Dual ferroelasticity of lanthanum chromium-based multicomponent solid solution perovskite

2009 ◽  
Vol 60 (9) ◽  
pp. 783-786 ◽  
Author(s):  
Nina Orlovskaya ◽  
Mykola Lugovy ◽  
Dmytro Verbylo ◽  
Michael John Reece
Keyword(s):  
Solid Solution ◽  
Multicomponent Solid Solution

Effect of Al, Cr, Mo, Zr, Si, and C on the temperature ranges of hardening of multicomponent niobium-based alloys

2020 ◽  
Vol 2020 (01) ◽  
pp. 67-76
Author(s):  
M. P. Brodnikovskyy ◽  
◽  
A. S. Kulakov ◽  
M. O. Krapivka ◽  
U. E. Zubets ◽  
...  
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Strain Rate ◽  
Second Phase ◽  
Niobium Alloys ◽  
Dispersed Particles ◽  
Multicomponent Solid Solution ◽  
Wide Range ◽  
Temperature Ranges ◽  
Temperature Hardening

The effect of alloying and the strain rate on the occurrence and features of the manifestation of temperature ranges in which the strengthening of niobium alloys doped with Ti, Al, Cr, Mo, Zr, Si, C occurs was studied. It was found that in multicomponent solid solutions based on niobium up to sufficiently high temperatures more efficient hardening is provided than in precipitation hardened carbide alloys. It is shown that in multicomponent niobium alloys, which are a solid solution, the selection of alloying can be used to control the manifestation of a high-temperature hardening peak in a wide range. It is possible to change the temperature range of the peak manifestation, its height, sensitivity to the strain rate. The appearance of a high-temperature hardening peak is explained by the loss of stability of the multicomponent solid solution upon deformation in the dislocation field, which leads to the precipitation of dispersed particles of the second phase that pin the dislocations. Keywords: multicomponent niobium alloys, structure, temperature dependence of strength.

Electro-Mechano-Chemistry; Transport Problem in Four Time Scales

2007 ◽  
Vol 129 ◽  
pp. 11-18 ◽  
Author(s):  
Marek Danielewski ◽  
Maciej Pietrzyk ◽  
Bartłomiej Wierzba
Keyword(s):  
Solid Solution ◽  
Equation Of State ◽  
Mass Transport ◽  
Chemical Potential ◽  
Continuity Equations ◽  
Multicomponent Solid Solution ◽  
Ni Alloy ◽  
Potential Gradients ◽  
Transport Problems ◽  
Chemical Potential Gradients

The mass transport in the presence of stress, electrical, mechanical and chemical potential gradients in multicomponent solid solution is analyzed. The method bases on the Darken concept and the calorimetric equation of state. We effectively coupled the conservation of the mass (continuity equations), energy, momentum and Gauss equations. The diffusion fluxes of the components are given by the Nernst-Planck formulae and take into account the electro-chemical and mechanical potentials. We simulate the deformation field during the diffusion caused by the gradients of the chemical potential of all elements in non-ideal Fe-Cu-Ni alloy. The simulations show that the model is compatible with experimental results, and can be effectively used for modelling the energy, momentum and mass transport problems in compressible multicomponent solid solutions. The numerical problems and methods of solution are presented.

Composition Dependent Diffusivities in Multi-Component Systems

2011 ◽  
Vol 312-315 ◽  
pp. 127-131 ◽  
Author(s):  
Bartek Wierzba ◽  
Marek Danielewski
Keyword(s):  
Solid Solution ◽  
Inverse Problem ◽  
Real Number ◽  
Inverse Method ◽  
Computation Method ◽  
Diffusion Multiple ◽  
Multicomponent Solid Solution ◽  
Component Systems ◽  
Fe Alloys

The modified Redlich-Kister approximation of the composition dependent intrinsic diffusivities in the multicomponent solid solution is presented. The effective computation method (the inverse problem) combines the Hierarchical Genetic Strategy with real number encoding (HGS-FP) with the modified Redlich-Kister approximation. The Cu–Ni–Fe alloys at 1271 K are analyzed. We show that the measured intrinsic diffusivities, the estimated from available diffusivity data and calculated by inverse method are in agreement. The presented method may become a very effective tool when the diffusion multiple technique is considered.

