Role of chemical bonding in metallic glasses

Chen, H.S; Park, B.K

doi:10.1016/0001-6160(73)90196-x

Cited by 160 publications

(28 citation statements)

References 18 publications

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“…2, the Pd 40.5 Ni 40.5 P 19 metallic glass exhibits three glass transition temperatures, 568, 624, and 646 K, respectively, suggesting that this glassy alloy might have experienced phase separation during the cooling process. It implies that there are metastable and unstable phase separating regions in the ternary Pd-Ni-P phase diagram, agreeing well with the reported results [11][12][13][14][15]. However, when 2.5at% P was replaced by Si, only single T g can be observed on the DSC curve.…”

Section: Experimental Materials and Methodssupporting

confidence: 91%

“…When the Si content ranges from 0 to 5, the GFA is enhanced, while for high Si content (9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19), the GFA is reduced. Among the studied alloys of Pd 40.5 Ni 40.5 Si x P 19−x (x=0, 2.5, 5, 9.5, 14, and 19), the Pd 40.5 Ni 40.5 Si 5 P 14 alloy possesses the largest supercooled liquid range ΔT, the largest reduced glass transition temperature T rg , and the largest γ value (0.460), which means it would possess the largest GFA.…”

Section: Resultsmentioning

confidence: 99%

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Preparation and thermal stability of Pd40.5Ni40.5Si x P19−x bulk metallic glasses

Wang

Yao

2010

Int J Miner Metall Mater

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With the addition of Si to replace some P, Pd 40.5 Ni 40.5 Si x P 19−x (x=0, 2.5, 5, 9.5, 14, and 19 in atomic number fraction) bulk glassy samples with the diameter of about 5 mm were successfully prepared by use of flux treatment and water quenching technology. With the increase of Si content, the glass forming ability of Pd 40.5 Ni 40.5 Si x P 19−x increases first for low Si content and then decreases for high Si content (Si≥9.5at%). The Pd 40.5 Ni 40.5 Si 5 P 14 glassy alloy possesses the largest supercooled liquid region ΔT of 119 K, the largest reduced glass transition temperature of 0.621, and the largest γ parameter of 0.460, indicating that this glassy alloy possesses very large glass forming ability and very high thermal stability.

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Section: Experimental Materials and Methodssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Preparation and thermal stability of Pd40.5Ni40.5Si x P19−x bulk metallic glasses

Wang

Yao

2010

Int J Miner Metall Mater

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“…͓DOI: 10.1063/1.2158130͔ Bulk metallic glasses ͑BMGs͒ as a prominent class of functional and structural materials with unique properties have attracted intensive interests due to their considerable significance in science and technology. [1][2][3][4][5][6][7][8][9][10][11] In order to make the best use of these noncrystalline materials, the key problem is to develop BMGs with improved properties and excellent glass forming ability ͑GFA͒. It is commonly regarded that the formation of metallic glasses is controlled by two factors, i.e., the cooling rate and the composition of the alloys.…”

mentioning

confidence: 99%

Binary Ni–Nb bulk metallic glasses

Xia¹,

Li²,

Fang³

et al. 2006

Journal of Applied Physics

179

105

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We studied the glass forming ability of Ni-Nb binary alloys and found that some of the alloys can be prepared into bulk metallic glasses by a conventional Cu-mold casting. The best glass former within the compositional range studied is off-eutectic Ni 62 Nb 38 alloy, which is markedly different from those predicted by the multicomponent and deep eutectic rules. The glass formation mechanism for binary Ni-Nb alloys was studied from the thermodynamic point of view and a parameter ␥ * was proposed to approach the ability of glass formation against crystallization. © 2006 American Institute of Physics. ͓DOI: 10.1063/1.2158130͔ Bulk metallic glasses ͑BMGs͒ as a prominent class of functional and structural materials with unique properties have attracted intensive interests due to their considerable significance in science and technology. [1][2][3][4][5][6][7][8][9][10][11] In order to make the best use of these noncrystalline materials, the key problem is to develop BMGs with improved properties and excellent glass forming ability ͑GFA͒. It is commonly regarded that the formation of metallic glasses is controlled by two factors, i.e., the cooling rate and the composition of the alloys. The critical cooling rate, which is the most effective gauge for GFA of the alloys, is hard to be measured experimentally. Hence, a great deal of efforts have devoted to the investigation on the composition of glass forming alloys. Inoue et al. 11 and Johnson 1 framed the empirical rules to predict the element selection and compositional range of glass forming alloys. These rules have played an important role as a guideline for synthesis of BMGs for the last decade.Binary alloys are usually considered to have a lower GFA due to their lack of complicated structure with atomic configuration according to the "confuse principal." 2,3 However, recent experimental results have shown that binary Zr-Cu alloys can also be vitrified into BMGs. [12][13][14] In contrast with the deep eutectic rule, the better glass formers in Zr-Cu binary alloy system such as Zr 35.5 Cu 64.5 and Zr 50 Cu 50 are off eutectic. Therefore, the empirical rules for glass formation, that is, multicomponent alloys with composition near deep eutectic, could be no longer the major concern for designing BMGs.In this work, we reported that some of the Ni-Nb binary alloys can be prepared into fully glassy rods up to 2 mm in diameter by a conventional Cu-mold casting method. The best glass former within the compositional range studied is off-eutectic Ni 62 Nb 38 alloy, which is different from those predicted by the multicomponent and deep eutectic rules. The glass formation mechanism of the binary alloys was studied from the thermodynamic point of view based on Miedema's calculation model.Ingots of Ni-Nb binary alloys with different compositions were prepared separately by arc-melting of 99.9% ͑at. %͒ pure Ni and Nb in titanium-gettered argon atmosphere. The rods of 2 mm in diameter were prepared by suction casting under argon atmosphere. The structure of the samples was charact...

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“…The partial molar volumes of Cu and Si in glassy Pd-Cu-Si alloys are approximately equal and about 15~ smaller than that of Pd [84]. However, the Si content alone determines the glass forming region.…”

Section: Jr0mentioning

confidence: 91%

“…Sinha and Duwez [16] interpreted this as being due to a greater degree of disorder in these glassy alloys. Chen and Park [84] point out that Au-Si is a purely eutectic system with no intermetallic compound. A metastable y phase was formed on crystallization of the amorphous Au-Si alloy.…”

Section: Jr0mentioning

confidence: 99%

Structure of metallic glasses

Gokularathnam

1974

J Mater Sci

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Metallic glasses or amorphous alloys have been produced by rapid quenching of alloys from the liquid or vapour phase.This paper is a review of the studies on the structure of metallic glasses. The theory of diffraction by amorphous materials is dealt with at length followed by a description of the procedure of obtaining and analysing the RDF of amorphous alloys.Various models have been put forward to explain the structure of the metallic glasses, and these are fully discussed. A dense random packing model or modifications thereof can best explain the structure and range of stability of amorphous alloys.

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Role of chemical bonding in metallic glasses

Cited by 160 publications

References 18 publications

Preparation and thermal stability of Pd40.5Ni40.5Si x P19−x bulk metallic glasses

Preparation and thermal stability of Pd40.5Ni40.5Si x P19−x bulk metallic glasses

Binary Ni–Nb bulk metallic glasses

Structure of metallic glasses

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