Prediction of saturation magnetostriction in solid-solution ternary alloys

2017 ◽  
Vol 52 (22) ◽  
pp. 13227-13236
Author(s):  
Javier A. Moya ◽  
Marco Coisson
Keyword(s):  
Solid Solution ◽  
Ternary Alloys ◽  
Saturation Magnetostriction

High Temperature Creep Behavior and Effects of Stacking Fault Energy in Mg-Y and Mg-Y-Zn Dilute Solid Solution Alloys

2014 ◽  
Vol 783-786 ◽  
pp. 491-496
Author(s):  
Mayumi Suzuki ◽  
Yasuyuki Murata ◽  
Kyosuke Yoshimi
Keyword(s):  
Activation Energy ◽  
Solid Solution ◽  
Creep Behavior ◽  
Ternary Alloys ◽  
Dislocation Creep ◽  
Prismatic Slip ◽  
Dislocation Slip ◽  
Self Diffusion ◽  
Controlling Mechanism ◽  
Hot Rolled

Compressive creep behavior of hot-rolled (40%) Mg-Y binary and Mg-Y-Zn ternary dilute solid solution alloys are investigated in this study. Creep strength is substantially improved by the addition of zinc. Activation Energy for creep in Mg-Y and Mg-Y-Zn alloys are around 200 kJ/mol at the temperature range from 480 to 570 K. These values are higher than the activation energy for self-diffusion coefficient in magnesium (135 kJ/mol). Many stacking faults, which are planar type defects are observed on the basal planes of the magnesium matrix in Mg-Y-Zn ternary alloys. TEM observation has been revealed that the non-basal a-dislocation slip is significantly activated by these alloys. The rate controlling mechanism of Mg-Y and Mg-Y-Zn dilute alloys are considered to the cross-slip or prismatic-slip controlled dislocation creep with high activation energy for creep, more than 1.5 times higher than the activation energy for creep controlled dislocation climb.

The effective valencies of transition metals in solid solution in gold and silver alloys

1962 ◽  
Vol 267 (1330) ◽  
pp. 313-328 ◽  
Keyword(s):  
Solid Solution ◽  
Transition Metal ◽  
Transition Metals ◽  
Manganese Content ◽  
Axial Ratio ◽  
Ternary Alloys ◽  
Exact Nature ◽  
Atom Ratio ◽  
Electron Atom ◽  
Manganese Alloys

In ternary alloys based on the solution of a third metal in binary close-packed hexagonal 3/2 electron compounds (ζ-phases) it is observed that the axial ratio of the structure is essentially constant at a constant value of the valency electron concentration. From determinations of the lattice spacings of solid solutions of manganese, iron and nickel in the gold-tin ζ-phase, and of manganese in the silver-tin ζ-phase, the effective contributions of electrons to the conduction band of the alloys by the transition metal have been deduced. The maximum effective contributions made by iron and nickel are respectively 1 and 0·8 electron per atom; in both cases the effective valency decreases both with increase in electron: atom ratio and with increase in transition metal content. The maximum effective contribution of manganese is two electrons per atom in gold-tin-manganese alloys, and approximately 1·8 in silver-tin-manganese alloys. Again the values decrease with increasing electron: atom ratio and increasing manganese content. The results are discussed in terms of the existence of virtual bound 3 d states associated with the transition metal. Considered together with previous results obtained on solutions of transition metals in the copper-germanium ζ-phase, they demonstrate the dependence of the effective valencies of transition metals in solid solution in noble metal alloys on the exact nature of the environment of the dissolved atoms.

Estimation of Interfacial Energies Based on the Shapes of Coherent Intragranular Precipitates

1999 ◽  
Vol 5 (S2) ◽  
pp. 864-865
Author(s):  
Xiao Chen ◽  
L. Rabenberg
Keyword(s):  
Solid Solution ◽  
Surface Energy ◽  
Interfacial Energy ◽  
Elastic Anisotropy ◽  
Ternary Alloys ◽  
Interfacial Energies ◽  
Simultaneous Measurements ◽  
Precise Shape ◽  
Invar Composition ◽  
Favorable Conditions

In a study of the precipitation and aging of Invar particles in Cu, we observed that the particles evolved from spherical to cuboidal as they grew in size. This behavior has been observed in other systems, and predicted by Voorhees et al. ; they showed that the precise shape of the particle is a balance between elastic anisotropy and surface energy. The correlation between our results and their predictions are very good. It is the purpose of this note to point out that simultaneous measurements of size, shape, and mismatch of a coherent particle can be used to estimate the interfacial energy under favorable conditions.Ternary alloys consisting of Cu - 12.8 wt% Ni -7.2 wt% Fe were arc-melted, held at 1030°C to develop extended regions of the Cu-rich solid solution, quenched, then aged at various times and temperatures to develop FCC precipitates near the Invar composition in the FCC Cu matrix.

