Phase Diagram Calculation and Experimental Study on the New Type Mg-Al-Zn-Ca-Sr Alloy in the Mg-Rich Region

2010 ◽  
Vol 650 ◽  
pp. 246-252 ◽  
Author(s):  
Su Qin Luo ◽  
Ai Tao Tang ◽  
Fu Sheng Pan ◽  
Yi Chen ◽  
Zhong Xue Feng
Keyword(s):  
Phase Diagram ◽  
Equilibrium Phase ◽  
Solidification Process ◽  
Secondary Phase ◽  
Calculated Phase Diagram ◽  
Rich Region ◽  
Thermo Calc Software ◽  
Calculation Results ◽  
New Type ◽  
Equilibrium Phases

Calculated phase diagram reveals important phase details for a new type muti-component magnesium alloy. Isothermal sections at 25°C of Mg-Ca-Sr, , Mg-2.74Al-Ca-Sr, Mg-2.74Al-0.79Zn-Ca-Sr system in the Mg-rich region were calculated using CALPHAD method, Thermo-Calc software and Mg-Al-Zn-Ca-Sr quinary database. The equilibrium phase composition in the Mg-rich region was analyzed. The equilibrium phases and solidification process of Mg-2.74Al-0.79Zn-0.68Ca-0.03Sr quinary alloy was calculated. The calculation results were consistent with the experimental results of SEM-EDX analysis and DSC spectrum. The solidification process of Mg-2.74Al-0.79Zn-0.68Ca-0.03Sr quinary alloy is as follow : α-Mg precipitates at 621°C, secondary phase C15-Al2(Ca, Sr) and Gamma-Mg17Al12 precipitate at around 520°C and 160°C in sequence, A4B-(Al4Ca,Al4Sr) may precipitate at around 460°C.

Investigation of the Structure and Distribution of Chemical Elements between the Phases of Hard Alloys of the Cr3C2-Ti System, Obtained at Various Modes of Explosive Compaction

2020 ◽  
Vol 992 ◽  
pp. 487-492
Author(s):  
V.O. Kharlamov ◽  
Aleksandr Vasilevich Krokhalev ◽  
S.V. Kuz’min ◽  
V.I. Lysak
Keyword(s):  
Phase Composition ◽  
Powder Mixture ◽  
Chemical Interaction ◽  
Chemical Elements ◽  
Equilibrium Phase ◽  
Hard Alloys ◽  
Explosive Compaction ◽  
Thermo Calc Software ◽  
Equilibrium Phases ◽  
Explosive Pressing

The Article presents the findings of the studies of the microstructure, chemical and phase composition of the Cr3C2-Ti system alloys obtained by the explosion. Scanning electron microscopy, energy dispersive and x-ray diffraction analyses were used. The program Thermo-Calc software was used to calculate the equilibrium phases. The phase composition of the compact was shown to fully correspond to that of the initial powder mixture during explosive pressing in the modes of heating from 300 ̊С to 600 ̊С. When heated above 600 ̊С, the chemical interaction of the initial components begins with the formation of new boundary phases. Meanwhile, there is a change in the sample destruction nature and a significant increase in hardness, which points to the hard alloy consolidation. The increase in the powder mixture heating in shock waves to 1000 ̊С leads to intensive macrochemical interaction of the powder mixture components and to formation of an equilibrium phase composition. The established temperature limits determine the most appropriate parameters of shock-wave loading when producing hard alloys by explosive pressing.

Key Program for Non-Equilibrium Phase Diagram of Ni 1 Type Steel

2011 ◽  
Vol 204-210 ◽  
pp. 1357-1361 ◽  
Author(s):  
Qing Hua Zou ◽  
Sheng Zhong Zou
Keyword(s):  
Phase Diagram ◽  
Chemical Composition ◽  
Structural Steel ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Air Cooling ◽  
Lever Rule ◽  
Dynamic Phase ◽  
New Type ◽  
Non Equilibrium

The practical air-cooling new-type dynamic phase diagram and nonequilirium lever rule of Ni 1 structural steel was established, and the relevant structure and chemical composition were analyzed, which can be used in practical production. The computer programs for drawing binary non-equilibrium phase diagram of Ni type structural steel have designed.

