Calculation of property contour diagrams

Chen, Shuanglin; Cao, Wei; Zhang, Chuan; Zhu, Jun; Zhang, Fan; Li, Qian; Zhang, Jieyu

doi:10.1016/j.calphad.2016.05.004

Cited by 15 publications

(3 citation statements)

References 5 publications

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“…work the mechanisms listed below will be referred to as types 1, 2, and 3: Type 1: the homogeneous critical-end-point mechanism Type 2: the heterogeneous double-critical-point mechanism Type 3: the homogeneous triple-critical-point mechanism In the previous work, [9] the mechanisms by which 3-phase miscibility gaps could form were studied using Pandat computer simulations [26] with regular and sub-regular solution models. The publication validated the phase diagram sketches by Schreinemakers and expanded on the hand calculated diagrams given by Meijering.…”

Section: Gibbs and Korteweg Contributionsmentioning

confidence: 99%

“…Many different types of diagrams have been calculated and most of them were calculated directly using Pandat software. [26] For the calculation of diagrams with spinodal, eigenvalues, eigenvectors, and the third derivative of Gibbs energy, these properties must first be defined as thermodynamic properties of phases. The diagrams were calculated using the contour property diagram utility of Pandat.…”

Section: Polythermal Projections and Characteristic Linesmentioning

confidence: 99%

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Stability of High Entropy Alloys to Spinodal Decomposition

Morral

Chen

2021

J. Phase Equilib. Diffus.

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When a high entropy alloy (HEA) system contains a single binary miscibility gap, the gap spreads across the entire composition space of the system. Beneath the miscibility gap is a spinodal hypersurface above which HEAs are stable to a continuous change of phase via spinodal decomposition. When there are additional binary miscibility gaps, the stability limits appear separately at high temperature but combine on cooling to form a continuous surface that may contain a cone point, an important feature for the design of age hardening alloys. In this work, an understanding of how spinodal surfaces form, combine, and develop critical features is obtained by investigating several ternary systems each with three binary miscibility gaps. Because their topology is the same, bisection isopleths and isothermal sections of ternary phase diagrams given in this work will help interpret calculated bisection isopleths and isotherms of 5-and 6-dimensional HEA phase diagrams.

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Section: Gibbs and Korteweg Contributionsmentioning

confidence: 99%

Section: Polythermal Projections and Characteristic Linesmentioning

confidence: 99%

Stability of High Entropy Alloys to Spinodal Decomposition

Morral

Chen

2021

J. Phase Equilib. Diffus.

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“…What is more, the thermodynamic information is very important for the effective alloy design as well as the prediction of the distribution of impurities in alloys. [ 27–29 ] However, there is little thermodynamic information on the dilute part of the phase diagram. The currently measured content of Fe, Ni, Cr in liquids is also valuable experimental data for the revision of current thermodynamic database.…”

Section: Introductionmentioning

confidence: 99%

Effect of Steels on the Purity of Molten Mg Alloys

et al. 2020

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Magnesium (Mg) alloys have received extensive attention in industrial applications due to their low density, low modulus of elasticity, high-specific strength, and high-specific stiffness. [1-4] However, the low-temperature formability [5] and low corrosion resistance [6-8] of Mg alloys limit their large-scale applications. Many researches have indicated that the impurity elements, Fe, Ni, Cu, Co, in Mg alloys can strongly increase their corrosion rate, [9-11] and also severely deteriorate the mechanical [12-14] and damping properties. [15] When the impurities content in alloys exceeds the "tolerance limit" (10 ppm magnitude), the corrosion rate of Mg alloys will be exponentially accelerated. [16] Therefore, it is of great significance to strictly control the purity of the Mg alloys, especially the purity of the molten alloys before casting. Unfortunately, it is almost impossible to completely avoid these impurities during the production of Mg alloys. First, during Mg-metal smelting, no matter whether the Pidgeon method or the electrolytic magnesium method is used, there are always some impurities picked up from the raw materials. Second, these elements existing in the steel tools and steel crucibles can be dissolved in the molten Mg alloys during the melting process. [17-20] The purification of the molten Mg and Mg alloys has been studied extensively. [21-24] However, the effect resulting from defined tools on the Mg alloys production is rarely studied. [19,25] Scharf and Ditze [19] studied the interaction layers between AZ91 and AS31 with steel crucibles. The dissolution of iron, lowcarbon steel, and SUS316 (11wt% Ni, 17wt% Cr, remainder Fe) crucibles in commercial pure molten Mg was investigated by Taninouchi et al. [25] However, the influence of the types of used steels on the purity of molten Mg alloys has not been studied. Only by understanding the specific impact of elements coming from the tooling materials on the purity of molten Mg alloys can assure the purity of Mg alloys. This work aims to quantitatively determine the effect of tooling materials on the purity of Mg alloys melt. The most commonly cast Mg alloys, AZ91D, and AM50A, were studied. Three types of common tooling materials used in the production of Mg alloys: 20# steel, H13 steel, High-CrNi (022Cr25Ni7Mo4N) steel, were studied. Low carbon steel (here 20#) is the most common material used as the crucible materials for the Mg alloys synthesis. H13 steel is commonly used for Mg alloys casting molds. High-CrNi heat-resistant steel is commonly seen for the reduction tank in the Pidgeon process. The interactions between these tooling materials and Mg alloys were pre-evaluated using the Thermo-Calc 2019 software [26] based on the TCMG5 thermodynamic database. The influence of tooling materials on the purity of molten Mg alloys was experimentally studied using the liquid-solid diffusion method. What is more, the thermodynamic information is very important for the effective alloy design as well as the prediction of the distribution of impurities in al...

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