Developing Core-Shell Nano-Structures in FeCrAl-ODS Ferritic Alloys with the Co-Addition of Ni and Zr  

作　　者：Wenquan Ding Jieli Ma Yong Jiang Yiren Wang Huiqun Liu 

机构地区：[1]Key Laboratory for Nonferrous Materials of Ministry of Education,School of Materials Science and Engineering,Central South University,Changsha,410083,China [2]National Key Laboratory for Powder Metallurgy,Central South University,Changsha,410083,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第2期364-372,共9页金属学报（英文版）

基　　金：This work was financially supported by the National MCF Energy R&D Program of China(No.2018YFE0306100).The computational resources at Hefei Advanced Computing Center and the High Performance Computing Center of Central South University are also highly appreciated.

摘　　要：A new Ni+Zr co-alloyed FeCrAl-ODS(oxide-dispersion-strengthened)ferritic alloy was fabricated by ball-milling and hot-isostatic-pressing.Using electron microscopy and atom probe tomography,the dispersive formation of high density core-shelled nano-particles of various sizes was confirmed with a common B2-NiAl shell.Among which,median-sized nano-particles(20-50 nm)typically have an Y_(4)Al_(2)O_(9)nano-core of<~20 nm,ultra-fine nano-particles(<~20)nm have an Y_(4)Zr_(3)O_(12)nano-core of<~10 nm,and larger-sized nano-particles(50-100 nm)incorporate an ultra-fine Y_(4)Al_(2)O_(9)nano-core and a few ultra-fine Y_(4)Zr_(3)O_(12)nano-oxides.All these nano-phases were highly coherent with the ferritic matrix.No large Y--Al-O nano-oxides were formed.The total number density of ultra-fine nano-particles was estimated as~2×10^(23)m^(-3)with a mean size of 6.3 nm only,and accordingly,the new alloy achieved an excellent combination of strength and ductility at high temperatures.

关 键 词：FECRAL Oxide-dispersion-strengthened(ODS)alloy Mechanical alloying Nano-oxides CORE-SHELL 

分 类 号：TG146.21[一般工业技术—材料科学与工程]