Single- and Multistage Crystallization of Amorphous Alloys

Терехов, С. В.

doi:10.1134/s0031918x20070108

Cited by 10 publications

(3 citation statements)

References 10 publications

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“…The development of alloy compositions that allow us to obtain an amorphous state in ingots with large cross-sections has facilitated the wide industrial use of metallic glasses [3]. The amorphous structure of alloys is thermally unstable and, upon heating, tends to transform into a stable crystalline state [4,5]. Quite often, structural transformations of the amorphous phase passes through high-temperature metastable states [6].…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of Amorphous Quasi-High-Entropy Fe-Co-Ni-Cr-(Mo,V)-B Alloys with Various Boron Content

Базлов

Ubyivovk²,

Parkhomenko

et al. 2023

Metals

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This study focuses on the effect of replacing molybdenum with vanadium in rapidly quenched quasi-high-entropy alloys of the Fe-Co-Ni-Cr-(Mo,V)-B system. The paper analyzes the effect of the chemical composition of alloys with different boron content levels on structure formation, characteristic temperatures of alloys, and mechanical properties. An analysis of the relationship between the structure of alloys and their properties is performed. X-ray diffraction and scanning electron microscopy methods were used in the work to establish the structural dependencies. Characteristic temperatures were determined by differential scanning calorimetry. It is suggested that the addition of vanadium to the alloys of this system leads to the formation of vanadium nitrides in the structure, due to the binding of dissolved nitrogen. Furthermore, it is found that replacing molybdenum with vanadium leads to an increase in the thermal stability of the amorphous phase.

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Section: Introductionmentioning

confidence: 99%

Structure and Properties of Amorphous Quasi-High-Entropy Fe-Co-Ni-Cr-(Mo,V)-B Alloys with Various Boron Content

Базлов

Ubyivovk²,

Parkhomenko

et al. 2023

Metals

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“…Amorphous alloys, also known as metallic glasses, have a unique arrangement of short-range ordered and long-range disordered atoms and the absence of defects, such as grain boundaries and dislocations [1,2]. Compared with conventional crystalline materials, amorphous alloys have excellent physical properties, chemical properties and biocompatibility, such as high strength, high hardness, high ductility, and good corrosion resistance [3,4]. These properties earn them application potential in the field of medical devices [5][6][7].…”

Section: Introductionmentioning

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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“…Amorphous alloys are relative to crystalline alloys, which are usually cooled down rapidly to suppress the generation of grains inside the material. Amorphous alloys are characterized by longrange disorder, which is disordered in three-dimensional space, without composition segregation and inclusions, and have a denser internal structure compared to crystals, which gives them excellent physical properties, chemical properties and biocompatibility, such as high strength, high hardness, high ductility, and good corrosion resistance [1,2]. Moreover, amorphous alloys have superplasticity in the supercooled liquid region and this makes them easy to process.…”

mentioning

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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Single- and Multistage Crystallization of Amorphous Alloys

Cited by 10 publications

References 10 publications

Structure and Properties of Amorphous Quasi-High-Entropy Fe-Co-Ni-Cr-(Mo,V)-B Alloys with Various Boron Content

Structure and Properties of Amorphous Quasi-High-Entropy Fe-Co-Ni-Cr-(Mo,V)-B Alloys with Various Boron Content

Crystallization of Zr-Based Amorphous Alloys in Laser Welding

Crystallization of Zr-Based Amorphous Alloys in Laser Welding

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