Comparison of properties of nanocrystalline and amorphous Ni-P alloys

Lu, K.; Wang, J T; Wei, Wanghe

doi:10.1088/0022-3727/25/5/010

Cited by 63 publications

(34 citation statements)

References 11 publications

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“…The shape of the specific heat versus temperature for the Ni-P glass is typical, bearing close similarity to the experimental specific heat curve of Pd-Ni-Cu-P. 72 Similar specific heat behavior was reported for other binary glass formers recently 19 in computer simulation and was linked to their internal structural changes. In the glassy state, the specific heat of the simulated Ni-P MG compares favorably with the experimental data of Ni-P MG (24.9 J/K-mol at 400 K 73 ). The glass-transition temperature T g % 575 K was estimated from the departure of the potential energy from its linear relationship with temperature.…”

Section: Computational Approaches For Metallic Glass Simulationsupporting

confidence: 64%

Relating Dynamic Properties to Atomic Structure in Metallic Glasses

Sheng

Kramer

2012

JOM

122

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Atomic packing in metallic glasses is not completely random but displays various degrees of structural ordering. While it is believed that local structures profoundly affect the properties of glasses, a fundamental understanding of the structure-property relationship has been lacking. In this article, we provide a microscopic picture to uncover the intricate interplay between structural defects and dynamic properties of metallic glasses, from the perspective of computational modeling. Computational methodologies for such realistic modeling are introduced. Exploiting the concept of quasi-equivalent cluster packing, we quantify the structural ordering of a prototype metallic glass during its formation process, with a new focus on geometric measures of subatomic ''voids.'' Atomic sites connected with the voids are found to be crucial in terms of understanding the dynamic, including vibrational and atomic transport, properties. Normal mode analysis is performed to reveal the structural origin of the anomalous boson peak (BP) in the vibration spectrum of the glass, and its correlation with atomic packing cavities. Through transition-state search on the energy landscape of the system, such structural disorder is found to be a facilitating factor for atomic diffusion, with diffusion energy barriers and diffusion pathways significantly varying with the degree of structural relaxation/ordering. The implications of structural defects for the mechanical properties of metallic glasses are also discussed.

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Section: Computational Approaches For Metallic Glass Simulationsupporting

confidence: 64%

Relating Dynamic Properties to Atomic Structure in Metallic Glasses

Sheng

Kramer

2012

JOM

122

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“…Δα is the difference in thermal expansion coefficients between the matrix (Al CTE ∼23.1 Â 10 −6 K −1 ) and the reinforcing particles (∼15.0 Â 10 −6 K −1 , based on Ni-P amorphous system [50]). ΔT is the temperature change from the processing temperature to room temperature.…”

Section: Strength Predictionmentioning

confidence: 99%

Structural and mechanical properties of Ni60Nb40 amorphous alloy particle reinforced Al-based composites produced by microwave-assisted rapid sintering

Jayalakshmi

Gupta

Sankaranarayanan

et al. 2013

Materials Science and Engineering: A

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“…Many methods, such as vapor deposition, 1 mechanical alloying, 2 crystallization of an amorphous alloy, 3 etc., have been used to prepare nanocrystalline materials in the form of powders or thin films. In order to study and apply the properties of nanocrystalline materials in theory and practice, a number of methods for producing bulk nanocrystalline materials have been developed, i.e., the consolidation of powders with nanometer scale, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of high pressure on the preparation of Pd–Si–Cu bulk nanocrystalline material

Yao

Ding²,

Sui

et al. 1996

J. Mater. Res.

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A Pd-Si-Cu bulk nanocrystalline material was prepared by quenching the melted Pd 78 Si 16 Cu 6 alloy at a cooling rate of 200 K͞s under 2-6 GPa. It was found that the nanocrystalline material consists of Pd(Cu) disordered solid solution and a metastable phase-II, Pd 4 Si. The grain size was found to decrease with increasing pressure. The influence of high pressure on the grain size of bulk nanocrystalline material is discussed, and a possible formation mechanism is proposed.

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Comparison of properties of nanocrystalline and amorphous Ni-P alloys

Cited by 63 publications

References 11 publications

Relating Dynamic Properties to Atomic Structure in Metallic Glasses

Relating Dynamic Properties to Atomic Structure in Metallic Glasses

Structural and mechanical properties of Ni60Nb40 amorphous alloy particle reinforced Al-based composites produced by microwave-assisted rapid sintering

Effect of high pressure on the preparation of Pd–Si–Cu bulk nanocrystalline material

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