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Titolo:
Formation of nanocrystalline Fe-Co powders produced by mechanical alloying
Autore:
Kim, YD; Chung, JY; Kim, J; Jeon, H;
Indirizzi:
Hanyang Univ, Div Engn & Mat Sci, Seoul 133791, South Korea Hanyang Univ Seoul South Korea 133791 Mat Sci, Seoul 133791, South Korea Hanyang Univ, Dept Met & Mat Sci, Ansan 425791, South Korea Hanyang Univ Ansan South Korea 425791 Mat Sci, Ansan 425791, South Korea
Titolo Testata:
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
fascicolo: 1-2, volume: 291, anno: 2000,
pagine: 17 - 21
SICI:
0921-5093(20001031)291:1-2<17:FONFPP>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATTRITION;
Keywords:
mechanical alloying; nanostructured materials; coercivity; spark plasma sintering;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Kim, YD Hanyang Univ, Div Engn & Mat Sci, Seoul 133791, South Korea Hanyang Univ Seoul South Korea 133791 Seoul 133791, South Korea
Citazione:
Y.D. Kim et al., "Formation of nanocrystalline Fe-Co powders produced by mechanical alloying", MAT SCI E A, 291(1-2), 2000, pp. 17-21

Abstract

The structural and magnetic properties of Fe-Co alloy powders produced by mechanical alloying of elemental powders were investigated. In this research, two kinds of milling methods (cyclic and conventional operation) were adopted to optimize the milling process. Consequently, the alloy powder with average grain size 10-15 nm was obtained. The cyclic operation had an advantage over conventional milling in that a smaller-grained structure could beobtained with less milling time. Maximum M-s was obtained at the composition of 30 at.% Co. Due to the high amount of internal strain introduced during milling, relatively high coercivities were obtained. The coercivity was decreased fairly through the relief of the internal strain by heat treatment. Over 95% of the theoretical density was attained after the spark plasma sintering at 900 degrees C for 5 min with applying pressure of 60 MPa. The sintered specimen remains nanostructured with a grain size of about 30 nm. (C) 2000 Elsevier Science S.A. All rights reserved.

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Documento generato il 23/01/20 alle ore 06:21:36