Crystallization kinetics of Cu47Zr47Al6 and (Cu47Zr47Al6)99Sn1 bulk metallic glasses

Rashidi, Reza; Malekan, Mehdi; Gholamipour, Reza

doi:10.1016/j.jnoncrysol.2018.06.042

Cited by 28 publications

(4 citation statements)

References 49 publications

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“…Platinum has the greatest impact (it raises T x by approximately 50 K), because it has a higher melting point (1770 • C/2043 K) [21]. The relative crystallized volume at current temperature for each curve was determined using the following equation [22]…”

Section: Resultsmentioning

confidence: 99%

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Non-Isothermal Analysis of the Crystallization Kinetics of Amorphous Mg72Zn27Pt1 and Mg72Zn27Ag1 Alloys

Pierwoła,

Lelito,

Krawiec

et al. 2024

Materials

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In this study, thin ribbons of amorphous Mg72Zn27Pt1 and Mg72Zn27Ag1 alloys with potential use in biomedicine were analyzed in terms of the crystallization mechanism. Non-isothermal annealing in differential scanning calorimetry (DSC) with five heating rates and X-ray diffraction (XRD) during heating were performed. Characteristic temperatures were determined, and the relative crystalline volume fraction was estimated. The activation energies were calculated using the Kissinger method and the Avrami exponent using the Jeziorny–Avrami model. The addition of platinum and silver shifts the onset of crystallization towards higher temperatures, but Pt has a greater impact. In each case, Eg > Ex > Ep (activation energy of the glass transition, the onset of crystallization, and the peak, respectively), which indicates a greater energy barrier during glass transition than crystallization. The highest activation energy was observed for Mg72Zn27Pt1 due to the difference in the size of the atoms of all alloy components. The crystallization in Mg72Zn27Ag1 occurs faster than in Mg72Zn27Pt1, and the alloy with Pt has higher (temporary) thermal stability. The Avrami exponent (n) values oscillate in the range of 1.7–2.6, which can be interpreted as one- and two-dimensional crystal growth with a constant/decreasing nucleation rate during the process. Moreover, the lower the heating rate, the higher the nucleation rate. The values of n for Mg72Zn27Pt1 indicate a greater number of nuclei and grains than for Mg72Zn27Ag1. The XRD tests indicate the presence of α-Mg and Mg12Zn13 for both Mg72Zn27Pt1 and Mg72Zn27Ag1, but the contribution of the Mg12Zn13 phase is greater for Mg72Zn27Ag1

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Section: Resultsmentioning

confidence: 99%

“…Figure 3. DSC curves for the (a) Mg 72 Zn 27 Pt 1 and (b) Mg 72 Zn 27 Ag 1 alloys heated at the rate of 5, 10, 20, 40, and 80 K/min.The relative crystallized volume at current temperature for each curve was determined using the following equation[22] …”

mentioning

confidence: 99%

Non-Isothermal Analysis of the Crystallization Kinetics of Amorphous Mg72Zn27Pt1 and Mg72Zn27Ag1 Alloys

Pierwoła,

Lelito,

Krawiec

et al. 2024

Materials

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“…The beginning and end times of the crystallization process of these glasses depend on the material chemical composition and temperature. Shortening the duration of and the acceleration of the crystallization process can be achieved via isothermal annealing at increased temperatures [31][32][33]. Due to this heat treatment, it is possible to obtain in situ composites in which the matrix constitutes the amorphous phase while reinforcing the crystalline phase.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Crystallization Kinetics and Thermal Stability of the Amorphous Mg72Zn24Ca4 Alloy

et al. 2021

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The aim of this study was to analyze the crystallization of the Mg72Zn24Ca4 metallic glass alloy. The crystallization process of metallic glass Mg72Zn24Ca4 was investigated by means of the differential scanning calorimetry. The glass-forming ability and crystallization are both strongly dependent on the heating rate. The crystallization kinetics, during the isothermal annealing, were modelled by the Johnson–Mehl–Avrami equation. Avrami exponents were from 2.7 to 3.51, which indicates diffusion-controlled grain growth. Local exponents of the Johnson–Mehl–Avrami equation were also calculated. In addition, the Mg phase—being the isothermal crystallization product—was found, and the diagram of the time–temperature phase transformation was developed. This diagram enables the reading of the start and end times of the crystallization process, occurring in amorphous ribbons of the Mg72Zn24Ca4 alloy on the isothermal annealing temperature. The research showed high stability of the amorphous structure of Mg72Zn24Ca4 alloy at human body temperature.

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“…Therefore, amorphous alloys are considered as a promising new family of structural and functional materials [1][2][3][4][5][6][7]. Amorphous Cu-Zr-Al alloys are one of the most attractive amorphous alloys, because of their very high glass forming ability (GFA) and high formability [8][9][10][11][12][13], which makes them especially suitable for the fabrication of micro/nano-sized components [14].…”

Section: Introductionmentioning

confidence: 99%

On the competition between synchronous oxidation and preferential oxidation in Cu-Zr-Al metallic glasses

Jeurgens

Hong

et al. 2020

Corrosion Science

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Crystallization kinetics of Cu47Zr47Al6 and (Cu47Zr47Al6)99Sn1 bulk metallic glasses

Cited by 28 publications

References 49 publications

Non-Isothermal Analysis of the Crystallization Kinetics of Amorphous Mg72Zn27Pt1 and Mg72Zn27Ag1 Alloys

Non-Isothermal Analysis of the Crystallization Kinetics of Amorphous Mg72Zn27Pt1 and Mg72Zn27Ag1 Alloys

Analysis of the Crystallization Kinetics and Thermal Stability of the Amorphous Mg72Zn24Ca4 Alloy

On the competition between synchronous oxidation and preferential oxidation in Cu-Zr-Al metallic glasses

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