Effects of alloying elements on crystallization kinetics of Ti–Zr–Be bulk metallic glass

Gong, Pan; Wang, Xin; Yao, Kefu

doi:10.1007/s10853-016-9835-5

Cited by 24 publications

(9 citation statements)

References 35 publications

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“…The activation energies for glass transition (E g ) and crystallization (E x ) of Pd 81 Si 19 6 (259 kJ/mol), 27 the high activation energy of the Pd-Si alloy already indicates that it has a high thermal stability even as a binary alloy. For the ternary Pd-Cu-Si alloys, Cu additions have even enhanced the activation energy from 341 kJ/mol to 499 kJ/mol.…”

Section: B Effect Of Cu Addition On the Thermal Stability In The Pd-mentioning

confidence: 99%

Effect of copper addition on the glass forming ability in Pd-Si binary amorphous alloying system

et al. 2017

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The effect of copper addition on the glass forming ability in Pd-Si amorphous alloys was systematically studied by X-ray diffraction and differential scanning calorimeter with a binary alloy series of Pd81+xSi19-x (x=0, 1, 1.5, 2, 2.5, 3, 4) and a ternary alloy series of Pd83.5-xCuxSi16.5 (x=0, 2, 4, 6, 8, 10, 12). It has been found that the critical size of the Pd-Si alloys could be improved significantly from 8mm to 15mm and ΔTx could be enhanced from 18.7 K to 54.7 K with the addition of copper. The determined activation energy demonstrates that Cu additions improve the thermal stability of the system significantly. The different results of the measured criteria to evaluate the GFA for the Pd-Si and the Pd-Cu-Si alloys may be linked to a different crystallization behavior. The enhanced GFA is linked to a more thermodynamically stable liquid and a reduction of atomic diffusion in the ternary alloy by Cu addition.

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Section: B Effect Of Cu Addition On the Thermal Stability In The Pd-mentioning

confidence: 99%

Effect of copper addition on the glass forming ability in Pd-Si binary amorphous alloying system

et al. 2017

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“…The summary of this law provides empirical guidance for the preparation of amorphous alloys. However, the glass transition temperature of amorphous alloys is generally not high (300 ~ 600℃)[8, [13][14][15][16], and the initial crystallization activation energy of them is also low (No more than 600 kJ/mol) [17][18][19][20]. Therefore, the stability of these amorphous alloys was poor under harsh service conditions, which changed the microstructure of the coating and further affected the performance of the coating.…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism of Al2O3-YAG Amorphous Ceramic Coating Deposited via Atmospheric Plasma Spraying

Zhang

Zhong

et al. 2021

Preprint

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This study mainly investigated the formation mechanism of Al2O3-YAG(Al5Y3O12) amorphous coating prepared by atmospheric plasma spraying. Nano and micro-sized powders with low eutectic point ratio were selected as raw materials for comparison. XRD, SEM and EBSD were used to analyze the phase composition, morphologies, phase distribution and structure of the coating. The crystal structures of the possible existed phases were studied to analyze the crystallization chemistry of powder droplets. It is concluded that the composition ratio of powders and particle size should be also considered as the key factors for the preparation of amorphous coatings besides the high enthalpy and ultra-fast cooling rate of thermal spray technology. The as-sprayable powder chose multiple components with low eutectic point ratio distributed uniformly at nano-scale or sub-micro scale, and can reacted to form the new phase crystal with high coordination numbers of cations.

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“…For example, among Ti-Zr-Be-Fe-Cu BMG alloys, the GFA of Ti 37.31 Zr 22.75 Be 25.48 Fe 5.46 Cu 9 BMG is the best one, and the critical size of as-cast rod with full glassy structure is >32 mm in diameter, but its plasticity is relatively poor (less than 1%) [12]. If the Cu or Fe content of Ti-Zr-Be-Fe-Cu alloys changes (so-called alloying), then the plasticity would be greatly improved but the GFA would be obviously decreased [12,15,16]. For high strength structural materials, certain plasticity usually is required not only for mechanical property, but also for service safety [17].…”

Section: Introductionmentioning

confidence: 99%

Improved Plasticity of Ti-Based Bulk Metallic Glass at Room Temperature by Electroless Thin Nickel Coating

Wang¹,

Hu²,

Zhao³

et al. 2017

Metals

Self Cite

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By restricting the dilated deformation, surface modification can stimulate multiple shear banding and improve the plasticity of bulk metallic glasses (BMGs). Aimed at modifying the surface of BMGs by thin layers, a crystalline Ni coating with ultrafine grains was coated on the surface of a Ti-based BMG by electroless plating. With a thickness of about 10 µm, the prepared thin coating could effectively limit the fast propagation of primary shear bands and stimulate the nucleation of multiple shear bands. As a result, the compression plasticity of the coated Ti-based BMG was improved to about 3.7% from near 0% of the non-coated BMG. Except for a small amount of Ni coating was adhered to the BMG substrate after fracture, most of the coatings were peeled off from the surface. It can be attributed to the abnormal growth of some coarse grains/particles in local region of the coating, which induces a large tensile stress at the interface between the coating and the BMG substrate. It is suggested that, for electroless nickel plating, improving the adhesive bonding strength between the coating and the substrate has a better geometric restriction effect than simply increasing the thickness of the coating.

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Effects of alloying elements on crystallization kinetics of Ti–Zr–Be bulk metallic glass

Cited by 24 publications

References 35 publications

Effect of copper addition on the glass forming ability in Pd-Si binary amorphous alloying system

Effect of copper addition on the glass forming ability in Pd-Si binary amorphous alloying system

Formation Mechanism of Al2O3-YAG Amorphous Ceramic Coating Deposited via Atmospheric Plasma Spraying

Improved Plasticity of Ti-Based Bulk Metallic Glass at Room Temperature by Electroless Thin Nickel Coating

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