Designing ductile CuZr-based metallic glass matrix composites

Liu, Y.J.; Yao, Hongwei; Zhang, T.W.; Wang, Z.; Wang, Y.S.; Qiao, J.W.; Yang, Huijun; Wang, Z.H.

doi:10.1016/j.msea.2016.11.079

Cited by 36 publications

(5 citation statements)

References 49 publications

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“…These two mechanisms may be the responsible for the high variation in the elastic modulus (on the surface) of the sample. It is known that crystalline phases like CuZr, C10Zr7, and CuZr2 are responsible for increasing the plasticity of BMG, causing impact above microhardness, which may decrease its value [27,28].…”

Section: Resultsmentioning

confidence: 99%

Atomic Force Microscopy Applied to the Study of Metallic Glasses Alloys Based on CuZrAlEr and CuZrAl

Lustosa

Marques

Florêncio³

2022

DDF

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Metallic glasses are materials that present absence of periodic atomic order of long scale and seem to be promising to application in the fields of science and engineering. They were first obtained in 1960 through the technique of rapid cooling with thinner thickness, but the development of new production techniques and the combination of elements allowed the production of amorphous condition in millimeter-thick alloys, which received the denomination of bulk metallic glasses. Two alloys of metallic glasses, with the Cu47.5Zr45.5Al5Er2 and Cu47.75Zr47.75Al4.5 compositions, were here studied. Their production was made through arc furnace, and the characterization through X-ray diffraction (XRD), with Cu Kα radiation, Scanning Electron Microscope (SEM), ultra-microhardness tester, and Atomic Force Microscopy (AFM), from Nanoscope IIIA. The analysis of the atomic structure of the Cu47.5Zr45.5Al5Er2 alloy showed great structural disorder, and the Cu47.75Zr47.75Al4.5 sample presented peaks arising from crystalline phases, like Zr4Cu2O (big cubic phase) formed due to the affinity between zirconium and oxygen, in the amorphous matrix. Using the AFM, the Cu47.5Zr45.5Al5Er2 sample presented the values of 2.15 nm from Ra (roughness average) and 3.14 nm from RMS (Root Mean Square). Another sample has shown better results of roughness, where Ra was 1.88 nm and the RMS was 2.53 nm. As it is known, roughness is an import tribological parameter in materials and lower values allow that less surface area is exposed to harmful atmospheric effects such as corrosion, as evidence of the advantage of the sample with erbium.

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Section: Resultsmentioning

confidence: 99%

Atomic Force Microscopy Applied to the Study of Metallic Glasses Alloys Based on CuZrAlEr and CuZrAl

Lustosa

Marques

Florêncio³

2022

DDF

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“…When crystalline materials are subjected to an external force, dislocations are produced, which lead to plastic deformation (i.e., dislocation slip). However, amorphous materials have only a short-range atomic structure [5], and their atoms are irregularly arranged. Thus, their structure is similar to that of a liquid, and hence they do not undergo dislocation slip or present any of the other defects exhibited by crystalline materials.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and failure mechanisms of Zr-based amorphous alloys with various element compositions under different strain rates

Chen

Wang²,

Hsieh

et al. 2023

Mater. Res. Express

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This study investigated the mechanical properties, glass-forming ability (GFA), and microstructural evolution of ZrCuAlNi amorphous alloys with various niobium (Nb) and silver (Ag) additions under static (1x10-1 – 1x10-3 s-1) and dynamic (3x103 – 5x103 s-1) loading conditions. The X-ray diffraction (XRD) results revealed that all of the alloys had an amorphous structure, and the GFA improved with an increasing Ag content. The Zr56Cu24Al9Ni7Nb1Ag3 alloy showed the highest flow stress among the various alloys under both strain rate ranges. For all of the alloys, the fracture strain increased with an increasing Ag content. Moreover, the strain rate sensitivity increased with increasing strain rate. The scanning electron microscopy observations showed that the fracture surfaces had a dimple structure. As the Ag content increased, the dimple structure changed from a smooth to molten appearance. In addition, the dimple structure density increased with an increasing strain rate. The results present that the ductility of the ZrCuAlNi amorphous alloys could be improved by increasing the Ag element content.

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“…The poor plastic deformation results from highly localized shear banding as well as shear softening [3][4][5]. The catastrophic brittle deformation becomes the major weakness for wide structural application of MGs as engineering materials [6][7][8]. To circumvent the problem of room-temperature brittleness, several post treatment methods have been introduced including surface mechanical treatment [9], defect printing [10], ion irradiation [11], notching [12], and ultrasonic excitation [13].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the mechanically-induced nanocrystallization in metallic glasses

Ammari

Yousfi

Hajlaoui

et al. 2021

Journal of Alloys and Compounds

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Designing ductile CuZr-based metallic glass matrix composites

Cited by 36 publications

References 49 publications

Atomic Force Microscopy Applied to the Study of Metallic Glasses Alloys Based on CuZrAlEr and CuZrAl

Atomic Force Microscopy Applied to the Study of Metallic Glasses Alloys Based on CuZrAlEr and CuZrAl

Mechanical properties and failure mechanisms of Zr-based amorphous alloys with various element compositions under different strain rates

Investigation on the mechanically-induced nanocrystallization in metallic glasses

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