Effective role of minor silicon addition on crystallization kinetics of Cu50Zr43Al7 bulk metallic glass

Malekan, Mehdi; Rashidi, Reza

doi:10.1007/s00339-021-04394-z

Cited by 9 publications

(3 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1d. The obtained values (E a,x1 = 325 kJ mol −1 , E a,x2 = 210 kJ mol −1 ) are significantly high, in accordance with literature data on Cu-Zr-Al glasses with slightly different composition [43]. These values confirm the high thermal stability of the glass and suggest that the crystallization takes place through a nucleation and growth process [51].…”

Section: Linear Heating Experimentssupporting

confidence: 89%

“…The original ingot was produced in the same furnace by arc melting the high-purity components (> 99.9) and then the master alloy was flipped and remelted several times. The negative mixing enthalpy between any two components (ΔH mix (Zr, Cu) = − 23 kJ mol −1 , ΔH mix (Zr, Al) = − 44 kJ mol −1 , ΔH mix (Al, Cu) = − 1 kJ mol −1 ) [43] provides the formation of atomic short range order during undercooling, which can promote increased packing efficiency and retards long-range diffusion of the atoms [1].…”

Section: Sample Preparationmentioning

confidence: 99%

See 1 more Smart Citation

Comprehensive thermal analysis of a high stability Cu–Zr–Al bulk metallic glass subjected to high-pressure torsion

Révész

Arjmandabasi

Schafler

et al. 2023

J Therm Anal Calorim

View full text Add to dashboard Cite

Bulk metallic glass of Cu38Zr54Al8 nominal composition was synthesized by copper mold casting into 6 mm diameter rods. Disks of the as-cast glass were subjected to severe plastic deformation by high-pressure torsion for different number of revolutions. The microstructure and the thermal behavior of the as-cast, isothermally annealed and deformed glass have been investigated by X-ray diffraction and differential scanning calorimetry, respectively. Continuous heating experiments revealed a two-stage devitrification event with excellent glass forming parameters, such as glass transition (Tg = 671 K), supercooled liquid region (∆Tx = 80 K), reduced glass transition (Tr = 0.57) and gamma parameter (γ = 0.41). Power law crystal growth during diffusion-controlled homogeneous nucleation was observed for isothermal annealings. Glassy state was preserved almost in the entire sample volume of the as-cast alloy during the high-pressure torsion process, corresponding to the extreme stability of the Cu38Zr54Al8 alloy against deformation-induced devitrification. This is in accordance with the transition of the reversible specific heat from the glassy to supercooled liquid state measured by modulated calorimetry. It was also concluded that glassy structure is more ordered in the severely deformed state.

show abstract

Section: Linear Heating Experimentssupporting

confidence: 89%

Section: Sample Preparationmentioning

confidence: 99%

Comprehensive thermal analysis of a high stability Cu–Zr–Al bulk metallic glass subjected to high-pressure torsion

Révész

Arjmandabasi

Schafler

et al. 2023

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…The n exponent in the classical Avrami theory is an important parameter and represents the reason why we chose to use this theory to fit our data: n is equal to d + 1, where d is the dimensionality of the phenomenon; thus, the 2D phase changes have an exponent of 3, and the 3D ones have n = 4 [ 35 ]. When n is larger than 4, the literature refers to transient and nonlinear behaviors [ 36 , 37 , 38 , 39 ], which represent the key elements to understanding the data that will be discussed below. We used the weighted least squares fitting for this task.…”

Section: Resultsmentioning

confidence: 99%

Molecule Clustering Dynamics in the Molecular Doping Process of Si(111) with Diethyl-propyl-phosphonate

Pizzone

Grimaldi

Magna

et al. 2023

IJMS

View full text Add to dashboard Cite

The molecular doping (MD) process is based on the deposition of dopant-containing molecules over the surface of a semiconductor substrate, followed by the thermal diffusion step. Previous studies suggest that, during the deposition, the molecules nucleate clusters, and at prolonged deposition times, they grow into self-assembled layers on the sample to be doped. Little is known about the influence of nucleation kinetics on the final properties of these layers and how they change when we modify the solution properties. In this work, we examine the nucleation rate and the molecular surface coverage kinetics of diethyl-propyl phosphonate on silicon at different solution concentrations and how these conditions influence the final electrical properties of the doped samples. We present a high-resolution morphological characterization of the as-deposited molecules together with the electrical results of the final doped samples. The experimental results show a non-obvious behavior, explained through understanding of the competition between the molecules’ physisorption and chemisorption mechanisms. As a consequence, due to the deeper knowledge of the deposition phase, a finer tuning of the conductive properties of MD-doped samples is achieved.

show abstract

A Novel Approach to Analysis of Complex Crystallization Behavior in Zr-Based Bulk Metallic Glass by Non-isothermal Kinetics Studies

Biały

Hasiak

Łaszcz

2023

Metall Mater Trans A

View full text Add to dashboard Cite

The complex crystallization behavior of the Zr40Ti15Cu10Ni10Be25 bulk metallic glass (BMG) produced by suction-casting method was studied with the non-isothermal DSC measurements with the heating rate from 5 to 40 K/min. Three exothermic phenomena were observed for the investigated material. The novel evaluation procedure for qualitative and quantitative analysis of intricate crystallization kinetics for Zr-based BMGs is proposed. The unusual deconvolution of the DSC curves based on a Gaussian function and a two-phase exponential decay function allowed for separate, detailed analysis of overlapped peaks. The activation energies for each crystallization stage were studied based on overall (Kissinger) and local (Kissinger–Akahira–Sunose) procedures. The KAS method applied separately for both low and high heating rates showed a significant difference in local activation energies. Finally, the local Avrami exponent evaluation revealed that the first two stages of crystallization are diffusion-controlled with mainly increasing nucleation rate, whereas the third crystallization is more growth-dominated.

show abstract

Effective role of minor silicon addition on crystallization kinetics of Cu50Zr43Al7 bulk metallic glass

Cited by 9 publications

References 49 publications

Comprehensive thermal analysis of a high stability Cu–Zr–Al bulk metallic glass subjected to high-pressure torsion

Comprehensive thermal analysis of a high stability Cu–Zr–Al bulk metallic glass subjected to high-pressure torsion

Molecule Clustering Dynamics in the Molecular Doping Process of Si(111) with Diethyl-propyl-phosphonate

A Novel Approach to Analysis of Complex Crystallization Behavior in Zr-Based Bulk Metallic Glass by Non-isothermal Kinetics Studies

Contact Info

Product

Resources

About