Non-isothermal and isothermal crystallization kinetics and their effect on microstructure of sintered and crystallized TiNbZrTaSi bulk alloys

Li, Y.H.; Chao, Yang; Kang, L.M.; Zhao, Haidong; Qu, Shengguan; Li, X.Q.; Zhang, W.W.

doi:10.1016/j.jnoncrysol.2015.11.005

Cited by 45 publications

(19 citation statements)

References 37 publications

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“…This phenomenon suggests that the atoms have faster mobility at higher annealing temperature, which will promote that the amorphous state translates to a crystalline state. The results are in good agreement with the previous reports, such as Zr‐based bulk metallic glasses, Ti‐based bulk alloy, and Ni‐based amorphous alloy …”

Section: Resultssupporting

confidence: 92%

Kinetics analysis of the isothermal crystallization of Cu₅₅Zr₄₅ metallic glass by differential scanning calorimetry

Gao

Jian

2019

Int J of Chemical Kinetics

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The crystallization kinetics of Cu55Zr45 (at%) glassy alloy is studied under isothermal condition using differential scanning calorimetry (DSC). The plot of correlation between the crystallized volume fraction α and annealing time t shows a sigmoid‐type curve, which is steeper with higher annealing temperature. Furthermore, in isothermal crystallization condition, local activation energy Eα values, determined using the Arrhenius equation, range from 181.1 to 187.8 kJ/mol, which is nearly a constant. The local Avrami exponent n(α) values, obtained by the Johnson‐Mehl‐Avrami equation, which range from 2.2 to 4.0 at different annealing temeperatures, which indicates that the crystallization mechanism is diffusion‐controlled transformation. Moreover, n(α) becomes greater with increasing annealing temperature, which indicates that annealing temperature can affect nucleation rate and growth type.

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Section: Resultssupporting

confidence: 92%

Kinetics analysis of the isothermal crystallization of Cu₅₅Zr₄₅ metallic glass by differential scanning calorimetry

Gao

Jian

2019

Int J of Chemical Kinetics

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“…The manufacture of nearly full dense BMG or nano/ultra fine‐grained alloys is possible by using amorphous titanium alloy powder prepared by mechanical alloying and consolidated by SPS . Amorphization of titanium alloys is achieved by the addition of specific elements and further improving sintering . The mechanism of enhancing sintering is attributed to a wide supercooled liquid region or decreased activation energy of viscous flow .…”

Section: Challenges For Pm Titaniummentioning

confidence: 99%

“…The microstructure of sintered and crystallized titanium amorphous powders can be tailored and optimized by controlling the crystallization kinetics, the nucleation and growth crystallization mechanism, and the nucleation and growth rate of grains of amorphous alloy powder . These alloys exhibit ultrafine and equiaxed grained composite microstructure and excellent combination of high strength and large plasticity, or high strength and low elastic modulus and excellent tribological behavior …”

Section: Challenges For Pm Titaniummentioning

confidence: 99%

Powder Metallurgy Strategies to Improve Properties and Processing of Titanium Alloys: A Review

et al. 2017

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Powder metallurgy (PM) is an attractive technology for manufacturing net-shape titanium-based components. However, it is challenging to make PM titanium products competitive in terms of mechanical properties. This article gives an overview of the current challenges in PM titanium and the best strategies to overcome them by alloying. By adding suitable alloying elements the properties of PM titanium components can be enhanced. The use of sintering aids helps to control the typical residual porosity of PM titanium alloys. Furthermore, controlling microstructure by alloying offers the possibility to go for high performance applications. Moreover, ductility is improved by adding elements that scavenge oxygen. A favorable selection of alloying elements offers a practical and competitive approach to meet the mechanical requirements in future PM titanium applications.

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“…Crystallization mechanism. In order to establish the mechanism of isothermal crystallization in the spark plasma sintered iron based metallic glass, the results obtained from the in-situ small angle neutron scattering analysis of the distribution of volume fraction of (Fe,Cr) 23 C 6 crystals were modeled by the Johnson-Mehl-Avrami equation, expressed as 55,56 :…”

Section: Isothermal Crystallization Kineticsmentioning

confidence: 99%

Crystallization Mechanism in Spark Plasma Sintered Bulk Metallic Glass Analyzed using Small Angle Neutron Scattering

Paul

Singh

Littrell

et al. 2020

Sci Rep

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Understanding the thermal stability of metallic glasses is critical to determining their safe temperatures of service. In this paper, the crystallization mechanism in spark plasma sintered Fe 48 cr 15 Mo 14 Y 2 c 15 B 6 metallic glass is established by analyzing the crystal size distribution using x-ray diffraction, transmission electron microscopy and in-situ small angle neutron scattering. Isothermal annealing at 700 °C and 725 °C for 100 min resulted in the formation of (Fe,Cr) 23 c 6 crystals, measured from transmission electron micrographs, to be from 10 to 30 nm. The small angle neutron scattering intensity measured in-situ, over a Q-range of 0.02 to 0.3 Å −1 , during isothermal annealing of the sintered samples, confirmed the presence of (Fe,Cr) 23 c 6 crystals. The measured scattering intensity, fitted by the maximum entropy model, over the Q-range of 0.02 to 0.06 Å −1 , revealed that the crystals had radii ranging from 3 to 18 nm. The total volume fraction of crystals were estimated to be 0.13 and 0.22 upon isothermal annealing at 700 °C and 725 °C for 100 min respectively. The mechanism of crystallization in this spark plasma sintered iron based metallic glass was established to be from pre-existing nuclei as confirmed by Avrami exponents of 0.25 ± 0.01 and 0.39 ± 0.01 at the aforesaid temperatures.

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Non-isothermal and isothermal crystallization kinetics and their effect on microstructure of sintered and crystallized TiNbZrTaSi bulk alloys

Cited by 45 publications

References 37 publications

Kinetics analysis of the isothermal crystallization of Cu₅₅Zr₄₅ metallic glass by differential scanning calorimetry

Kinetics analysis of the isothermal crystallization of Cu₅₅Zr₄₅ metallic glass by differential scanning calorimetry

Powder Metallurgy Strategies to Improve Properties and Processing of Titanium Alloys: A Review

Crystallization Mechanism in Spark Plasma Sintered Bulk Metallic Glass Analyzed using Small Angle Neutron Scattering

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Non-isothermal and isothermal crystallization kinetics and their effect on microstructure of sintered and crystallized TiNbZrTaSi bulk alloys

Cited by 45 publications

References 37 publications

Kinetics analysis of the isothermal crystallization of Cu55Zr45 metallic glass by differential scanning calorimetry

Kinetics analysis of the isothermal crystallization of Cu55Zr45 metallic glass by differential scanning calorimetry

Powder Metallurgy Strategies to Improve Properties and Processing of Titanium Alloys: A Review

Crystallization Mechanism in Spark Plasma Sintered Bulk Metallic Glass Analyzed using Small Angle Neutron Scattering

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Kinetics analysis of the isothermal crystallization of Cu₅₅Zr₄₅ metallic glass by differential scanning calorimetry

Kinetics analysis of the isothermal crystallization of Cu₅₅Zr₄₅ metallic glass by differential scanning calorimetry