2 edition of Topologically close-packed structures of transition metal alloys found in the catalog.
Topologically close-packed structures of transition metal alloys
Sinha, A. K.
Bibliography: p. 179-185.
|Statement||by A. K. Sinha.|
|Series||Progress in materials science,, v. 15, pt. 2|
|LC Classifications||QC1 .P884 vol. 15 pt. 2, QD921 .P884 vol. 15 pt. 2|
|The Physical Object|
|Number of Pages||185|
|LC Control Number||72195655|
The Structure of Metals and Alloys Volume 1 of Monograph and Report Series - Metals and Metallurgy Trust Issue 1 of Monograph and report series, Metals and Metallurgy Trust: Authors: William Hume-Rothery, R. E. Smallman, Colin William Haworth: Edition: 5: Publisher: Metals & Metallurgy Trust, Length: pages: Export Citation: BiBTeX. Structure and Mechanical Properties of Transition Group Metals, Alloys, and Intermetallic Compounds. Tomasz Czujko (Ed.) Pages: Published: July (This book is a printed edition of the Special Issue Structure and Mechanical Properties of Transition Group Metals, Alloys.
co-ordination. Most metals are close packed - that is, they fit as many atoms as possible into the available atom in the structure has 12 touching neighbours. Such a metal is described as co-ordinated. Each atom has 6 other atoms touching it in each layer. In Ni-base superalloys, the addition of refractory elements such as Cr, Mo, Co, W, and Re is necessary to increase the creep resistance. Nevertheless, these elements induce the formation of different kinds of intermetallic phases, namely, the topologically close-packed (TCP) phases. This work focuses on intermetallic phases present in the second-generation single-crystal (SX) Ni-base.
The Frank–Kasper phases, known as topologically close-packed (tcp) phases, are interesting examples of intermetallic compounds able to accommodate large homogeneity ranges by atom mixing on different sites. Among them, the χ and σ phases present two competing complex crystallographic structures, the stability of which is driven by both geometric and electronic factors. Lesson 3: Atomic Structure and Bonding; Lesson 4: Mechanical Properties; Lesson 5: Structure and Applications of Metals; Lesson 6: Types and Applications of Metal Alloys. Overview; Types of Metal Alloys; What Are Metal Alloys? Why Did it Take So Long? Reading Assignment; Video Assignment: Secrets of the Viking Sword; Aluminum Alloy; Aluminum.
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TOPOLOGICALLY CLOSE-PACKED STRUCTURES OF TRANSITION METAL ALLOYS Ashok K. Sinha W. Keck Laboratory of Engineering Materials California Institute ot Technology Pasadena, California ]'. F 84 TRANSITION METAL ALLOYS the central atom and any atom on the surface of the polyhedron is about 10 less than the distance between the atoms on the Cited by: Get this from a library.
Topologically close-packed structures of transition metal alloys. [A K Sinha]. Topologically close-packed structures of transition metal alloys. Author links open overlay panel Ashok K. Sinha. Show moreCited by: There is an approximate pattern in the structures taken on both by the elements and by substitutional alloys as the transition metals are traversed from the Sc column to the noble metals namely h.c.p.
-* b.c.c. -t.c.p. -* h.c.p. -f.c.c. (1) While only Mn, among the pure elements, crystallizes in a t.c.p. phase, there are many alloys which form Cited by: Topologically close-packed phases in binary transition-metal compounds: matching high-throughput ab initio calculations to an empirical structure map.
T Hammerschmidt 1,2,3, A F Bialon 1, D G Pettifor 2 and R Drautz 1,2. Published 27 November • IOP Publishing and Deutsche Physikalische Gesellschaft New Journal of Physics, Volume 15 Cited by: Ferroniobium topologically close-packed (TCP) phase inclusions were found in the nickel-based nickel-based cladding of dissimilar metal weld joint in pressurized water nuclear reactor.
Sinha:Topologically Close-packed Structures of Transition Metal Alloys, inProgress in Materials Science, B.
