Title

Thermal stability, microstructure and mechanical properties of nanostructured Al-Ni-Mm-X (X = Cu and Fe) alloys hot-extruded from gas-atomized powders

Authors

Authors

H. S. Kim; Y. H. Sohn; T. G. Kim; J. M. Koo;S. J. Hong

Comments

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Abbreviated Journal Title

Mater. Trans.

Keywords

rapid solidification; nano-crystalline materials; Al-Ni-Mm; high; strength; thermal stability; AMORPHOUS-ALLOYS; PARTICLES; BEHAVIOR; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering

Abstract

The effects of Cu and Fe additions on the thermal stability, microstructure and mechanical properties of Al-85-Ni-8.5-Mm(6.5), Al-94-Ni(8.5)Mm(6.5)Cu(1), Al-84-Ni-8.5-Mn16.5Fe1 alloys, manufactured by gas atomization, degassing and hot-extrusion were investigated. All hot-extruded alloys consisted of homogeneously-distributed fine-grained fcc-Al matrix and intermetallic compounds. A substitution of 1 at% Al by Cu increased the thermal stability of the amorphous phase and produced alloy microstructure with smaller fcc-Al grains. On ther other hand, the same substitution of 1 at% Al by Fe decreased the stability of the amorphous phase and produced larger fcc-Al grains. The formation of intermetallic compounds such as Al3Ni, Al11Ce3 and Al11La3 was suppressed by the addition of Cu or Fe. Among the three alloys examined, the highest Vickers hardness and compressive strength were obtained for Al-84-Ni-8.5-Mm(6.5)Cu(1) alloy, and related to the finest fcc-Al grain size attained from increased thermal stability with Cu addition.

Journal Title

Materials Transactions

Volume

49

Issue/Number

6

Publication Date

1-1-2008

Document Type

Article

Language

English

First Page

1223

Last Page

1228

WOS Identifier

WOS:000258160900004

ISSN

1345-9678

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