Synthesis of nanocrystalline/quasicrystalline Mg32(Al,Zn)49 by melt spinning and mechanical milling

Mukhopadhyay, N K and Bhatt, Jatin and Pramanick, A K and Murty, B S and Paufler, P (2004) Synthesis of nanocrystalline/quasicrystalline Mg32(Al,Zn)49 by melt spinning and mechanical milling. Journal of Materials Science, 39 (16-17). pp. 5155-5159.

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In the present investigation we have made an attempt to synthesize T-Mg32(Al,Zn)49 Frank Kasper phase and investigate the mechanical properties of the T-Phase in micro and nano scale. Single T-Phase (bcc, a = 1.42 nm) has been prepared by conventional casting with a proper combination of flux in order to avoid the loss of magnesium from the melt. Chemical analysis by energy dispersive X-ray microanalysis system attached to scanning electron microscope has confirmed the desired composition for T-phase. The as-cast material was then rapidly solidified by melt spinning and mechanically milled using a high-energy ball mill. The samples were characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction techniques. The rapidly solidified foils showed the presence of mostly nanoquasicrystalline phases coexisting with a minute amount of crystalline phases in the thin region where the cooling rate is expected to be high. The dark field imaging in electron microscopy clearly confirms the existence of nano phases. Mechanically milled powder exhibited the evolution of nanophases at higher milling time. Microhardness measurement at low load was carried out in both the as-cast and nanophase materials in order to understand the influence of nanophases on the mode of deformation and cracking at low load.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Nanocrystalline; quasicrystalline
Divisions:Material Science and Technology
ID Code:797
Deposited By:Sahu A K
Deposited On:01 Jun 2010 11:12
Last Modified:25 Jan 2012 11:27
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