New-Type Co-Based Superalloys Designed by CALPHAD Method

2015 ◽  
Vol 816 ◽  
pp. 578-580 ◽  
Author(s):  
Shu Yu Yang ◽  
Min Jiang ◽  
Lei Wang
Keyword(s):  
Phase Diagram ◽  
Phase Equilibria ◽  
Phase Diagrams ◽  
Calculated Phase Diagram ◽  
Calphad Method ◽  
Two Phase ◽  
Calculated Phase ◽  
New Type

The phase equilibria of new-type Co-based superalloys which include the system of Co-Al-W were studied by CALPHAD method. It was shown that γ+γ' two-phase regions were existed in the calculated phase diagrams. The compositions of new-type Co-based superalloys which can obtain γ+γ' microstructures were predicted due to the calculated phase diagram. The mole fractions of the constituent phases of Co-Al-W-Ni-Cr alloys were calculated. The temperature of γ' phase began to precipitate at about 1050°C.

Key Drawing Program for the Prior Eutectoid and Eutectoid Zone of Non-Equilibrium Phase Diagram of Carbon Steel

2014 ◽  
Vol 692 ◽  
pp. 439-443
Author(s):  
Qing Hua Zou ◽  
Li Zhu
Keyword(s):  
Phase Diagram ◽  
Carbon Steel ◽  
Computer Calculation ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Chemical Compositions ◽  
Main Computer ◽  
New Type ◽  
Drawing Program ◽  
Non Equilibrium

The new type dynamic phase diagrams and the non-equilibrium lever principle of carbon steel have been established and discussed, the corresponding structures and chemical compositions are analyzed. The computer calculation programming of phase diagram and main computer program have been setted.

Effect of Carbon on the Microstructure of a Cu-Fe Alloy

2018 ◽  
Vol 279 ◽  
pp. 49-54 ◽  
Author(s):  
De Ping Lu ◽  
Wei Guo ◽  
Jiang Jiang ◽  
Lei Lu ◽  
Jin Zou ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Volume Fraction ◽  
Metastable Phase ◽  
Solidification Process ◽  
Secondary Phase ◽  
Liquid Immiscibility ◽  
Average Diameter ◽  
Experimental Results ◽  
Liquid Phases ◽  
Rich Liquid

The effect of C addition on the microstructure of a Cu-Fe alloy was investigated by combining the calculation of phase diagram (calphad) and the experimental research. The calphad results indicated that the addition of C substantially enlarged the zone of liquid immiscibility gap in the metastable phase diagram of Cu-Fe alloy. In addition, the larger the addition content of C was, the more obvious the phenomenon was. As a result, the presence of trace amounts of C in the Cu-Fe alloy containing 5~20% (wt.) Fe would cause the liquid phase separation of Cu-rich and Fe-rich liquid phases during the solidification process of the alloy. The experimental results showed that the dendritic secondary phase in the as-cast microstructure of the Cu-14Fe alloy tended to be spheroidized after the addition of C due to the separation of Cu-rich and Fe-rich liquid phases. With the increasing content of C, the volume fraction and the average diameter of the spherical Fe-rich particles both increased. The calphad conclusions are in agreement with the experimental results.

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.

scholarly journals Prediction of phase equilibria in the In-Sb-Pb system

2008 ◽  
Vol 73 (3) ◽  
pp. 377-384
Author(s):  
Dusko Minic ◽  
Dragan Manasijevic ◽  
Dragana Zivkovic ◽  
Nada Strbac ◽  
Zvonimir Stankovic
Keyword(s):  
Experimental Data ◽  
Phase Diagram ◽  
Phase Equilibria ◽  
Binary Systems ◽  
Equilibrium Phase ◽  
Calculated Phase Diagram ◽  
Equilibrium Phase Diagram ◽  
Thermodynamic Prediction ◽  
Calculated Liquidus ◽  
Good Agreement

