Title

Thermal Stability, Microstructure And Mechanical Properties Of Nanostructured Al-Ni-Mm-X (X = Cu And Fe) Alloys Hot-Extruded From Gas-Atomized Powders

Keywords

Al-Ni-Mm; High strength; Nano-crystalline materials; Rapid solidification; Thermal stability

Abstract

The effects of Cu and Fe additions on the thermal stability, microstructure and mechanical properties of Al85-Ni8.5-Mm6.5, Al84-Ni8.5 Mm6.5Cu1, Al 84-Ni8.5-Mm6.5Fe1 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 Al11 La 3 was suppressed by the addition of Cu or Fe. Among the three alloys examined, the highest Vickers hardness and compressive strength were obtained for Al84-Ni8.5-Mm6.5Cu1 alloy, and related to the finest fcc-Al grain size attained from increased thermal stability with Cu addition. © 2008 The Japan Institute of Metals.

Publication Date

6-1-2008

Publication Title

Materials Transactions

Volume

49

Issue

6

Number of Pages

1223-1228

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.2320/matertrans.MRA2007631

Socpus ID

48249116427 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/48249116427

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