Grain growth of nanocrystalline Fe-Al alloys produced by cryomilling in liquid argon and nitrogen

被引：69
|
作者：
Huang, B [1 ]
Perez, RJ [1 ]
Lavernia, EJ [1 ]
机构：
[1] Univ Calif Irvine, Dept Chem & Biochem Engn & Mat Sci, Irvine, CA 92697 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1998年 / 255卷 / 1-2期
关键词：
Fe-Al alloys; cryomilling; thermal stability;
D O I：
10.1016/S0921-5093(98)00765-5
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Cryomilling of Fe-10 wt.%Al powders in liquid argon as well as in liquid nitrogen resulted in nanocrystalline structures which were thermally stable at least up to 1223 K, or 67% of the melting temperature of Fe. In contrast, cryomilling of elemental Fe resulted in a nanocrystalline structure which grew to a sub-micron scale following annealing at 1223 K. The enhanced thermal stability of the cryomilled Fe-10 wt.%Al powders in liquid argon was attributed to the formation of gamma-Al2O3 due to the moisture condensation. The thermal stability of the Fe-10 wt.%Al powders milled in liquid nitrogen was attributed to the formation of oxynitrides, or gamma-Al2O3 and AlN particles during cryomilling in liquid nitrogen. The formation of Fe3O4 particles did not result in enhanced thermal stability. The presence of Al is essential in achieving thermal stability of nanocrystalline structures in cryomilled Fe powders. (C) 1998 Elsevier Science S.A. All rights reserved.
引用
收藏
页码：124 / 132
页数：9
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