High Temperature FeB-type Phases in the Systems Ta-{Ti,Zr,Hf}-B

• DOI: 10.1007/s11669-015-0418-y
• Publication Date: 2015-10-26T14:51:09Z
• Authors: F. Failamani; K. Göschl; G. Reisinger; C. A. Nunes; G. C. Coelho; A. J. S. Machado; L. E. Correa; J. C. P. dos Santos; G. Giester; P. Rogl
• Keywords: Electron probe microanalysis

Novel FeB-type phases have been evaluated in the systems Ta-{Ti,Zr,Hf}-B either from as cast or arc treated samples by x-ray powder and single crystal diffraction as well as electron probe microanalysis. In each of the three systems the formation of the FeB-type phase suggests a high temperature stabilization of a binary group IV metal monoboride with FeB-type. This holds true for Ti and Hf, while for Zr the single crystal study of (Ta,Zr)B proves that it is a true ternary phase, as no stable monoboride exists in the binary Zr-B system. EPMA analyses reveal that the FeB-type phases Ta{Ti,Zr,Hf}B are formed by substitution of Ta in TaB by rather small amounts of group IV elements (~3 at.% of Zr, ~7 at.% Hf, and ~10 at.% Ti).