Relation between physical properties and phase transformations in alloys of the Ti−W−Zr−Al system

1997 ◽  
Vol 39 (11) ◽  
pp. 489-492
Author(s):  
É. I. Illarionov
Keyword(s):  
Physical Properties ◽  
Phase Transformations

scholarly journals Crystal Dislocations: Their Impact on Physical Properties of Crystals

Crystals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 413
Author(s):  
Peter Lagerlof
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Crystal Growth ◽  
Physical Properties ◽  
Phase Transformations ◽  
Electronic Properties ◽  
Martensitic Phase ◽  
Martensitic Phase Transformations

It is rare to find technical applications involving a material of any crystal structure that is not impacted by dislocations—which affect the material’s mechanical properties, interfaces, martensitic phase transformations, crystal growth, and electronic properties, to name a few. [...]

Mechanisms Underlying Hardness Numbers

2004 ◽  
Vol 841 ◽  
Author(s):  
John J. Gilman
Keyword(s):  
Shear Modulus ◽  
Physical Properties ◽  
Phase Transformations ◽  
Band Gap ◽  
Chemical Bonding ◽  
Formation Energy ◽  
Conventional Wisdom ◽  
Indentation Hardness ◽  
Ionic Charge ◽  
Empirical Property

ABSTRACTRelationships of indentation hardness numbers to to other physical properties are demonstrated. They differ depending on the type of chemical bonding; metals, alloys ionic, covalent, and metal-metalloid. The properties are: shear modulus; ionic charge; band-gap density; polarizability; and formation energy, respectively. In each case the rationale is provided. The concept of a “bonding Modulus” is introduced. It is concluded that the conventional wisdom that hardness is a purely empirical property does not hold. Phase transformations and indentation hardness are connected broadly.

scholarly journals Physical Properties Of Rare Earth Elements

2021 ◽  
Vol 03 (01) ◽  
pp. 79-88
Author(s):  
Davron Rakhmonovich Djuraev ◽  
◽  
Mokhigul Madiyorovna Jamilova ◽  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Physical Properties ◽  
Phase Transformations ◽  
Rare Earth Metals ◽  
Economic Effect ◽  
Structure And Properties ◽  
Structure And Stability ◽  
Ongoing Phase

The article studies the physical properties of rare earth metals, pays special attention to their unique properties, studies the main aspects of the application of rare earth metals in industry. Also, the structure and stability of various forms of sesquioxides of rare earth elements, in particular, europium, as well as the effect of the method of oxide preparation on its structure and properties are considered. The analysis of the ongoing phase transformations of rare earth metals is made. The article emphasizes the use of correct choices to achieve a large technical and economic effect when using rare earth metals in industry. The article is intended for teachers working in the field of physics and chemistry, as well as for students of the specialty "physics and chemistry".

Crystal structure and physical properties of sophiite, Zn2(SeO3)Cl2, a new mineral

1992 ◽  
Vol 56 (383) ◽  
pp. 241-245 ◽  
Author(s):  
T. F. Semenova ◽  
I. V. Rozhdestvenskaya ◽  
S. K. Filatov ◽  
L. P. Vergasova
Keyword(s):  
Crystal Structure ◽  
Physical Properties ◽  
Single Crystal ◽  
Phase Transformations ◽  
Structural Aspect ◽  
Experimental Results ◽  
New Mineral ◽  
X Ray ◽  
Atomic Arrangement ◽  
Thermal Phase

AbstractThe crystal structure of sophiite, Zn2(SeO3)Cl2 (a = 10.251(4), b = 15.223(2), c = 7.666(5) Å, Z = 8) was solved in space group Pccn from single crystal X-ray data, and refined to R = 0.053 for 666 Fo > 4oFo. The mineral belongs to layer compounds. The threefold coordinated Se atom is at the apex of a pyramid, the base of which is formed by three O atoms; Se-O = 1.69 Å. Zn cations occupy two positions with distorted tetrahedral and octahedral coordinations. In the tetrahedra, Zn cations are surrounded by two O (2.02 Å) and two Ci (2.224 Å) atoms. Zn octahedra contain four O atoms (2.07 Å) and two CI atoms (2.701 Å). The atomic arrangement is characterized by rings containing two Se pyramids linked by their corners to two Zn tetrahedra. The rings are linked by their edges and corners to Zn octahedra to form layers parallel to (010). The layers are interconnected by residual Van der Waals bonds.Experimental results on thermal phase transformations and deformations, crystal optics and other physical properties of sophiite are presented. A structural aspect of their anisotropy is discussed.

