Thermodynamic description of the Cu–Ag–Zr system

He, Xiancong; Wang, H.; Liu, H.S.; Jin, Zhanpeng

doi:10.1016/j.calphad.2006.09.001

Cited by 65 publications

(40 citation statements)

References 34 publications

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“…There has been only one reported result of Monte Carlo (MC) simulations performed by the modified embedded atom type (MEAM) potentials [11]. It has been shown that, the MEAM potential reproduced the occurrence of the phase separation of Ag rich phases in supercooled Cu-Zr-Ag liquid alloy that is in a good agreement with experimental data [4] and CALPHADtype thermodynamic calculation [12].…”

Section: Introductionsupporting

confidence: 53%

“…In this study we have used a quantum mechanics based TB potential [12] to describe the atomic motions and to explain the structural properties. In TB approach, the total potential energy of a system is given the following form :…”

Section: Methodsmentioning

confidence: 99%

“…Thus the miscibility gap of the liquid phase that was not considered in the calculations of He et al [12] has been re-optimized by Kang and Jung [13].…”

Section: Introductionmentioning

confidence: 99%

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Liquid -to-glass transition in bulk glass-forming Cu_55-xZr₄₅Ag_xalloys using molecular dynamic simulations

Dalgic

Celtek

2011

EPJ Web of Conferences

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Abstract. We report results from molecular dynamics (MD) studies concerning the microscopic structure of the ternary, bulk metallic glass-forming Cu 55-x Zr 45 Ag x (x=0,10,20) alloys using tight-binding potentials. Understanding of the nature of Glass Forming Ability (GFA) of studied alloys, GFA parameters, glass transition temperature (T-g), melting temperature (T-m), reduced glass transition temperature (T-g/T-m), the supercooled liquid region and other parameters were simulated and compared with experiments. The computed pair distribution functions reproduce well experimental x-ray data of Inoue and co-workers. Structure analysis of the Cu-Zr-Ag alloy based on MD simulation will be also presented.

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Section: Introductionsupporting

confidence: 53%

Section: Methodsmentioning

confidence: 99%

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Liquid -to-glass transition in bulk glass-forming Cu_55-xZr₄₅Ag_xalloys using molecular dynamic simulations

Dalgic

Celtek

2011

EPJ Web of Conferences

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“…Copper-zirconium based bulk metallic glasses (BMGs) have attracted much interest since the discovery of metallic glasses because of their potential advantages as engineering materials, including high tensile strength [1][2][3][4][5]. The ternary Cu-Zr-Ag [6][7][8][9][10][11] and Cu-Zr-Al [12][13][14][15][16] and quaternary Cu-Zr-Ag-Al [17][18][19][20][21] systems have been recently studied regarding the bulk glass forming ability (BGFA); however, only a few studies have been focused on crystallization products that may occur during solidification in the Cu-Zr-Ag alloy system.…”

Section: Introductionmentioning

confidence: 99%

Solidification processes in Cu–Zr–Ag amorphisable alloy system

Janovszky

Sycheva

Tomolya

et al. 2014

Journal of Alloys and Compounds

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Abstract:The Cu-Zr-Ag system is one of Cu-Zr based bulk metallic glasses (BMG) that has been in the center of great interest for a long time. This work summarizes results on solidification in the Cu-Zr-Ag ternary alloys and relationship between the cooling rate and their microstructure. The alloys in a wide range of compositions were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC) techniques. The surface of stable liquidus miscibility gap has been presented by isothermal sections in this system. The central part of liquidus projection of the ternary Cu-Zr-Ag system is determined based on the harmonization of experimental results and the calculated phase diagrams. Due to the liquid separation, amorphous/crystalline composites could be obtained with a silver content up to 50 at%. The primary solidified phases were identified in different samples cooled with a controlled cooling rate (5 K/min), in the arc melting furnace (master alloys) and in a wedge shape mould. It has been shown that the m-phase (or AgCu 4 Zr) has the lowest and the (CuAg) 10 Zr 7 the highest driving force for nucleation in this system. It has been shown that the glass forming ability depends not only on the properties of atomic constituent but on the phases formed during the solidification of undercooled liquid.

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“…Copper and zirconium do not have as high a solid solubility as do Cu and Ni; rather, these elements form many intermediate phases, as shown in their binary phase diagrams (Arias, 1990;He, 2006;Okamoto, 2008). For over 20 years, it has been known that Cu and Zr together have an excellent glass forming ability, proven by different methods of fabrication (Chen, 1993;Brunelli, 2001;Du, 2014;Ristic, 2015).…”

Section: Copper and Zirconium Milling Mechanical Alloyingmentioning

confidence: 99%

Characterization of phase changes during fabrication of copper alloys, crystalline and non-crystalline, prepared by mechanical alloying

Rojas¹,

Martínez²,

Aguilar³

et al. 2016

ing.inv.

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The manufacture of alloys in solid state has many differences with the conventional melting (casting) process. In the case of high energy milling or mechanical alloying, phase transformations of the raw materials are promoted by a large amount of energy that is introduced by impact with the grinding medium; there is no melting, but the microstructural changes go from microstructural refinement to amorphization in solid state. This work studies the behavior of pure metals (Cu and Ni), and different binary alloys (Cu-Ni and Cu-Zr), under the same milling/mechanical alloying conditions. After high-energy milling, X ray diffraction (XRD) patterns were analyzed to determine changes in the lattice parameter and find both microstrain and crystallite sizes, which were first calculated using the Williamson-Hall (W-H) method and then compared with the transmission electron microscope (TEM) images. Calculations showed a relatively appropriate approach to observations with TEM; however, in general, TEM observations detect heterogeneities, which are not considered for the W-H method. As for results, in the set of pure metals, we show that pure nickel undergoes more microstrain deformations, and is more abrasive than copper (and copper alloys). In binary systems, there was a complete solid solution in the Cu-Ni system and a glass-forming ability for the Cu-Zr, as a function of the Zr content. Mathematical methods cannot be applied when the systems have amorphization because there are no equations representing this process during milling. A general conclusion suggests that, under the same milling conditions, results are very different due to the significant impact of the composition: nickel easily forms a solid solution, while with a higher zirconium content there is a higher degree of glassforming ability.

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Thermodynamic description of the Cu–Ag–Zr system

Cited by 65 publications

References 34 publications

Liquid -to-glass transition in bulk glass-forming Cu_55-xZr₄₅Ag_xalloys using molecular dynamic simulations

Liquid -to-glass transition in bulk glass-forming Cu_55-xZr₄₅Ag_xalloys using molecular dynamic simulations

Solidification processes in Cu–Zr–Ag amorphisable alloy system

Characterization of phase changes during fabrication of copper alloys, crystalline and non-crystalline, prepared by mechanical alloying

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Thermodynamic description of the Cu–Ag–Zr system

Cited by 65 publications

References 34 publications

Liquid -to-glass transition in bulk glass-forming Cu55-xZr45Agxalloys using molecular dynamic simulations

Liquid -to-glass transition in bulk glass-forming Cu55-xZr45Agxalloys using molecular dynamic simulations

Solidification processes in Cu–Zr–Ag amorphisable alloy system

Characterization of phase changes during fabrication of copper alloys, crystalline and non-crystalline, prepared by mechanical alloying

Contact Info

Product

Resources

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Liquid -to-glass transition in bulk glass-forming Cu_55-xZr₄₅Ag_xalloys using molecular dynamic simulations

Liquid -to-glass transition in bulk glass-forming Cu_55-xZr₄₅Ag_xalloys using molecular dynamic simulations