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Microstructure and Mechanical Properties of Mechanically Alloyed NiAl

Published online by Cambridge University Press:  26 February 2011

S. J. Hwang ,
P. Nash ,
M. Dollar  and
S. Dymek
S. J. Hwang
Affiliation:
Illinois Institute of Technology, Department of Metallurgical and Materials Engineering, 10 W 33rd St., Chicago, IL 60616, USA
P. Nash
Affiliation:
Illinois Institute of Technology, Department of Metallurgical and Materials Engineering, 10 W 33rd St., Chicago, IL 60616, USA
M. Dollar
Affiliation:
Illinois Institute of Technology, Department of Metallurgical and Materials Engineering, 10 W 33rd St., Chicago, IL 60616, USA
S. Dymek
Affiliation:
Illinois Institute of Technology, Department of Metallurgical and Materials Engineering, 10 W 33rd St., Chicago, IL 60616, USA
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Abstract

Mechanical alloying (MA) has been used to produce NiAl powders from either elemental or prealloyed constituents. The powders were consolidated by hot extrusion resulting in material which was fully dense, with a grain size around 1 μm and a homogeneous distribution of oxide particles with sizes in the range 10 to 100 nm. TEM observation indicates the presence of a significant dislocation density after consolidation. Mechanical properties have been studied by compression testing from room temperature to 1300 K in air. Yield strengths ranged from 1453 MPa to 32 MPa depending on material and test temperature. Work hardening was observed at all test temperatures for both materials. Substantial ductility was observed even at room temperature where it exceeds 7.5 %. The effects of microstructure on the mechanical properties are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 661
Copyright
Copyright © Materials Research Society 1991

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References

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