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Environmental Effects on Mechanical Disordering of Ni3Al-Base Alloy

Published online by Cambridge University Press:  01 January 1992

S. Gialanella
Affiliation:
Dipto di Ingegneria dei Materiali, Università di Trento, 38050, Mesiano, Trento, Italy
M. Guella
Affiliation:
Dipto di Ingegneria dei Materiali, Università di Trento, 38050, Mesiano, Trento, Italy
F. Marino
Affiliation:
Dipto di Scienza dei Materiali e Ingegneria Chirnica, Pol. di Torino, 10129, Torino, Italy
M.D. Baro'
Affiliation:
Dept. de Fisica, Universitat Aut. de Barcelona, 08193, Bellaterra, Barcelona, Spain
J. Malagelada
Affiliation:
Dept. de Fisica, Universitat Aut. de Barcelona, 08193, Bellaterra, Barcelona, Spain
S. Surinach
Affiliation:
Dept. de Fisica, Universitat Aut. de Barcelona, 08193, Bellaterra, Barcelona, Spain
R.W. Cahn
Affiliation:
Dept. of Mat. Sci. and Metallurgy, Univ. of Cambridge, CB23QZ, Cambridge, U.K.
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Abstract

We present some results regarding the influence of grinding atmosphere on the phenomena occurring during mechanical milling of a Ni3Al-base alloy. We have disordered this permanently ordered alloy by ball-milling in a vibratory mill, using alternatively argon and hydrogen atmospheres. We observed a slower reduction of the long-range order parameter during experiments carried out under a hydrogen atmosphere, regardless of the used grinding media. We discuss our Findings in terms of the effects, such as in grain boundary cohesive strength or localize ductility enhancement, that hydrogen may induce in such alloy. The microstructural parameters of the powders at different stages of disordering have been investigated using calorimetric tests, x-ray diffraction analysis and microscopic observations.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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