Neutron diffraction of Cu–Zn–Sn ternary alloys: non-invasive assessment of the compositions of historical bronze/brass copper ternary alloys

2017 ◽  
Vol 50 (1) ◽  
pp. 49-60 ◽  
Author(s):  
Elisabetta Gliozzo ◽  
Winfried A. Kockelmann ◽  
Gilberto Artioli
Keyword(s):  
Solid Solution ◽  
Neutron Diffraction ◽  
Inductively Coupled Plasma ◽  
Lattice Parameter ◽  
Small Sample ◽  
Ternary Alloys ◽  
Crystallographic Structure ◽  
Present Sample ◽  
Non Invasive ◽  
Sample Set

Neutron diffraction can be used as a tool for the characterization of metal materials in a totally non-invasive mode. In binary alloys with two elements in solid solution, crystallographic structure analysis provides information on the overall element compositions of the metal, based on the linear relationship between elemental fractions and lattice parameters known as Vegard's rule. However, for ternary solid-solution alloys the derivation of the overall metal composition is not straightforward because the problem is mathematically underdetermined. A number of artificially produced samples in the ternary system Cu–Zn–Sn, widely used in antiquity for gunmetal, were investigated by time-of-flight neutron diffraction, inductively coupled plasma mass spectroscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy and electron microprobe analysis. The multi-analysis approach allows definition of the limits and capabilities of neutron diffraction for obtaining the overall composition of a small sample set of ternary alloys, and thus moves the methodical approach a step forward even though it is applicable to the present sample set only. A relation showing an increasing Cu and Sn fraction counterbalanced by decreasing Zn content is presented, which allows the determination of the δ-phase composition from a lattice parameter measurement. Furthermore, the observed Zn loss up to 1.8 wt% for each melting step is of significance for the reconstruction of ancient technologies.

scholarly journals Microstructural Evolution of Mo-Si-B Ternary Alloys through Heat Treatment at 1800°C

2011 ◽  
Vol 278 ◽  
pp. 527-532 ◽  
Author(s):  
Kyosuke Yoshimi ◽  
Soeng Ho Ha ◽  
Kouichi Maruyama ◽  
Rong Tu ◽  
Takashi Goto
Keyword(s):  
Heat Treatment ◽  
Phase Diagram ◽  
Solid Solution ◽  
Microstructural Evolution ◽  
Alloy Composition ◽  
Equilibrium Phase ◽  
Secondary Phase ◽  
Equilibrium Phase Diagram ◽  
The Other ◽  
Ternary Alloys

First of all, the as-cast microstructures of Mo-rich Mo-Si-B ternary alloys were investigated around the triple junction point of the primary Mo solid solution, Mo5SiB2 and Mo2B in this work, based on the liquidus projections of the Mo-Si-B system which have been reported in earlier studies. Subsequently, their microstructural evolution through heat treatment was investigated. Since Mo2B crystallizes out during solidification into a primary or secondary phase even though the alloy composition lies in the triangle of Mo-Mo5SiB2-Mo3Si in the Mo-Si-B equilibrium phase diagram, the as-cast microstructures include the non-equilibrated Mo2B in wide compositional ranges. However, Mo2B was completely decomposed during heat treatment at 1800 °C for 24 h and this contributed to the development of homogeneous, fine microstructures. On the other hand, since Mo2B was not decomposed perfectly during 24 h of 1600 °C heat treatment, as-cast microstructures largely remained. Therefore, it is realized that the heat treatment at 1800 °C is necessary to obtain well-developed microstructures of Mo-Si-B alloys.

