Theoretical prediction of temperature dependent shear modulus of bulk metallic glasses

2017 ◽  
Vol 91 ◽  
pp. 86-89 ◽  
Author(s):  
Xianhe Zhang ◽  
Weiguo Li ◽  
Ying Li ◽  
Jianzuo Ma ◽  
Yong Deng ◽  
...  
Keyword(s):  
Shear Modulus ◽  
Theoretical Prediction ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Temperature Dependent

Improving plasticity and toughness of Cu-Zr-Y-Al bulk metallic glasses via compositional tuning towards the CuZr

2010 ◽  
Vol 25 (2) ◽  
pp. 375-382 ◽  
Author(s):  
Yong Shen ◽  
Jian Xu
Keyword(s):  
Shear Modulus ◽  
Intermetallic Compounds ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Critical Diameter ◽  
Glass Forming Ability ◽  
Al Alloys ◽  
Simple Approach ◽  
Glass Forming ◽  
Tie Line

In this work, we propose a simple approach for designing plastic bulk metallic glasses (BMGs) by exploiting the ductility of intermetallic compounds involved in the BMG-forming system. Its validity was examined by investigating a series of quaternary Cu-Zr-Y-Al alloys along the composition tie-line between Cu42Zr44.4Y3.6Al10 (Y1) and the B2 CuZr phase, expressed as (Cu0.5Zr0.5)x(M)100-x (M = Zr0.15Y0.225Al0.625, 84≤x≤93). When tuning the composition towards the CuZr, the glass-forming ability of alloys is dramatically degraded, showing a reduction of critical diameter Dc for BMG formation from 16 mm at x = 84 (Y1) to 2 mm at x = 93. As the composition of BMGs shifts to the CuZr terminal, the shear modulus μ of the BMGs decreases, whereas the Poisson's ratio ν increases. With respect to the Y1 BMG, compressive plasticity and toughness of the Y2 BMG (x = 92, Dc = 4 mm) with a higher concentration of the CuZr are improved, which is consistent with its lower μ and higher ν values.

Calculation of the Temperature Dependence of the Unrelaxed Shear Modulus of High-Entropy Bulk Metallic Glasses from Calorimetric Data

JETP Letters ◽  
2020 ◽  
Vol 111 (10) ◽  
pp. 586-590
Author(s):  
A. S. Makarov ◽  
E. V. Goncharova ◽  
G. V. Afonin ◽  
J. C. Qiao ◽  
N. P. Kobelev ◽  
...  
Keyword(s):  
Shear Modulus ◽  
Temperature Dependence ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Calorimetric Data ◽  
High Entropy

scholarly journals Short Range Chemical Ordering in Bulk Metallic Glasses

2000 ◽  
Vol 644 ◽  
Author(s):  
P. A. Sterne ◽  
P. Asoka-Kumar ◽  
J. H. Hartley ◽  
R. H. Howell ◽  
T.G. Nieh ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Critical Density ◽  
Positron Annihilation Spectroscopy ◽  
Atomic Scale ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Chemical Ordering ◽  
Open Volume

AbstractWe provide direct experimental evidence for a non-random distribution of atomic constituents in Zr-based multi-component bulk metallic glasses using positron annihilation spectroscopy. The Ti content around the open-volume regions is significantly enhanced at the expense of Cu and Ni, indicating that Cu and Ni occupy most of the volume bounded by their neighboring atoms while Ti and Zr are less closely packed and more likely to be associated with open-volume regions. Temperature-dependent measurements indicate the presence of at least two different characteristic sizes for the open volume regions. Measurements on hydrogen- charged samples show that the larger open-volume regions can be filled by hydrogen up to a critical density. Beyond this critical density, local atomic-scale open-volume damage is created in the sample to accommodate additional hydrogen. The onset of this local damage in positron annihilation data coincides with the onset of volume expansion in X-ray diffraction data.

A Gold-Based Bulk-Solidifying Amorphous Alloy for Jewelry — Comparison with a Palladium-Based Amorphous Alloy

2014 ◽  
Vol 783-786 ◽  
pp. 1901-1906 ◽  
Author(s):  
Sandrine Cardinal ◽  
Ji Chao Qiao ◽  
Jean Marc Pelletier
Keyword(s):  
Amorphous Alloy ◽  
Shear Modulus ◽  
Metallic Glasses ◽  
Cold Working ◽  
Bulk Metallic Glasses ◽  
High Hardness ◽  
Gold Alloys ◽  
Cast State ◽  
Casting Technique ◽  
Aesthetic Appearance

The gold alloys are used in jewelry for their aesthetic appearance and inertia to the environment. In jewelry a hardness superior to 300 HV is desirable to facilitate the final machining and reduce the wear of the final product. The maximum hardness that can be obtained with the standard 18 carats gold (Au75-Ag12.5-Cu12.5 (wt%)) through a combination of heat treatment and cold working is about 290 HV. Gold-based bulk metallic glasses (BMGs) are an alternative as they present unique properties in comparison with crystalline counterparts, especially easy thermoplastic processing combined with a high hardness. Pd-base BMGs are another solution, due also to their attractive features.An Au49Cu26.9Si16.3Ag5.5Pd2.3 (% at.) and a Pd40Cu30Ni10P20 (% at.) bulk metallic glasses were fabricated by a copper mould suction casting technique in an argon atmosphere. In the as-cast state hardness, shear modulus and hardness are high (HV0.3= 360 and 530 in the Au-and Pd-base BMGs, respectively). Various heat treatments have been performed to modify the microstructural state. Formation of crystalline particles induces an increase of both shear modulus and hardness but a drastic decrease in toughness and therefore this formation should be absolutely avoided during casting or thermo processing.

High-strength Cu–Ti-rich bulk metallic glasses and nano-composites

2003 ◽  
Vol 94 (5) ◽  
pp. 615-620 ◽  
Author(s):  
Mariana Calin ◽  
Jürgen Eckert ◽  
Ludwig Schultz
Keyword(s):  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
High Strength ◽  
Nano Composites
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