锆和钛含量对铝添加高铬ODS钢氧化物粒子的影响  

Effects of Zr and Ti Contents on Oxide Nanoparticles in Al-Alloyed High-Cr ODS Steels

作　　者：窦鹏 张鑫 木村晃彦 贺跃辉[3] 刘锦川[4] 

机构地区：[1]重庆大学材料科学与工程学院,重庆 [2]京都大学先进能源研究所,京都 [3]中南大学粉末冶金国家重点实验室,湖南长沙 [4]香港城市大学科学与工程学院机械与生物医学系先进结构材料中心,香港

出　　处：《材料科学》2017年第3期413-422,共10页Material Sciences

基　　金：国家自然科学基金面上项目:微量元素对铝添加高铬ODS钢纳米氧化物形成机制的影响;批准号:51571042。

摘　　要：为了研究活性元素Zr和Ti的含量对铝添加高铬氧化物弥散强化钢(oxide dispersion strengthened steel, ODS钢)中纳米粒子的影响,本文利用透射电子显微学(包括衍射衬度技术)和高分辨透射电子显微学对采用机械合金化工艺制备的ODS-Zr-1 (Fe-15Cr-4Al-2W-0.15Ti-0.3Zr-0.35Y2O3)合金中氧化物进行了表征。与无锆添加含铝高铬ODS钢——SOC-9 (Fe-15.5Cr-4Al-2W-0.1Ti-0.35Y2O3)相比,添加0.3 wt.%的Zr使ODS-Zr-1合金中氧化物纳米粒子的弥散形貌与共格性显著改善。ODS-Zr-1合金中尺寸小于10 nm的粒子的数量比例为~98%,其中绝大多数粒子为与体心立方铁素体基体相共格的并具有三角晶体结构的δ相Y4Zr3O12复合氧化物。在ODS-Zr-1合金中也发现少量的Y2TiO5和YTiO3复合氧化物粒子的存在。本文将所得结果与SOC-9和SOC-14 (Fe-15Cr-4Al-2W-0.1Ti-0.63Zr-0.35Y2O3)合金中氧化物纳米粒子的表征结果对比,并据此简要分析讨论了锆和钛含量对铝添加高铬ODS钢纳米氧化物的高温稳定性与耐辐照稳定性的影响机理。In order to study the effects of zirconium and titanium contents on the nanoparticles in Al-added high-Cr ODS steels and the oxides of ODS-Zr-1 (Fe-15Cr-4Al-2W-0.15Ti-0.3Zr-0.35Y2O3) which was synthesized by mechanical alloying, have been examined by transmission electron microscopy (TEM), including diffraction contrast techniques, and high resolution transmission electron mi-croscopy (HRTEM). Relative to SOC-9 (Fe-15.5Cr-2W-0.1Ti-4Al-0.35Y2O3), i.e., an Al-alloyed high-Cr ODS steel without Zr addition, not only the dispersion morphology but also the coherency of the nanoparticles in ODS-Zr-1 was significantly improved. About 98% of the oxides are smaller than 10 nm. Most of the nanoparticles were found to be consistent with trigonal δ-phase Y4Zr3O12 oxides and coherent with the bcc steel matrix. Y2TiO5 and YTiO3 oxides were also detected in ODS-Zr-1. The results of ODS-Zr-1 were compared with those of SOC-9 and SOC-14 (Fe-15Cr-2W- 0.1Ti-4Al-0.63Zr-0.35Y2O3) with a brief discussion of the mechanisms of the effects of the addition of zirconium and titanium on the unusual thermal and irradiation stabilities of the oxides in ODS steels.

关 键 词：氧化物弥散强化钢 透射电子显微学 高分辨透射电子显微学 共格性 错配莫尔条纹 

分 类 号：TG14[一般工业技术—材料科学与工程]