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Early Stages of Decomposition in Ni-Rich Ni-Ti

Published online by Cambridge University Press:  15 February 2011

M. Kompatscher ,
B. Demé ,
J. Hecht ,
H. Heinrich ,
J. Kohlbrecher ,
J.-M. Schneider ,
B. Schönfeld  and
G. Kostorz
M. Kompatscher
Affiliation:
ETH Zürich, Institute of Applied Physics, CH-8093 Zürich, Switzerland
B. Demé
Affiliation:
Institut Laue-Langevin, F-38042 Grenoble, France
J. Hecht
Affiliation:
ETH Zürich, Institute of Applied Physics, CH-8093 Zürich, Switzerland
H. Heinrich
Affiliation:
ETH Zürich, Institute of Applied Physics, CH-8093 Zürich, Switzerland
J. Kohlbrecher
Affiliation:
Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
J.-M. Schneider
Affiliation:
ETH Zürich, Institute of Applied Physics, CH-8093 Zürich, Switzerland
B. Schönfeld
Affiliation:
ETH Zürich, Institute of Applied Physics, CH-8093 Zürich, Switzerland
G. Kostorz
Affiliation:
ETH Zürich, Institute of Applied Physics, CH-8093 Zürich, Switzerland
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Abstract

In-situ small-angle neutron scattering was performed on Ni-(10 to 12) at.% Ti polycrystals and single crystals at temperatures between 870 and 1270 K. During decomposition metastable precipitates of cuboidal shape form with preferred alignement along <100>. The Ti concentration of these precipitates is 17(1) at.% (between 870 and 950 K). Metastable precipitates precede the formation of platelets of the stable η phase even outside the hitherto accepted metastable miscibility gap.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 580: Symposium E – Nucleation & Growth Processes in Materials , 1999 , 63
Copyright
Copyright © Materials Research Society 2000

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