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Production and Characterization of Nanostructured Ti-Based Intermetallics

Published online by Cambridge University Press:  10 February 2011

H. A. Calderónt ,
V. Garibay-Febles ,
A. Cabrera ,
M. Umemoto ,
J. G. Cabañas-Morenol  and
K. Tsuchiya
H. A. Calderónt
Affiliation:
Instituto Politécnico Nacional, México D.F. 07738, [email protected].
V. Garibay-Febles
Affiliation:
Instituto Politécnico Nacional, México D.F. 07738, [email protected].
A. Cabrera
Affiliation:
Instituto Politécnico Nacional, México D.F. 07738, [email protected].
M. Umemoto
Affiliation:
Production Systems Engineering, Toyohashi University of Technology, Tempakucho, Toyohashi, Aichi, 441 Japan.
J. G. Cabañas-Morenol
Affiliation:
Instituto Politécnico Nacional, México D.F. 07738, [email protected].
K. Tsuchiya
Affiliation:
Production Systems Engineering, Toyohashi University of Technology, Tempakucho, Toyohashi, Aichi, 441 Japan.
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Abstract

Mechanical alloying and plasma assisted sintering are used to produce nanocrystalline Ti-Al alloys. Microstructural characterization and measurement of mechanical properties are reported. The alloys investigated include AITi+X and Al3Ti+X where X represents either Cr, Mn or Fe. Mechanical alloyed powders have a microstructure, which consist of an amorphous matrix containing small crystalline domains. Sintered specimens have a crystalline microstructure with nano-sized grains. Alloys based on AlTi-X are composed mainly of the phases α 2 (DO19) and γ (Ll0) distributed homogeneously in the form of nanograins (100–300 nm) resembling a globular structure. Al3Ti-X alloys show a cubic ordered phase (L12) with grain sizes ranging from 16 to 40 nm. Vickers hardness measurements of sintered alloys show a considerable increase with respect to as-cast alloys. Compression tests show a high mechanical strength of these alloys, although in the case of A13Ti-X, no ductility is found.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK5.6.1
Copyright
Copyright © Materials Research Society 1999

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References

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