Synthesis of nanocrystalline NiAl over a wide composition range by mechanical alloying

Murty, B. S. ; Singh, K. H. S. ; Pabi, S. K. (1996) Synthesis of nanocrystalline NiAl over a wide composition range by mechanical alloying Bulletin of Materials Science, 19 (3). pp. 565-571. ISSN 0250-4707

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Official URL: http://www.ias.ac.in/j_archive/bms/19/3/565-571/vi...

Related URL: http://dx.doi.org/10.1007/BF02744829

Abstract

The influence of oxides on the stabilisation of zinc foam made by foaming-compacted powder mixtures has been investigated by varying the oxide content in the zinc powder used by oxidation and reduction. Optical, scanning electron and transmission electron microscopy as well as energy dispersive X-ray mapping were used to determine the oxide distribution, morphology and structure in the foams. The study revealed that with increase in the oxide content of the foam, the maximum expansion and expansion rate increased. Small amount of nano-sized oxide particles and their cluster, which are randomly distributed, were observed within the bulk of foam. But the major fraction of oxides is observed on the surface of pores in the form of clusters. These clusters are distributed uniformly all over the surface. Effect of these oxides on the stability of foam is discussed. The formation of satellite pores, which is characteristic signature of zinc foams, and their stability, is investigated.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Nanocrystals; Nickel Aluminides; Mechanical Alloying
ID Code:73361
Deposited On:02 Dec 2011 08:00
Last Modified:18 May 2016 18:13

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