Binary thermodynamic data, successfully used for phase diagram calculations of the binary systems In-Sb, Pb-Sb and In-Pb, were used for the prediction of the phase equilibria in the ternary In-Sb-Pb system. The predicted equilibrium phase diagram of the vertical Pb-InSb section was compared with the results of differential thermal analysis (DTA) and optical microscopy. The calculated phase diagram of the isothermal section at 300 ?C was compared with the experimentally (SEM, EDX) determined composition of phases in the chosen alloys after annealing. Very good agreement between the binary-based thermodynamic prediction and the experimental data was found in all cases. The calculated liquidus projection of the ternary In-Sb-Pb system is also presented.

Crack Healing Behavior of 12%Cr Ultra-Super-Critical Rotor Steel

2010 ◽  
Vol 152-153 ◽  
pp. 248-253 ◽  
Author(s):  
Yan Li ◽  
Jing Tao Han ◽  
Yong Jun Zhang
Keyword(s):  
Phase Diagram ◽  
Grain Growth ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Positive Influence ◽  
Rotor Steel ◽  
Crack Healing ◽  
Compression Method ◽  
Thermo Calc Software ◽  
Different Temperatures

A drilling and compression method was designed to produce samples with artifical inner crack. According to the morphology, two types of crack were defined. After heating and holding at different temperatures, the crack healing results were observed under SEM. The starting temperature of crack healing is between 900°C and 950°C. Pseudo-equilibrium phase diagram of 12%Cr was calculated by the Thermo-Calc software to investigate the influence of transformation on the crack healing. It is found that the diffusive transformation has a positive influence on the crack healing behavior. Through experimental results and analysis, we conclude that crack healing is a physical process in association with diffusion, nucleation and grain growth. Any factor which can accelerate diffusion, nucleation and grain growth rate is favorable for the crack healing.

Equilibrium phases of one-patch colloids with short-range attractions

Soft Matter ◽  
2014 ◽  
Vol 10 (28) ◽  
pp. 5121-5128 ◽  
Author(s):  
Zdeněk Preisler ◽  
Teun Vissers ◽  
Gianmarco Munaò ◽  
Frank Smallenburg ◽  
Francesco Sciortino
Keyword(s):  
Phase Diagram ◽  
Crystal Structures ◽  
Computer Simulations ◽  
Short Range ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Equilibrium Phases

We investigate particles with one attractive patch (blue) interacting with a Kern–Frenkel potential in computer simulations. In particular, we study the effect of the patch coverage on the possible crystal structures and the equilibrium phase diagram.

Phase Diagram of Mg-Zn-Gd System Alloy at Mg Rich Corner and its Application in the Development of Two New Alloys

2013 ◽  
Vol 765 ◽  
pp. 3-7 ◽  
Author(s):  
Yong Chun Guo ◽  
Jian Ping Li ◽  
Jin Shan Li ◽  
Zhong Yang ◽  
Ping Wang
Keyword(s):  
Phase Diagram ◽  
Phase Diagrams ◽  
Equilibrium Phase ◽  
Calculated Phase Diagram ◽  
Equilibrium Phase Diagram ◽  
Isothermal Sections ◽  
Calculated Phase ◽  
Treatment Processes ◽  
Zn Content ◽  
Calculation Software

The Mg-rich corner of the equilibrium phase diagram of the Mg-Zn-Gd system has been calculated in detail using the phase diagram calculation software PANDAT and the thermodynamic database for Mg alloys. The calculated phase diagram includes the liquidus projection, isothermal sections and vertical sections. It is found that an increase of Zn content in the Mg-Gd alloy reduces the phase field of α-Mg + GdMg5. Based on the calculated phase diagrams, two alloys, Mg-5.5Zn-2Gd-0.5Zr and Mg-1.6Gd-5.5Zn-0.5Zr (wt.%), denoted as ZGK620 and ZGK616, were developed and their solidification and precipitation processes were analyzed in detail. The optimized thermal mechanical processing and heat-treatment processes were defined by referring to the calculated phase diagrams of the Mg-Zn-Gd system.

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