Journal ArticleDOI
Diffusion in the C15-type intermetallic Laves phase NbCo2
Martin Denkinger,Helmut Mehrer +1 more
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In this paper, self-diffusion of both constituents in the Laves phase NbCo2 has been explored using the tracer method and the radioisotopes 57Co and 95Nb in combination with sputter and grinder sectioning.Abstract:
Self-diffusion of both constituents in the Laves phase NbCo2 has been explored using the tracer method and the radioisotopes 57Co and 95Nb in combination with sputter and grinder sectioning. The temperature dependences of the Co diffusivity in Nb31Co69 and Nb29Co71 (two compositions inside the phase field of NbCo2) and of the Nb diffusivity in Nb31Co69 are reported. All activation enthalpies are of similar magnitude. Nb diffusion in NbCo2 is significantly slower than Co diffusion. Co diffusion itself is considerably faster in the alloy with higher Co content. The diffusion results are discussed in connection with the structure of and the scarce information available about atomic defects in NbCo2. We propose that diffusion is mediated by thermal vacancies. Furthermore, the results are compared with self-diffusion data for the C14-type Laves compounds MgZn2 and Tife2, with interdiffusion data obtained from multiphase diffusion experiments in our laboratory, and with self-diffusion in the also close...read more
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Journal ArticleDOI
Laves phases for high temperatures—Part II: Stability and mechanical properties
Armin Von Keitz,Gerhard Sauthoff +1 more
TL;DR: In this article, the hardness and indentation cracking at room temperature as well as the yield and creep at high temperatures in the range 800 − 1400 °C have been studied for various Laves phases AB2 with the transition metals A=Zr, Nb, Ta and B=Cr, Fe, Co with partial substitution of the B elements Fe and Co by Al, which effects a transition from cubic C15 structure to hexagonal C14 structure in the case of Nb(Co,Al)2.
Book ChapterDOI
Diffusion in Metals and Alloys
Zoltán Balogh,Guido Schmitz +1 more
TL;DR: In this article, it was shown that diffusion in solid materials can reach a rate of about a micrometer per second and this rate drops down to about a nanometer per second at half the melting temperature.
Journal ArticleDOI
Formation of AB2-intermetallics by diffusion in the Au–Sb–Bi system
TL;DR: In this article, the diffusion properties of Au2Bi- and AuSb2-intermetallics at 230 and 330 °C were investigated using binary diffusion couples, in which one single-phased product layer is growing between pure elements.
Journal ArticleDOI
Interdiffusion Study in the Fe–Nb System
TL;DR: The diffusion characteristics of the Fe-Nb system were investigated using the diffusion couple technique in this paper, where the average interdiffusion coefficient was calculated for the Fe2Nb Laves and the FeNb μ phases.
References
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Book
Binary alloy phase diagrams
TL;DR: Binary Alloy Phase Diagrams, Second Edition, Plus Updates, on CD-ROM offers you the same high-quality, reliable data you'll find in the 3-volume print set published by ASM in 1990.
Book
Smithells metals reference book
TL;DR: In this paper, the authors present an X-ray analysis of metallic materials and their properties, such as elastic properties, damping capacity and shape memory alloys, as well as their properties of metal and alloys.
Book
Fundamentals of grain and interphase boundary diffusion
TL;DR: Analytical Models of Grain Boundary Diffusion as mentioned in this paper have been proposed for determining grain boundary data, including diffusion along Dislocations and Small Angle Grain Boundaries, in thin films.
Journal ArticleDOI
Intermetallic compounds : principles and practice
J. H. Westbrook,Robert Fleischer +1 more
TL;DR: In this paper, Liu et al. present a survey of Ni3Al as a single phase (C. Liu and D. Kumar) and IMC's as Precipitates and Dispersoids (A. Ardell).