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Effect of iron additions on structure of Laves phases in NbCrFe alloys

✍ Scribed by M. Grujicic; S. Tangrila; O.B. Cavin; W.D. Porter; C.R. Hubbard

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
851 KB
Volume
160
Category
Article
ISSN
0921-5093

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✦ Synopsis

The effect of iron additions on the stability of various Laves phases in the Nb-Cr base system has been examined. In the binary Nb-Cr system a hexagonal (CI 4) Laves phase exists at temperatures above approximately 1860 K, and undergoes a shear-like martensitic transformation to a face centered cubic (C15) Laves phase on cooling to room temperature. Addition of iron promotes formation of an additional phase, the dihexagonal (C36) Laves phase. In alloys with a lower iron content (below approximately 5 wt.%), the C36 phase forms at higher temperatures. In addition, the C15 phase begins to form on cooling to room temperature. In sharp contrast, in alloys with a higher iron content, only the C14-* C36 phase transformation takes place in the entire temperature range studied (RT 1473 K). These findings were rationalized on the basis of the effects of chemical energy change and elastic strain energy on magnitude of the activation energy for martensitic transformation.

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