Thermal stability of the Al70Ni10Ti10Zr5Ta5 amorphous alloy powder fabricated by mechanical alloying

Wei, Xiaoran; Wang, Xinfu; Han, Fuzhu; Xie, Haibo; Wen, Cuie

doi:10.1016/j.jallcom.2010.02.003

Cited by 16 publications

(12 citation statements)

References 40 publications

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“…To investigate the reaction dynamics during thermal treatment, the Kissinger and Ozawa methods were adopted to calculate the activation energy of the reaction . Their corresponding equations are presented below:

Kissinger equation : ln (\frac{β_{i}}{T_{pi}^{2}}) = ln \frac{A_{k} R}{E_{k}} - \frac{E_{k} 1}{R T_{pi}}, i = 1, 2, 3, 4 \dots;

Ozawa equation: log β = log (\frac{italicAE}{R G ()(, a)}) - 2.315 - 0.4567 \frac{E}{RT}

where β i refers to the heating rate, T pi is the peak temperature of the maximal mass‐loss rate, R is the gas constant, while the model parameters A k and E k refer to the frequency factor and activation energy, respectively, and G ( a ) is the integral equation of the reaction.…”

Section: Resultsmentioning

confidence: 99%

Microstructural evolution and kinetics analysis of aluminum borate ceramics via solid‐state reaction synthesis

Luo

Xiang

et al. 2019

Int J Applied Ceramic Tech

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Aluminum borate ceramics (ABCs) with a skeleton structure of rod-like crystals were established via a solid-state reaction synthesis. The influence of heat treatment systems on the phase composition and microstructural evolution of an anisotropic grain were firstly studied. Next, the impact of boric acid content on the activation energy of reaction, microstructure, mechanical properties, and neutron shielding

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Kissinger equation : ln (\frac{β_{i}}{T_{pi}^{2}}) = ln \frac{A_{k} R}{E_{k}} - \frac{E_{k} 1}{R T_{pi}}, i = 1, 2, 3, 4 \dots;

Ozawa equation: log β = log (\frac{italicAE}{R G ()(, a)}) - 2.315 - 0.4567 \frac{E}{RT}

Section: Resultsmentioning

confidence: 99%

Microstructural evolution and kinetics analysis of aluminum borate ceramics via solid‐state reaction synthesis

Luo

Xiang

et al. 2019

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

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“…However, the crystallization temperature and the range of supercooled liquid region vary with the change in heating rate, so they cannot be used to describe the crystallization process of amorphous alloys. The CHT curve can be used to describe the crystallization of amorphous alloys [25][26][27]. However, the measurement of the CHT curve takes a long time, so it is necessary to find a simple way to fit the CHT curve.…”

Section: Cht Curve Fittingmentioning

confidence: 99%

Crystallization of Zr-Based Amorphous Alloys in Laser Welding

Yan¹,

Song²,

Huang³

et al. 2023

Preprint

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Crystallization often occurs in the laser welding of amorphous alloys, reducing the amorphous alloys’ properties. So, it is necessary to simulate the temperature field curve of the welding area by computer and then determine the power and laser moving speed of laser welding. In this paper, the temperature field curve of Zr41.2Ti13.8Cu12.5Ni10Be22.5(Vit1) amorphous alloy in laser welding is obtained by finite element analysis. The continuous heating curve (CHT) of Vit1 is fitted by the Vogel-Fulcher-Tammann (VFT) equation and the Kissinger equation. If the temperature field curve intersects with the CHT curve, crystallization occurs. The experiment results show that the VFT equation can be used to predict the crystallization of Vit1 better in laser welding. The tem-perature and welding time are increased by using low welding speed. Therefore, the temperature of the weld zone cannot fall in time, resulting intersection of the temperature field curve and the CHT curve. So, crystallization can be avoided if the welding speed is controlled within a rea-sonable range, and the highest temperature is kept under the CHT curve.

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“…However, the crystallization temperature and the range of the supercooled liquid region vary with the change in heating rate, so they cannot be used to describe the crystallization process of amorphous alloys. The CHT curve can be used to describe the crystallization of amorphous alloys [27][28][29]. However, the measurement of the CHT curve takes a long time, so it is necessary to find a simple way to fit the CHT curve.…”

Section: Cht Curve Fittingmentioning

confidence: 99%

“…It was found that the fitted CHT curve was in good agreement with the experimental data. The dependence of T on heating rate α is described by [28] ln…”

Section: Cht Curve Fittingmentioning

confidence: 99%

Crystallization of Zr-Based Amorphous Alloys in Laser Welding

Yan

Song

Huang

et al. 2023

Metals

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Crystallization often occurs in the laser welding of amorphous alloys, reducing the properties of amorphous alloys. Therefore, the research in this thesis focuses on the experimental selection of suitable welding parameters to prevent crystallization of Zr-based amorphous alloys during the laser welding process. As such, it is necessary to simulate the temperature field curve of the welding area by computer and then determine the power and laser moving speed of laser welding. In this paper, the temperature field curve of the Zr41.2Ti13.8Cu12.5Ni10Be22.5 (Vit1) amorphous alloy in laser welding is obtained by finite element analysis. The continuous heating curve (CHT) of Vit1 is fitted by the Vogel–Fulcher–Tammann (VFT) equation and the Kissinger equation. If the temperature field curve intersects with the CHT curve, crystallization occurs. The experiment results show that the VFT equation can be used to predict the crystallization of Vit1 better in laser welding. The temperature and welding time are increased by using a low welding speed. Therefore, the temperature of the weld zone cannot fall in time, resulting in the intersection of the temperature field curve and the CHT curve. Thus, crystallization can be avoided if the welding speed is controlled within a reasonable range, and the highest temperature is kept under the CHT curve. The combination of the CHT curve and the temperature field curve shows that the samples at 300 W-3 mm/s and 300 W-6 mm/s welding parameters all undergo crystallization, while the samples at 300 W-9 mm/s and 300 W-12 mm/s welding parameters do not undergo crystallization. Through the flexural test, it is found that the flexural strength of the welded interface is at its the maximum under 300 W-9 mm/s.

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Thermal stability of the Al70Ni10Ti10Zr5Ta5 amorphous alloy powder fabricated by mechanical alloying

Cited by 16 publications

References 40 publications

Microstructural evolution and kinetics analysis of aluminum borate ceramics via solid‐state reaction synthesis

Microstructural evolution and kinetics analysis of aluminum borate ceramics via solid‐state reaction synthesis

Crystallization of Zr-Based Amorphous Alloys in Laser Welding

Crystallization of Zr-Based Amorphous Alloys in Laser Welding

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