Title

Synthesis Of Nanocomposites And Amorphous Alloys By Mechanical Alloying

Abstract

Mechanical alloying (MA) is a powder metallurgy processing technique that involves repeated cold welding, fracturing, and rewelding of powder particles in a high-energy ball mill. Due to the specific advantages offered by this technique, MA was used to synthesize a variety of advanced materials. This article presents two specific examples of synthesis of nanocomposites containing a high volume fraction of the reinforcement phase in Al and TiAl matrices. It was possible to uniformly disperse 50 vol% of nanometric (50 nm) Al 2O3 in Al and achieve high strength and modulus of elasticity. Similarly, it was possible to disperse 60 vol% of Ti 5Si3 phase in the γ-TiAl intermetallic. Fully consolidated material showed superplastic behavior at 950°C and a strain rate of 4 × 10-5 s-1. Amorphous phases were produced by MA of blended elemental powder mixtures in several Fe-based compositions. From the systematic investigations carried out, it was possible to deduce the criteria for glass formation and understand the interesting phenomenon of mechanical crystallization. By conducting some controlled experiments, it was also possible to explain the mechanism of amorphization in these mechanically alloyed powder blends. Other examples of synthesis of advanced materials, e.g., photovoltaic materials and energetic materials, have also been briefly referred to. This article concludes with an indication of the topics that need special attention for further exploitation of these materials. © Springer Science+Business Media, LLC 2011.

Publication Date

10-1-2011

Publication Title

Journal of Materials Science

Volume

46

Issue

19

Number of Pages

6301-6315

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1007/s10853-011-5287-0

Socpus ID

80051548158 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/80051548158

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