MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Formation and Growth of A15 Type Nb3Al in a Nb/Al Composite at 1873-2073 K: Part II. Nonplanar Growth of the A15-Phase Layers
Hirokazu OhnoTetsumori ShinodaYoshihiro Oya-Seimiya
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2003 Volume 44 Issue 9 Pages 1736-1740

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Abstract

At the interface between A15-phase layer and Nb solid-solution (NbS.S) region in a bulky Nb/Al composite, a layer of two-phase structure of Nb3Al plus NbS.S is formed when the composite is heated at 2073 K, whereas it is not formed when heated at 2023 K or less. The morphology and width of the two-phase structure layers are significantly influenced by the cooling rate from 2073 K and by the heating time at that temperature. These facts, as well as the theoretical consideration, suggests that the two-phase structure is formed during the cooling process from 2073 K. When cooled more slowly from 2073 K than a certain cooling rate, there observed anomalous growth of A15-phase, which is strongly correlated with formation of the two-phase structure. Most favorite performance of the bulky Nb/Al composite as the super-conducting material is obtained by cooling it at the slowest cooling rate after 1 h heating at 2073 K as far as the present study is concerned.

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© 2003 The Japan Institute of Metals and Materials
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