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Synthesis of Intermetallic Ni3Al Alloy: Properties and High Temperature Oxidation Behaviour

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Abstract:

Two different methods were utilized to synthesize intermetallic nickel aluminide alloy. The first method was combination of powder metallurgy and reaction synthesis (IMC_RS) and the second method was plasma melting to form homogenous plasma melted samples (IMC_PM). XRD patterns for both samples showed complete formation of single phase Ni3Al. Saturation magnetization value for IMC_RS was 0.445 emu/g and IMC_PM was 0.157 emu/g. This was comparable with Ms value of commercial Ni3Al from Alfa Aeser (0.398 emu/g). The reduced elastic modulus, Er value of IMC_PM and IMC_RS were 441.09 MPa. 408.2 MPa respectively. Both samples were exposed to 1%SO2/air gas mixture at 1000oC for 24-hour duration. The isothermal kinetic results for both samples were parabolic indicating rate limiting step. The oxide scales consisted of NiO, NiAl2O4 and Al2O3.

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Periodical:

Advanced Materials Research (Volumes 97-101)

Pages:

386-389

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.97-101.386

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Online since:

March 2010

Authors:

Roslina Ismail, Iskandar Idris Yaacob

Keywords:

High Temperature Oxidation, Nickel Aluminide, Plasma Melting, Reaction Synthesis

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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