Swelling behavior in reactive sintering of Fe-Al mixtures

被引：49

作者：

Kang, HZ ^{[1
]}

Hu, CT ^{[1
]}

机构：

[1] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 300, Taiwan

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2004年 / 88卷 / 2-3期

关键词：

expansion; Fe-Al; reactive sintering; intermediate phase; exothermic heat;

D O I：

10.1016/j.matchemphys.2004.03.001

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Sintering is generally recognized as a consolidation process of the powder compacts. However, the swelling problem is always observed in a stress-free reactive sintering of iron-aluminum elemental powder mixtures. Present study on the stress-free vacuum sintering of Fe-29 at.% Al (for sintered Fe3Al) compacts indicated that the transitory appearance of an intermediate phase, Fe2Al5, attributed to this swelling behavior. Further study on the Fe-71.5 at.% Al (for sintered Fe2Al5) compacts shows that a large and rapid increase of the specimen's dimension occurred during a low temperature sintering process, meantime, a sponge-like porous microstructure was obtained. An in situ temperature variation was monitored on these Fe-Al compacts, and a violent and rapidly exothermic heat was found. Compared with the thermal behavior of Ni-Al compacts, it is suggested that many simultaneous fast reactions have occurred inside the Fe-Al mixture during sintering and cause the swelling phenomenon. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：264 / 272

页数：9

共 32 条

[1] CONTROLLED POROSITY BY AN EXTREME KIRKENDALL EFFECT [J].

ALDINGER, F .

ACTA METALLURGICA, 1974, 22 (07) :923-928

[2]

ALDINGER F, 1974, POWDER METALL INT, V6, P84

[3] DUCTILITY IMPROVEMENT IN IRON ALUMINIDES [J].

BAHADUR, A ;

KUMAR, BR ;

MOHANTY, ON .

JOURNAL OF MATERIALS SCIENCE, 1995, 30 (14) :3690-3696

[4]

DANNINGER H, 1988, POWDER METALL INT, V20, P21

[5] Processing, properties, and applications of nickel and iron aluminides [J].

Deevi, SC ;

Sikka, VK ;

Liu, CT .

PROGRESS IN MATERIALS SCIENCE, 1997, 42 (1-4) :177-192

[6] Powder processing of FeAl sheets by roll compaction [J].

Deevi, SC .

INTERMETALLICS, 2000, 8 (5-6) :679-685

[7]

Devan J.H., 1989, OXIDATION HIGH TEMPE, P107

[8] An investigation of mechanically alloyed Fe-Al [J].

Eelman, DA ;

Dahn, JR ;

MacKay, GR ;

Dunlap, RA .

JOURNAL OF ALLOYS AND COMPOUNDS, 1998, 266 (1-2) :234-240

[9] Processing of iron aluminides by pressureless sintering through Fe plus Al elemental route [J].

Gedevanishvili, S ;

Deevi, SC .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2002, 325 (1-2) :163-176

[10]

German R. M., 1992, THERMAL ANAL METALLU, P205

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