Study of Thermo-Physical Properties of Selected Nickel-Based Superalloys With Use of DTA Method

2012 ◽  
Author(s):  
Jana Dobrovska ◽  
Simona Zla ◽  
Frantisek Kavicka ◽  
Bedrich Smetana ◽  
Vlastimil Vodarek
Keyword(s):  
Phase Transformation ◽  
Physical Properties ◽  
Phase Transformations ◽  
Solidus Temperature ◽  
Experimental System ◽  
Reaction Scheme ◽  
Transformation Temperatures ◽  
Heating And Cooling ◽  
Temperature Heating ◽  
Thermo Physical Properties

The presented paper deals with study of thermo-physical properties of cast complex alloyed nickel based superalloys IN713LC, IN738LC and IN792-5A. In this work the technique of Differential Thermal Analysis was selected for acquisition and comparison of the phase transformation temperatures. The samples taken from superalloys in as received state were analysed at heating and cooling rates of 1, 5, 10, and 20 K/min using the experimental system Setaram SETSYS 18TM. Moreover, the transformation temperatures for zero heating/cooling rate were calculated. Based on a comparison of these temperatures it is possible to make the following conclusions: (i) The alloy IN792-5A has the highest temperature of solubility of the strengthening phase γ′ (1235°C); (ii) the highest liquidus temperature (heating) obtained by extrapolation was found in the alloy IN713LC (1349°C), the lowest solidus temperature (heating) was found for the alloy IN738LC (1212°C); (iii) At cooling an undercooling occurred in all alloys. In general it may be stated that the biggest under-cooling (TS, 47°C) was recorded in the alloy IN792 5A; (iv) The width of the interval of the heat treatment window was the biggest in alloy IN713LC (44°C); (v) The alloy IN738LC is characterised by the widest interval of melting (124°C) and solidification (134°C), while the alloy IN792 5A has the narrowest interval of melting (82°C) and at the same time almost the same interval of solidification as the alloy IN738LC (129°C); (vi) The obtained phase transformation temperatures were compared with the values of phase transformations temperatures calculated on the basis of established relationships. In order to obtain more precise description of the behaviour of Ni-based superalloys, during controlled heating/cooling of the initial material (as received state) during DTA analyses, all the samples of superalloys were subjected to a phase analysis using scanning electron microscopy. The course of phase transformations, in all the studied superalloys (IN713LC, IN738LC, IN792 5A) is likely to run according to the following reaction scheme (L = melt): L ↔ γ, L ↔ γ + MC, L ↔ γ/γ′, L ↔ γ + minority phases (such as M3B2, phase η), γ ↔ γ′.

Mechanisms Underlying Hardness Numbers

2004 ◽  
Vol 843 ◽  
Author(s):  
John J. Gilman
Keyword(s):  
Shear Modulus ◽  
Physical Properties ◽  
Phase Transformations ◽  
Band Gap ◽  
Chemical Bonding ◽  
Formation Energy ◽  
Conventional Wisdom ◽  
Indentation Hardness ◽  
Ionic Charge ◽  
Empirical Property

ABSTRACTRelationships of indentation hardness numbers to to other physical properties are demonstrated. They differ depending on the type of chemical bonding; metals, alloys ionic, covalent, and metal-metalloid. The properties are: shear modulus; ionic charge; band-gap density; polarizability; and formation energy, respectively. In each case the rationale is provided. The concept of a “bonding Modulus” is introduced. It is concluded that the conventional wisdom that hardness is a purely empirical property does not hold. Phase transformations and indentation hardness are connected broadly.

Structure–phase transformations and physical properties of ferritic–martensitic 12% chromium steels EK-181 and ChS-139

2016 ◽  
Vol 61 (1) ◽  
pp. 97-102 ◽  
Author(s):  
V. M. Chernov ◽  
M. V. Leont’eva-Smirnova ◽  
M. M. Potapenko ◽  
N. A. Polekhina ◽  
I. Yu. Litovchenko ◽  
...  
Keyword(s):  
Physical Properties ◽  
Phase Transformations ◽  
Chromium Steels ◽  
Structure Phase

In situ TEM nanoindentation-induced new nanostructure in cadmium zinc telluride

Nanoscale ◽  
2021 ◽  
Author(s):  
Dongdong Liu ◽  
Zhenyu Zhang ◽  
Leilei Chen ◽  
Dong Wang ◽  
Junfeng Cui ◽  
...  
Keyword(s):  
Phase Transition ◽  
Physical Properties ◽  
Phase Transformations ◽  
Cadmium Zinc Telluride ◽  
Zinc Telluride ◽  
In Situ Tem ◽  
Brittle Solid ◽  
Cadmium Zinc

Phase transformations happened in a solid determine the significantly structural and physical properties. Nevertheless, deformation-induced phase transition in a soft-brittle solid has not been demonstrated yet. Soft-brittle cadmium zinc telluride...

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