种工艺制备的ODS铁素体合金,大量细小的Y_(2)TiO_(5)析出相均匀地分布在基体中,晶界上只有少量大颗粒Y_(2)O_(3)。FeCr-ODS ferrite alloy was fabricated via a novel fabrication process of pre-oxidation treatment followed by powder forging proposed by the authors.The prepared alloy was characterized by means of SEM,XPS,EPMA and TEM techniques in terms of the generation,evolution of oxides on the surface and interior of the powder,as well as the type and distribution of oxide nanoparticles in the fabricated ODS ferrite alloy.The results show that an iron oxide film formed on the surface of powders during low temperature oxidation.By the subsequent heating process,the iron oxide could react with Y and Ti to form complex oxide Y-Ti-O nanoparticles.The evolution of oxide dispersoids during the course of fabrication was characterized to clarify the contribution of powder forging to dislocations and nanoscale precipitates.Fine Y_(2)TiO_(5)nanoparticles uniformly distributed in the matrix,and a small number of Y_(2)O_(3)particles aligned along the grain boundaries by this manufacturing method.

关 键 词：材料合成与加工工艺 FeCr-ODS铁素体合金 粉锻 Y-Ti-O纳米颗粒 形成机理 微观组织 

分 类 号：TB331[一般工业技术—材料科学与工程]