Thermally induced ordering process of stoichiometric nanocrystalline Ni3Al intermetallic
Authors: Ismail, R.1; Yaacob, I.I.2
Source: Materials Research Innovations, Volume 13, Number 3, September 2009 , pp. 179-181(3)
Publisher: Maney Publishing
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Abstract:
Moderate to severe deformations were introduced by mechanical alloying of Ni and Al powders under argon gas atmosphere for different milling duration (4-24 h) to form stoichiometric nickel aluminide (Ni3Al) powder. The Ni3Al powders were consolidated into bulk compacts and sintered in a small differential thermal analysis furnace under flowing argon at 660°C for 4 h holding time. Characterisation by transmission electron microscopy revealed that the microstructure was retained at nanoscale dimension with presence of shear bands. Lattice parameter decreased significantly as milling time was increased to 18 h. Long range order parameter in ordering process showed partial ordering in the single phase nickel aluminide after sintering due to relaxation of internal stress.Keywords: INTERMETALLICS; MECHANICAL ALLOYING; REACTIVE SINTERING; ORDERING TRANSFORMATION
Document Type: Research article
DOI: 10.1179/143307509X437554
Affiliations: 1: Center of Nanotechnology, Precision and Advanced Materials, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia 2: Center of Nanotechnology, Precision and Advanced Materials, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia;, Email: iskandar@um.edu.my
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