Multicomponent solid-solution semiconductor lasers

1977 ◽  
Vol 13 (8) ◽  
pp. 609-611 ◽  
Author(s):  
L. Dolginov ◽  
L. Druzhinina ◽  
P. Eliseev ◽  
I. Kryukova ◽  
V. Leskovich ◽  
...  
Keyword(s):  
Solid Solution ◽  
Semiconductor Lasers ◽  
Multicomponent Solid Solution

A General Synthesis of Cu−In−S Based Multicomponent Solid-Solution Nanocrystals with Tunable Band Gap, Size, and Structure

2010 ◽  
Vol 114 (41) ◽  
pp. 17293-17297 ◽  
Author(s):  
Xiaolei Wang ◽  
Daocheng Pan ◽  
Ding Weng ◽  
Chen-Yian Low ◽  
Lynn Rice ◽  
...  
Keyword(s):  
Solid Solution ◽  
Band Gap ◽  
Gap Size ◽  
Multicomponent Solid Solution ◽  
General Synthesis ◽  
Tunable Band Gap ◽  
Size And Structure

NiAl precipitation in Fe-12w/o Cr-5w/o Ni-4w/o Al

1983 ◽  
Vol 41 ◽  
pp. 202-203
Author(s):  
L.E. Murr ◽  
J.S. Dunning ◽  
S. Shankar
Keyword(s):  
Solid Solution ◽  
Stainless Steel ◽  
Stainless Steels ◽  
Alloy Composition ◽  
Chromium Content ◽  
Scale Up ◽  
Optical Metallography ◽  
Property Evaluation ◽  
310 Stainless Steel ◽  
Microstructural Studies

Aluminum additions to conventional 18Cr-8Ni austenitic stainless steel compositions impart excellent resistance to high sulfur environments. However, problems are typically encountered with aluminum additions above about 1% due to embrittlement caused by aluminum in solid solution and the precipitation of NiAl. Consequently, little use has been made of aluminum alloy additions to stainless steels for use in sulfur or H2S environments in the chemical industry, energy conversion or generation, and mineral processing, for example.A research program at the Albany Research Center has concentrated on the development of a wrought alloy composition with as low a chromium content as possible, with the idea of developing a low-chromium substitute for 310 stainless steel (25Cr-20Ni) which is often used in high-sulfur environments. On the basis of workability and microstructural studies involving optical metallography on 100g button ingots soaked at 700°C and air-cooled, a low-alloy composition Fe-12Cr-5Ni-4Al (in wt %) was selected for scale up and property evaluation.

Solid Solution Effects and Deformation Micros trueture of Shock-Loaded Iron Manganese Alloys

1970 ◽  
Vol 28 ◽  
pp. 420-421
Author(s):  
A. Christou ◽  
J. V. Foltz ◽  
N. Brown
Keyword(s):  
Solid Solution ◽  
Shock Loading ◽  
High Strain ◽  
Local Stress ◽  
Strain Rates ◽  
Local Stress Concentration ◽  
Bcc Metals ◽  
Manganese Alloys ◽  
Iron Manganese ◽  
Transmission Microscope

In general, all BCC transition metals have been observed to twin under appropriate conditions. At the present time various experimental reports of solid solution effects on BCC metals have been made. Indications are that solid solution effects are important in the formation of twins. The formation of twins in metals and alloys may be explained in terms of dislocation mechanisms. It has been suggested that twins are nucleated by the achievement of local stress-concentration of the order of 15 to 45 times the applied stress. Prietner and Leslie have found that twins in BCC metals are nucleated at intersections of (110) and (112) or (112) and (112) type of planes.In this paper, observations are reported of a transmission microscope study of the iron manganese series under conditions in which twins both were and were not formed. High strain rates produced by shock loading provided the appropriate deformation conditions. The workhardening mechanisms of one alloy (Fe - 7.37 wt% Mn) were studied in detail.

Fine Microstructure of a Mechanically Alloyed Oxide Dispersion Strengthened Nickel-Base Superalloy

1977 ◽  
Vol 35 ◽  
pp. 298-299
Author(s):  
Jordi Marti ◽  
Timothy E. Howson ◽  
David Kratz ◽  
John K. Tien
Keyword(s):  
Solid Solution ◽  
Volume Fraction ◽  
Stress Rupture ◽  
Oxide Dispersion Strengthened ◽  
Solid Solution Alloy ◽  
Oxide Dispersion ◽  
Creep And Stress Rupture ◽  
Mechanically Alloyed ◽  
Fine Microstructure ◽  
Nickel Base

The previous paper briefly described the fine microstructure of a mechanically alloyed oxide dispersion strengthened nickel-base solid solution. This note examines the fine microstructure of another mechanically alloyed system. This alloy differs from the one described previously in that it is more generously endowed with coherent precipitate γ forming elements A1 and Ti and it contains a higher volume fraction of the finely dispersed Y2O3 oxide. An interesting question to answer in the comparative study of the creep and stress rupture of these two ODS systems is the role of the precipitate γ' in the mechanisms of creep and stress rupture in alloys already containing oxide dispersoids.The nominal chemical composition of this alloy is Ni - 20%Cr - 2.5%Ti - 1.5% A1 - 1.3%Y203 by weight. The system receives a three stage heat treatment-- the first designed to produce a coarse grain structure similar to the solid solution alloy but with a smaller grain aspect ratio of about ten.

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