Title

Structure And Properties Of Rapidly Solidified And Mechanically Milled Nanostructured Al-Ni-Mm Alloys

Keywords

Al-Ni-Mm; Extrusion; Mechanical alloying; Nanostructure; Rapid solidification

Abstract

The structure and mechanical properties of rapidly solidified Al-Ni-Mm (Mm: misch metal) alloys in the as-solidified or mechanically milled, and extruded conditions were investigated. The hardness of the Al86Ni 9Mm5 alloy varied with the solute content in the amorphous phase and the micro structure after heat treatment. The hardening in these nanocomposites was quantitatively explained using a rule-of-mixtures model based on the volume fraction of the phases. The effect of powder size on the microstructure and mechanical properties was studied in gasatomized powders and their extrudates. With decreasing powder size, formation of intermetallic compounds such as Al3Ni, Al11La3 and Al 11Ce3 was suppressed, and powders < 26 urn in size consisted of nanocrystalline fcc-Al embedded in an amorphous matrix. Microstructural scale of the extruded bar decreased with decreasing initial powder size. The UTS of the alloy increased from about 512 to 728 MPa with decreasing initial powder size from 75-90 urn to < 26 μm. To refine the microstructure and enhance the mechanical properties further, the coarse Al-Ni-Mm alloy powders were mechanically milled. Details of the microstructural development as a function of milling time and its effect on the microhardness of the alloy are discussed.

Publication Date

12-1-2005

Publication Title

Journal of Metastable and Nanocrystalline Materials

Volume

24-25

Number of Pages

703-708

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.4028/www.scientific.net/JMNM.24-25.703

Socpus ID

63849254119 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/63849254119

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