scholarly journals Thermophysical properties of liquid Zr52.5Cu17.9Ni14.6Al10Ti5—prospects for bulk metallic glass manufacturing in space

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
M. Mohr ◽  
R. K. Wunderlich ◽  
D. C. Hofmann ◽  
H.-J. Fecht
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Metallic Glasses ◽  
Thermophysical Properties ◽  
Space Station ◽  
Metal Alloys ◽  
Unlubricated Wear ◽  
Wide Range ◽  
Electromagnetic Levitator ◽  
Capacity Surface

Abstract Bulk metallic glasses are of critical interest for a wide range of applications, including their use in spacecraft gearboxes and mechanisms due to their excellent low-temperature, unlubricated wear resistance. Also of interest, is the potential for in-space manufacturing of metal alloys and the use of microgravity to determine fundamental thermophysical properties to inform ground-based modeling and experimentation. In this work, a Zr-based bulk metallic glass was processed in the electromagnetic levitator ISS-EML to determine undercooling, electrical resistivity, specific heat capacity, surface tension, and viscosity. A 6.5 mm sphere was vitrified during the processing, resulting in the first bulk metallic glass manufactured on board the international space station (ISS).

scholarly journals Tension-Tension Fatigue Behavior of High-Toughness Zr61Ti2Cu25Al12 Bulk Metallic Glass

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2815
Author(s):  
Yu Hang Yang ◽  
Jun Yi ◽  
Na Yang ◽  
Wen Liang ◽  
Hao Ran Huang ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Shear Band ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Fatigue Resistance ◽  
Metallic Glasses ◽  
Stress Amplitude ◽  
Fatigue Behavior ◽  
Bulk Metallic Glasses ◽  
High Toughness

Bulk metallic glasses have application potential in engineering structures due to their exceptional strength and fracture toughness. Their fatigue resistance is very important for the application as well. We report the tension-tension fatigue damage behavior of a Zr61Ti2Cu25Al12 bulk metallic glass, which has the highest fracture toughness among BMGs. The Zr61Ti2Cu25Al12 glass exhibits a tension-tension fatigue endurance limit of 195 MPa, which is higher than that of high-toughness steels. The fracture morphology of the specimens depends on the applied stress amplitude. We found flocks of shear bands, which were perpendicular to the loading direction, on the surface of the fatigue test specimens with stress amplitude higher than the fatigue limit of the glass. The fatigue cracking of the glass initiated from a shear band in a shear band flock. Our work demonstrated that the Zr61Ti2Cu25Al12 glass is a competitive structural material and shed light on improving the fatigue resistance of bulk metallic glasses.

scholarly journals Thermophysical properties of a Cu46Zr42Al7Y5 bulk metallic glass-forming liquid

2006 ◽  
Vol 88 (22) ◽  
pp. 221909 ◽  
Author(s):  
G. J. Fan ◽  
J. J. Z. Li ◽  
Won-Kyu Rhim ◽  
D. C. Qiao ◽  
H. Choo ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Thermophysical Properties ◽  
Glass Forming

Cluster-Based Bulk Metallic Glass Formation in Co (-Fe)-Si-B-Nb Alloy Systems

2007 ◽  
Vol 561-565 ◽  
pp. 1275-1278 ◽  
Author(s):  
Qing Wang ◽  
Chun Lei Zhu ◽  
Yan Hui Li ◽  
Jiang Wu ◽  
Chuang Dong ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Metallic Glasses ◽  
Glass Formation ◽  
Bulk Metallic Glasses ◽  
Ternary Alloys ◽  
Glass Forming ◽  
Binary Clusters ◽  
Composition Formula ◽  
Alloy Systems

The present paper investigates the bulk metallic glass formation in Co-based alloy systems with the guidance of the cluster line and minor-alloying principles. The selected basic ternary Co-B-Si alloy compositions are intersecting points of cluster lines, defined by linking special binary clusters to the third element. Then these basic ternary alloys are further minor-alloyed with Nb and quaternary bulk metallic glasses are obtained only by 4-5 at. % Nb minor-alloying of the basic composition Co68.6B25.7Si5.7 that is developed from dense-packed cluster Co8B3. The bulk metallic glasses are expressed approximately with a unified simple composition formula: (Co8B3)1(Si,Nb)1. In addition, a quantity of Fe substitution for Co further improves the glass-forming abilities.

Co-Based Bulk Metallic Glasses with Good Soft-Magnetic Properties and High Strength

2017 ◽  
Vol 898 ◽  
pp. 703-708 ◽  
Author(s):  
Qi Kui Man ◽  
Ya Qiang Dong ◽  
Chun Tao Chang ◽  
Xin Min Wang ◽  
Run Wei Li
Keyword(s):  
Magnetic Properties ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Eutectic Point ◽  
Glass Forming Ability ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Glass Forming

The thermal stability, glass-forming ability, soft-magnetic properties and mechanical properties of Co46Fe19+xB22.5Si5.5Nb7–x (x=0–2) bulk metallic glasses were investigated. The 5.5 at% Nb addition was found to be effective in approaching alloy to a eutectic point, resulting in an increase in glass-forming ability. By copper mold casting, bulk metallic glass rods with diameters up to 5 mm were produced. Except for high glass-forming ability, the bulk metallic glasses also exhibit good soft-magnetic properties, i.e., low coercive force of 1.34–2.14 A/m, high effective permeability at 1 kHz of 2.26–3.06×104, and high fractures strength (σf) of 4010–4460 MPa. This Co-based bulk metallic glass system with high strengths and excellent soft-magnetic properties is promising for future applications as a new functional material.

