The Effect of Iron Content on Glass Forming Ability and Thermal Stability of Co–Fe–Ni–Ta–Nb–B–Si Bulk Metallic Glass

Hitit, Aytekin; Şahin, Hakan

doi:10.3390/met7010007

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…Considering the mechanical properties, the best performance shows an alloy with the composition Co 43 Fe 20 Ta 5.5 B 31.5 [6,9], which exhibits an ultra-high fracture strength of 5185 MPa, ultra-high Young s modulus of 268 GPa and large supercooled region of 72 K [10]. In order to further enhance its GFA, a few research groups investigated the effect of alloying base alloy composition Co 43 Fe 20 Ta 5.5 B 31.5 by selected elements: Mo, Si [6], Cr, Si [11], Nb [12], Cu, Si [13], Ni, Si [14], Ni, Nb, Si [15]. However, metallic glasses produced by rapid solidification techniques suffer from the limitations imposed by chemical composition range due to the mutual constrained solubility of elements or their largely different melting points.…”

Section: Introductionmentioning

confidence: 99%

Structural Evolution in Wet Mechanically Alloyed Co-Fe-(Ta,W)-B Alloys

Girman

Lisnichuk

Yudina

et al. 2021

Metals

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In the present study, the effect of wet mechanical alloying (MA) on the glass-forming ability (GFA) of Co43Fe20X5.5B31.5 (X = Ta, W) alloys was studied. The structural evolution during MA was investigated using high-energy X-ray diffraction, X-ray absorption spectroscopy, high-resolution transmission electron microscopy and magnetic measurements. Pair distribution function and extended X-ray absorption fine structure spectroscopy were used to characterize local atomic structure at various stages of MA. Besides structural changes, the magnetic properties of both compositions were investigated employing a vibrating sample magnetometer and thermomagnetic measurements. It was shown that using hexane as a process control agent during wet MA resulted in the formation of fully amorphous Co-Fe-Ta-B powder material at a shorter milling time (100 h) as compared to dry MA. It has also been shown that substituting Ta with W effectively suppresses GFA. After 100 h of MA of Co-Fe-W-B mixture, a nanocomposite material consisting of amorphous and nanocrystalline bcc-W phase was synthesized.

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Section: Introductionmentioning

confidence: 99%

Structural Evolution in Wet Mechanically Alloyed Co-Fe-(Ta,W)-B Alloys

Girman

Lisnichuk

Yudina

et al. 2021

Metals

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The effects of tantalum addition on the glass forming ability, thermal stability, and mechanical properties of Ni-Co-W-B bulk metallic glasses

Hitit

Yazici

Öztürk

et al. 2021

Journal of Non-Crystalline Solids

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Phase Transformations from Nanocrystalline to Amorphous (Zr70Ni25Al5)100-xWx (x; 0, 2, 10, 20, 35 at. %) and Subsequent Consolidation

et al. 2021

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Glasses, which date back to about 2500 BC, originated in Mesopotamia and were later brought to Egypt in approximately 1450 BC. In contrast to the long-range order materials (crystalline materials), the atoms and molecules of glasses, which are noncrystalline materials (short-range order) are not organized in a definite lattice pattern. Metallic glassy materials with amorphous structure, which are rather new members of the advanced materials family, were discovered in 1960. Due to their amorphous structure, metallic glassy alloys, particularly in the supercooled liquid region, behave differently when compared with crystalline alloys. They reveal unique and unusual mechanical, physical, and chemical characteristics that make them desirable materials for many advanced applications. Although metallic glasses can be produced using different techniques, many of these methods cannot be utilized to produce amorphous alloys when the system has high-melting temperature alloys (above 1500 °C) and/or is immiscible. As a result, such constraints may limit the ability to fabricate high-thermal stable metallic glassy families. The purpose of this research is to fabricate metallic glassy (Zr70Ni25Al5)100-xWx (x; 0, 2, 10, 20, and 35 at. %) by cold rolling the constituent powders and then mechanically alloying them in a high-energy ball mill. The as-prepared metallic glassy powders demonstrated high-thermal stability and glass forming ability, as evidenced by a broad supercooled liquid region and a high crystallization temperature. The glassy powders were then consolidated into full-dense bulk metallic glasses using a spark plasma sintering technique. This consolidation method did not result in the crystallization of the materials, as the consolidated buttons retained their short-range order fashion. Additionally, the current work demonstrated the capability of fabricating very large bulk metallic glassy buttons with diameters ranging from 20 to 50 mm. The results indicated that the microhardness of the synthesized metallic glassy alloys increased as the W concentration increased. As far as the authors are aware, this is the first time this metallic glassy system has been reported.

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The Effect of Iron Content on Glass Forming Ability and Thermal Stability of Co–Fe–Ni–Ta–Nb–B–Si Bulk Metallic Glass

Cited by 3 publications

References 25 publications

Structural Evolution in Wet Mechanically Alloyed Co-Fe-(Ta,W)-B Alloys

Structural Evolution in Wet Mechanically Alloyed Co-Fe-(Ta,W)-B Alloys

The effects of tantalum addition on the glass forming ability, thermal stability, and mechanical properties of Ni-Co-W-B bulk metallic glasses

Phase Transformations from Nanocrystalline to Amorphous (Zr70Ni25Al5)100-xWx (x; 0, 2, 10, 20, 35 at. %) and Subsequent Consolidation

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