Kinetics of the Wurtzite-to-Rock-Salt Phase Transformation in ZnO at High Pressure

2011 ◽  
Vol 115 (17) ◽  
pp. 4354-4358 ◽  
Author(s):  
Vladimir L. Solozhenko ◽  
Oleksandr O. Kurakevych ◽  
Petr S. Sokolov ◽  
Andrey N. Baranov
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Rock Salt ◽  
Salt Phase ◽  
Kinetics Of

scholarly journals Quench Sensitivity and Phase Transformation Kinetics of AlSi7MnMg High Pressure Vacuum Die Casting

2020 ◽  
Vol 326 ◽  
pp. 02001
Author(s):  
Mengyun Liu ◽  
Zhan Zhang ◽  
Francis Breton ◽  
X.-Grant Chen
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Mechanical Strength ◽  
Isothermal Treatment ◽  
Transformation Rate ◽  
Temperature Property ◽  
Quench Sensitivity ◽  
Transformation Diagrams ◽  
Nose Temperature ◽  
Kinetics Of

The quench sensitivity of an AlSi7MnMg alloy in high-pressure vacuum die (HPVD) casting was investigated by time-temperature-transformation and time-temperature-property diagrams with an interrupted quench technique. The quench sensitive temperature range of the alloy is from 260 to 430 °C and its nose temperature is 350 °C. The mechanical strength versus cooling rates of the HPVD casting was predicted using quench factor analysis method and verified by experimental results. The critical cooling rate is 6 °C/s to remain 95% of the maximal mechanical strength. The coefficients k2 - k5, related to the nucleation and precipitation kinetics of TTP curves, and phase transformation diagrams were determined. The precipitation of Mg2Si phase in the castings was observed during isothermal treatment using transmission electron microscope. Moreover, the quench sensitivity and kinetics of the phase transformation of AlSi7MnMg alloy and AlSi10MnMg alloys were compared. It reveals that the quench sensitivity and phase transformation rate of the former are lower than that of the latter.

Phase Transformation Kinetics of Austenite during a Combination of Laser-Hybrid and Multi-Arc Welding of High Pressure Pipes

2020 ◽  
Vol 121 (10) ◽  
pp. 996-1001
Author(s):  
L. A. Efimenko ◽  
O. E. Kapustin ◽  
D. V. Ponomarenko ◽  
I. Yu. Utkin ◽  
A. I. Romantsov ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Arc Welding ◽  
Transformation Kinetics ◽  
Phase Transformation Kinetics ◽  
Pressure Pipes ◽  
Laser Hybrid ◽  
Kinetics Of

Phase transformation kinetics of ω-phase in pure Ti formed by high-pressure torsion

2015 ◽  
Vol 51 (5) ◽  
pp. 2608-2615 ◽  
Author(s):  
Nozomu Adachi ◽  
Yoshikazu Todaka ◽  
Kenshu Irie ◽  
Minoru Umemoto
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
High Pressure Torsion ◽  
Transformation Kinetics ◽  
Ω Phase ◽  
Phase Transformation Kinetics ◽  
Kinetics Of

High pressure structural phase transition and elastic properties of ZnSexTe1−x semiconducting compounds

2019 ◽  
Vol 33 (22) ◽  
pp. 1950250
Author(s):  
Saligram Verma ◽  
Arvind Jain ◽  
K. K. Choudhary ◽  
Netram Kaurav
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Phase Diagram ◽  
High Pressure ◽  
Phase Transformation ◽  
Structural Phase Transition ◽  
Rock Salt ◽  
Structural Phase ◽  
Volume Phase ◽  
Zinc Blende

This paper discusses the high pressure-dependent crystal structure phase transformation and elastic behavior of ZnSe[Formula: see text]Te[Formula: see text] (x = 0.0, 0.2, 0.55, 0.81, 0.93 and 1.0) by speculating effective interionic interaction potential (EIoIP), that contains long-range type Coulomb force, short-range overlap repulsion of the Hafemeister and Flygare types and the van der Waals (vdW) interaction. The assessed values of structural phase transition pressure and the considerable volume discontinuity associated with the pressure–volume phase diagram support the structural phase transformation from zinc blende (B3) type to rock-salt (B1) type crystal structure. The equation of state curves (relationship between V(p)/V(0) and pressure in the pressure–volume phase diagram) for both the zinc blende (B3) and rock-salt (B1) structures is in reasonably good agreement with that of experimental observations. Moreover, systematic variations of the second-order elastic constants (SOEC) with pressure have been found to follow systematic trends showed by the other systems with B3 type to B1 type pressure-dependent structural phase transition.

Elastic properties of the high-pressure rock-salt phase of ZnO

2008 ◽  
Vol 88 (3) ◽  
pp. 181-190 ◽  
Author(s):  
H. Wu ◽  
X. Cheng ◽  
H. Zhang ◽  
Z. Liu
Keyword(s):  
High Pressure ◽  
Elastic Properties ◽  
Rock Salt ◽  
Salt Phase

scholarly journals Continuous Cooling Transformation Behaviour and Bainite Transformation Kinetics of 23CrNi3Mo Carburised Steel

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 48
Author(s):  
Wenjun Song ◽  
Min Lei ◽  
Mingpan Wan ◽  
Chaowen Huang
Keyword(s):  
Phase Transformation ◽  
Volume Fraction ◽  
Austenite Formation ◽  
Steel Matrix ◽  
Transformation Kinetics ◽  
Bainite Transformation ◽  
Continuous Cooling ◽  
The Matrix ◽  
Dimensional Growth ◽  
Kinetics Of

In this study, the phase transformation behaviour of the carburised layer and the matrix of 23CrNi3Mo steel was comparatively investigated by constructing continuous cooling transformation (CCT) diagram, determining the volume fraction of retained austenite (RA) and plotting dilatometric curves. The results indicated that Austenite formation start temperature (Ac1) and Austenite formation finish temperature (Ac3) of the carburised layer decreased compared to the matrix, and the critical cooling rate (0.05 °C/s) of martensite transformation is significantly lower than that (0.8 °C/s) of the matrix. The main products of phase transformation in both the carburised layer and the matrix were martensite and bainite microstructures. Moreover, an increase in carbon content resulted in the formation of lamellar martensite in the carburised layer, whereas the martensite in the matrix was still lath. Furthermore, the volume fraction of RA in the carburised layer was higher than that in the matrix. Moreover, the bainite transformation kinetics of the 23CrNi3Mo steel matrix during the continuous cooling process indicated that the mian mechanism of bainite transformation of the 23CrNi3Mo steel matrix is two-dimensional growth and one-dimensional growth.

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