Free Volume Evolution in Bulk Metallic Glass during High Temperature Creep

2002 ◽  
Vol 754 ◽  
Author(s):  
B. S. Sundar Daniel ◽  
Martin Heilmaier ◽  
Birgit Bartusch ◽  
Jörn Kanzow ◽  
Katja Günther-Schade ◽  
...  
Keyword(s):  
Glass Transition ◽  
Plastic Strain ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Free Volume ◽  
Metallic Glasses ◽  
Constant Strain Rate ◽  
Dsc Analysis ◽  
Scanning Calorimetry ◽  
Positron Lifetime Spectroscopy

ABSTRACTMetallic glasses lack long-range translational symmetry and have excess volume trapped within their amorphous structure, which has a direct bearing on their physical properties including deformation characteristics. Moreover, the trapped excess free volume is directly correlated to the defect concentration facilitating the possibility to model the temperature and time dependence of the free volume changes during creep as a trade off between defect generation and annihilation. Using differential scanning calorimetry (DSC) analysis the residual free volume of a metallic glass can be characterised based on the glass transition peak height (Δcp). In the present work constant strain rate tests were carried out at the ‘onset’ (Tgon = 685 K) and ‘point of inflection’ (Tgp = 705 K) of the calorimetric glass transition to study the time dependent flow behaviour in Zr55Cu30Al10Ni5 bulk metallic glass. Modelling based on DSC analysis and positron lifetime spectroscopy on samples creep deformed to different plastic strain values corroborate the stress decrease after the peak stress (‘stress overshoot’) occurring in bulk metallic glasses with increasing plastic strain to be associated with a small increase in free volume.

Dependence of Modulus and Hardness on the Annealing Conditions of Pt57.5Cu14.7Ni5.3P22.5 Bulk Metallic Glass

MRS Advances ◽  
2019 ◽  
Vol 4 (2) ◽  
pp. 73-79 ◽  
Author(s):  
Zheng Chen ◽  
Amit Datye ◽  
P. Aidan Brooks ◽  
Madison Sprole ◽  
Jittisa Ketkaew ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Metallic Glasses ◽  
Fictive Temperature ◽  
Amorphous Phases ◽  
Annealing Conditions ◽  
Different Temperatures ◽  
Degree Of Crystallization

ABSTRACTThe mechanical properties of metallic glasses are often tuned by annealing, which influences these properties by adjusting the relaxation and/or crystallization status of the glasses. Here, we studied the hardness and modulus of Pt57.5Cu14.7Ni5.3P22.5 bulk metallic glass annealed at different temperatures by nanoindentation, where the annealing gives the material different fictive temperatures and fractions of crystallization. It is found that both reducing the fictive temperature of a fully amorphous sample and increasing the degree of crystallization in a partially crystallized sample increase hardness and modulus. Combining the two approaches, elevated hardness and modulus values are found for composite materials containing both crystalline and amorphous phases when they are compared to chemically identical alloys featuring similar percentages of crystalline and amorphous phases that have been prepared by annealing at higher temperatures. Our findings indicate that the mechanical properties of the platinum-based alloys can be customized by processing them with targeted heat treatments.

Effect of Residual Stress on Mechanical Property of Monolithic Bulk Metallic Glass

2010 ◽  
Vol 654-656 ◽  
pp. 1050-1053
Author(s):  
Min Ha Lee ◽  
Joong Hwan Jun ◽  
Jürgen Eckert
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Metallic Glass ◽  
Cold Rolling ◽  
Bulk Metallic Glass ◽  
Metallic Glasses ◽  
Metallic Materials ◽  
Cyclic Compression ◽  
Stress States ◽  
Intrinsic Plasticity

Mechanical treatments such as deep rolling are known to affect the strength and toughness of metallic glass due to the residual stress. It is well known that compressive residual stress states usually enhance the mechanical properties in conventional metallic materials. We present investigations on the change of fracture behavior related with mechanical properties of “brittle” bulk metallic glass by cold rolling at room temperature. Improvement of the intrinsic plasticity is observed not only after constrained cyclic compression but also after cold rolling. Moreover, neither nanocrystallization nor phase separation occurs during deformation. By these findings we provide a unique fundamental basis by considering the introduction of structural inhomogeneity and ductility improvement in metallic glasses. The experimental evidence clearly supports that such an inhomogeneous glassy can be produced by residual stress in well known “brittle” bulk metallic glasses, and does not depend on a specific pinpointed chemical composition.

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