A New Ni-Based Metallic Glass with High Thermal Stability  and Hardness

Hitit, Aytekin; Şahin, Hakan; Öztürk, Pelin; Aşgın, Ahmet Malik

doi:10.3390/met5010162

Cited by 15 publications

(3 citation statements)

References 31 publications

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“…T. Bitoh and D. Watanabe show, for example, that incorporation of Y in the amorphous structure of Fe-Co-B-Si-Nb bulk metallic glasses induces changes in their glass forming ability and the magnetic properties of these alloys [18]. The properties of newly developed Ni-Cu-W-B metallic glasses are reported by A. Hitit et al [19]. The current theories describing the links between toughness and material parameters, including elastic constants, alloy chemistry and ordering degree in the glass are reviewed by S. V. Madge [20].…”

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confidence: 85%

Metallic Glasses

Chan¹,

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2015

Metals

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Metallic glasses are a fascinating class of metallic materials that do not display long-range atomic order. Due to their amorphous character and the concomitant lack of dislocations, these materials exhibit mechanical properties that are quite different from those of other solid materials [1,2]. For example, they can be twice as strong as steels, show more elasticity and fracture toughness than ceramics and be less brittle than conventional oxide glasses. In addition to their unique mechanical properties, metallic glasses have also demonstrated interesting physical and chemical properties. For example, some metallic glasses have been found to exhibit superior soft magnetic properties [3], good magnetocaloric effects [4] and outstanding catalytic performance [5], thus having potential for a widespread range of technological applications [6].Metallic glasses become relatively malleable when heated in the supercooled liquid region, allowing moulding and shaping with microscale precision by means of thermoplastic processing [7]. This has facilitated the development of diverse products based on these alloys, including sporting goods, medical and electronic devices and advanced defence and aerospace applications. However, in spite of their large elasticity, metallic glasses exhibit poor room-temperature macroscopic plasticity compared to polycrystalline metals [8]. This low plastic deformation, particularly evidenced when testing metallic glasses under tension, is related to the formation and rapid propagation of shear bands [2]. Therefore, novel routes to enhance plasticity of metallic glasses include procedures to hinder shear band propagation. This can be achieved, for example, by designing composite materials consisting of particles which act as second-phase reinforcements embedded in the amorphous matrix [9,10]. Other approaches towards toughening of metallic glasses have also been developed, such as the preparation of the so-called dual-phase amorphous metals [11], some specific surface treatments (e.g., laser or shot pinning) [12], or making their overall structure porous (i.e., metallic glass foams) [13]. OPEN ACCESS

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Metallic Glasses

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“…However as second-phase reinforcements embedded in the amorphous matrix may be present antiferromagnetic phase, which may be hard to detect by macroscopic magnetic measurements. Multicomponent bulk metallic glasses (BMG) have attracted great attention [30] because of their unusual physical, chemical and mechanical properties [31]. Mechanical relaxation of metallic glasses was overviewed (experimental data and theoretical models) in [32].…”

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confidence: 99%

NMR and the antiferromagnetic crystal phase regions in rapidly quenched ribbons and in alloys of the type $Cu-Mn-Al$

Hudak,

Tothova,

Hudak

2018

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It was shown that anomalous resistivity behavior of the Cu − M n − Al ribbons is explained by the s-d interaction between conduction electrons and the clustered Mn atoms. While nuclear magnetic resonance measurements show the antiferromagnetic and ferromagnetic clusters of Mn atom coexisting without long-range order, it is an interesting problem to study magnetic resonance properties also for the antiferromagnetic crystal phase regions (which have long-range order for larger regions) and which may also occur in these ribbons. The Heusler Type Cu − M n − Al Alloy has a composition half way between Cu2M nAl and Cu3Al. Electron microscopy of the premartensitic βCu − Zn − Al alloy has shown that the βCu − Zn − Al alloy quenched from high temperature has the electron diffraction patterns of this alloy well explained by the model with the existence of small particles with an orthorhombic structure. It was noted that an important aspect of improvement in the material properties is to create a nanostructured state in matrix, which has significant advantages in magnetic and mechanical characteristics in contrast to the bulk materials in crystalline or amorphous state. It is an interesting problem to study magnetic resonance properties not only for the Mn atoms and clusters without long-range order but also for the antiferromagnetic crystal phase regions (which have long-range order for larger regions) which may also occur in ribbons. This is the aim of our paper.

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“…The laser-clad materials are therefore bulk metallic glasses (BMGs) of high glass-forming abilities (GFAs) in order to obtain as much amorphous content as possible. In recent years, many research works have been conducted to prepare Zr-, Cu-, Ni-, Co-, and Fe-based amorphous composite coatings using this technique [7][8][9][10][11][12]. Among the many amorphous alloy systems, transition metal-metalloid-based BMGs are the most promising to be used for laser cladding materials due to their high GFAs as well as wear and corrosion resistance properties.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Wear Resistance of Laser-Clad (Co, Ni)61.2B26.2Si7.8Ta4.8 Coatings

Zhang

Wang

Qian

et al. 2017

Metals

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It has been reported that a quaternary Co 61.2 B 26.2 Si 7.8 Ta 4.8 alloy is a good glass former and can be laser-clad to an amorphous composite coating with superior hardness and wear resistance. In this paper, alloys with varying Ni contents to substitute for Co are coated on the surface of #45 carbon steel using a 5-kW CO 2 laser source for the purpose of obtaining protective coatings. In contrast to the quaternary case, the clad layers are characterized by a matrix of α-(Fe, Co, Ni) solid solution plus CoB, Co 3 B, and Co 3 Ta types of precipitates. The cladding layer is divided into four regions: Near-surface dendrites, α-(Fe, Co, Ni) solid solution plus dispersed particles in the middle zone, columnar bonding zone, and heat-affected area that consists of martensite. The hardness gradually decreases with increasing Ni content, and the maximum hardness occurs in the middle zone. Both the friction coefficient and wear volume are minimized in the alloy containing 12.2% Ni. Compared with the previous cobalt-based quaternary alloy Co 61.2 B 26.2 Si 7.8 Ta 4.8 , the addition of the Ni element reduces the glass-forming ability and henceforth the hardness and wear resistance of the clad layers.

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A New Ni-Based Metallic Glass with High Thermal Stability and Hardness

Cited by 15 publications

References 31 publications

Metallic Glasses

Metallic Glasses

NMR and the antiferromagnetic crystal phase regions in rapidly quenched ribbons and in alloys of the type $Cu-Mn-Al$

Microstructure and Wear Resistance of Laser-Clad (Co, Ni)61.2B26.2Si7.8Ta4.8 Coatings

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