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Effect of APB Microsegregation on the Strength of Ni3Al with Ternary Additions

Published online by Cambridge University Press:  26 February 2011

Y.P. WU ,
J.M. Sanchez  and
J.K. Tien
Y.P. WU
Affiliation:
Columbia University, Henry Krumb School of Mines, New York, NY 10027
J.M. Sanchez
Affiliation:
The University of Texas, Strategic Materials R&D Laboratory, Center for Materials Science and Engineering, Austin, TX 78712
J.K. Tien
Affiliation:
The University of Texas, Strategic Materials R&D Laboratory, Center for Materials Science and Engineering, Austin, TX 78712
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Abstract

Solid solution strengthening for stoichiometric and non-stoichiometric alloys is studied using a microscopic model that takes into account the micro-segregation of the alloying additions and of the host atoms to antiphase boundaries. Experimental results for four ternary intermetallic compounds, Ni-Al-Si, Ni-Al-Ti, Ni-Al-Hf and Ni-Al-V, are analyzed in the light of the theoretical model. It is found that the athermal increment of yield strength for both stoichiometric and non-stoichiometric alloys can be explained using solid solution strengthening theory provided that the local concentration at the {111} antiphase boundaries between superpartial dislocations is used.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 87
Copyright
Copyright © Materials Research Society 1991

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