The Microstructure of Nb3Al-Mo Intermetallics

1994 ◽  
Vol 364 ◽  
Author(s):  
E. Passa ◽  
P. Tsakiropoulos
Keyword(s):  
Solid Solution ◽  
Grain Size ◽  
Room Temperature ◽  
Rapid Quenching ◽  
Ternary Alloys ◽  
Complete Solid Solubility ◽  
Melt Spun ◽  
B2 Phase ◽  
Melt Spun Ribbons ◽  
A15 Phase

AbstractThe microstructure of arc melted ingots and melt-spun ribbons of Nb-18A1, Nb-18Al-(20–40) Mo (at%) were studied. Rapid quenching from the melt refined the grain size by at least two orders of magnitude. In the binary alloy ingots and ribbons the Nb3Al (A15) and B2 phases were present. Molybdenum exhibited complete solid solubility in the bcc Nb-Al solid solution as well as in the Nb3Al (A15 phase). The former was the only phase present in the ribbons of the ternary alloys, while Nb3Al was detected only in the ingots. B2 phase was formed in the alloy with 20 at% Mo and the A2 phase was present in the alloy with 40 at% Mo. Furthermore, Mo addition increased the room temperature microhardness of the Nb-Al solid solution by ≈7 Kgmm−2/ at%Mo.

scholarly journals Ambient Zinc K-Edge Extended X-Ray Absorption Fine Structure Studies on Solid Solution Hardening of the Ternary Alloys

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Shabina Khan ◽  
Javed Mazher ◽  
Pankaja Singh
Keyword(s):  
Solid Solution ◽  
Bond Length ◽  
Ternary Systems ◽  
Ternary Alloys ◽  
Solid Solution Hardening ◽  
Solution Hardening ◽  
X Ray ◽  
Absorption Fine ◽  
Multiple Paths ◽  
X Ray Absorption

Solid solution hardening can be introduced in the zinc selenide by cationic substitution alloying. We are presenting our studies on gradual development of the hardening and the bond-length variations among the heavily Be-doped ternary alloys of . These compositionally vivid ternary systems are grown by the Bridgman technique, and a set of careful measurements of synchrotron-based Zn core X-ray absorption spectroscopy are performed on the mixed alloy, which is followed by extraction of useful oscillations of extended X-ray absorption fine structures. A detailed ab initio analysis is also carried out for the mixed alloy’s theoretical EXAFS simulations, and suitable data processing codes are used for the subsequent experimental spectra fittings. Various X-ray scattering single and multiple paths around the core atomic environ are simulated and compared with the spectroscopic results. With the aid of as-found parametric values, the hardening and crystalline disorders are discussed and explained in the midst of the multimodal bond-length behaviors and changes induced by the increased alloying amid as-found pseudocrystalline stabilities.

Effect of Particle Size of Mo Solid Solution on Hardness of Mo5SiB2/Mo-Based Alloys

2008 ◽  
Vol 1128 ◽  
Author(s):  
Kyosuke Yoshimi ◽  
Yusuke Kondo ◽  
Kouichi Maruyama
Keyword(s):  
Solid Solution ◽  
Particle Size ◽  
Vickers Hardness ◽  
Volume Fraction ◽  
Average Particle Size ◽  
Ternary Alloys ◽  
Average Particle ◽  
Ductile Phase ◽  
Cracking Behavior ◽  
Fine Microstructure

AbstractThree kinds of Mo-Si-B ternary alloys and a 1 at.% Al added Mo-Si-B alloy with the compositions near Mo-8.7 at.% Si-17.4 at.% B that is in the Mo5SiB2 and Mo two-phase compositional region were produced by Ar arc-melting followed by the heat treatment at 1800 °C for 24 h. These alloys have the characteristic fine microstructure composed of small Mo solid solution (Moss) particles in the Mo5SiB2 (T2) matrix with the primary phase (Moss or T2 depending on composition). The volume fraction of the Moss particles ranges from 25.5 to 30.5 % and its average size from 3.0 to 6.4 μm in the fine microstructure of the alloys. Micro cracks were introduced by Vickers hardness tests into the microstructures, and their propagation is disturbed by the small Moss particles. Thus, each hardness value seems to relate to the cracking behavior around each indent. On the other hand, Vickers hardness values do not show correlation with the volume fraction of the Moss particles, but clearly decrease with increasing the average particle size of Moss. Therefore, it should be concluded that the increase in the particle size of Moss could enhance the toughness of the Mo5SiB2/Mo-based alloys effectively by ductile phase toughening.

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