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Mechanisms of ductility improvement in L12 compounds

Published online by Cambridge University Press:  31 January 2011

Osamu Izumi  and
Takayuki Takasugi
Osamu Izumi
Affiliation:
Institute for Materials Research, Tohoku University, Sendai, Japan
Takayuki Takasugi
Affiliation:
Institute for Materials Research, Tohoku University, Sendai, Japan
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Abstract

The present article first describes some characteristics of structure, chemistry, and electronic (bond) nature for grain boundaries in the A3B Li2-type intermetallic compounds. Next, the phenomenological aspects for the grain boundary brittleness of the Li2-type intermetallic compounds are reviewed with respect to the combination of the constituent atoms, the alloying effect, the stoichiometry effect, and a role of impurity or gaseous atoms. It is emphasized that the brittleness of grain boundaries in the intermetallic compounds is directly controlled by the atomistic and electronic structures at grain boundary regions. Based on these systematic investigations, it is suggested that the brittleness of the Li2-type intermetallic compounds can be manipulated by appropriate control of composition and the corresponding electrochemical bond environment at grain boundary planes and by control of test environment. Furthermore, some examples of the materials development are described.

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Articles
Information
Journal of Materials Research , Volume 3 , Issue 3 , June 1988 , pp. 426 - 440
Copyright
Copyright © Materials Research Society 1988

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