Chalmers, J. Christian and T. Massalski, eds. Such packing distinctly resembles that of the topologically close-packed [TCP] crystal structures [13,14], such as the ~ phase, which DISORDERLY STRUCTURES IN TRANSITION METALS Vol.
17, No. 7 have the Icosahedron as well as the. The moments of the electronic density-of-states provide a robust and transparent means for the characterization of crystal structures. Using d-valent canonical tight-binding, we compute the moments of the crystal structures of topologically close-packed (TCP) phases as obtained from density-functional theory (DFT) calculations.
We apply the moments to establish a measure for the difference. β-W is a metastable, topologically close-packed phase with the A15 structure. The deposition of β-W, using N 2 as the impurity gas introduced into the sputtering chamber, is reported and a mechanism for β-W formation is proposed.
Molecules of the impurity gas in the chamber are adsorbed onto the surface during the deposition process and act as nucleation sites for the formation of β-W.
Topologically close-packed (TCP) phases were formed at grain boundaries between WC and Inconel matrix as a result of partial dissolution of WC in a nickel-based alloy. Line analysis of the elements revealed very small interference of the coating in the substrate material when compared to conventional coating methods.
The first volume in this series presents a complete collection of heat of formation data on binary intermetallic compounds that contain at least one transition metal. Both solid compounds and liquid alloys are considered.
Inspired by previous discussions regarding topologically close-packed (TCP) crystals , Tian et al. presented the so-called TCP LSCs which can validly represent the main local structures in. The Frank-Kasper phases of transition-metal alloys are ordered networks of these lines, which, when disordered, provide an appealing model for structure in metallic glasses.
View Show abstract. McEniry et al.  develop a set of potentials for transition metal alloys of Fe, Cr and Mn. This method still explicitly treats the electrons in the system, unlike in empirical potentials.
We have developed atom special quasi-random structures (SQSs) to model the substitutionally random pseudo-binary A3(BC) alloys in L12, D, and D03 crystal structures, respectively.
THE application of X-ray single-crystal and powder methods has shown that the σ-phase structure is based on a tetragonal unit cell, containing 30 atoms, with space group P 4/mnm, P 4mn or P &4bar;n2.
Tight-binding simulation of transition-metal alloys. Eunan J McEniry 1, Georg K H Madsen 1, John F Drain 2 and Ralf Drautz 1. Published 21 June • IOP Publishing Ltd Journal of Physics: Condensed Matter, Vol Number Rhenium is an important alloying agent in catalytic materials and superalloys, but the experimental and computational data on its binary alloys are sparse.
Only 6 out of 28 Re transition-metal systems are reported as compound-forming. Fifteen are reported as phase-separating, and seven have high-temperature disordered σ or χ phases.
Comprehensive high-throughput first-principles calculations. The electronic structure of transition metal Laves A15 transition metals and alloys P Turchi, G Treglia and F Ducastelle-Electronic structure based on the local atomic environment for tight-binding bands R Haydock, V Heine and M J Kelly- They are topologically close packed, ie the interstitial voids are surrounded.
Frank–Kasper (FK) phases, polytetrahedral or topologically close packed (TCP) structures, represent one of the most populated groups of intermetallics.
In contrast to close packed structures of pure metals Mg (hcp) or Cu (ccp), FK phases are formed by two or more metals with distinct atomic sizes leading to different coordination numbers and.Rhenium has a hexagonal close-packed crystal structure, with lattice parameters a = pm and c = pm.
Its usual commercial form is a powder, but this element can be consolidated by pressing and sintering in a vacuum or hydrogen atmosphere. This procedure yields a compact solid having a density above 90% of the density of the metal. Explain why the mechanical properties of bcc metals and alloys differ from those with close packed structures.
Explain the effects of work hardening and annealing on structure and mechanical properties. Explain the mechanical properties of steel in terms of its phase behavior. Understand the structure and mechanical properties of amorphous metals.