The Effects of Annealing on Fatigue Behavior in Zr-based Bulk Metallic Glasses

2011 ◽  
Vol 1300 ◽  
Author(s):  
Peng Tong ◽  
Despina Louca ◽  
Yoshihiko Yokoyama ◽  
Anna Llobet ◽  
Gongyao Wang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Metallic Glasses ◽  
Local Structure ◽  
Structural Changes ◽  
Fatigue Behavior ◽  
Bulk Metallic Glasses ◽  
Fatigue Loading ◽  
Annealed Sample ◽  
Loading Conditions ◽  
Pair Density

ABSTRACTThe effects of annealing and fatigue on the local structure of Zr50Cu40Al10 and Zr60Cu30Al10 bulk metallic glasses (BMG) were investigated using the pair density function (PDF) analysis of synchrotron X-ray and neutron diffraction data. Our results indicate that the two compositions respond differently to annealing. The first PDF peak becomes sharper after annealing in Zr50Cu40Al10 with its intensity increasing, indicating that short-range ordering may be induced after the heat treatment. On the other hand, in Zr60Cu30Al10, the effects due to the heat treatment on the local structure are more subtle. Separately, the as-quenched and annealed alloys with the composition Zr50Cu40Al10 were subjected to fatigue loading conditions with ~ 106 compression cycles. The room temperature measurements showed changes in the local structure with fatigue especially for the annealed sample, involving the Cu-Zr correlations. Our results suggest that the physical properties of BMGs upon fatigue loading conditions may become accentuated due to the structural relaxation brought upon by annealing, leading to observable structural changes at the atomic level from fatigue.

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.

Studying fatigue behavior and Poisson's ratio of bulk-metallic glasses

2007 ◽  
Vol 15 (5-6) ◽  
pp. 663-667 ◽  
Author(s):  
G.Y. Wang ◽  
P.K. Liaw ◽  
Y. Yokoyama ◽  
A. Peker ◽  
W.H. Peter ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Poisson’S Ratio ◽  
Fatigue Behavior ◽  
Bulk Metallic Glasses ◽  
Poisson's Ratio

Structural changes and physical properties of Fe–Ni-based metallic glasses rapidly heated by pulsed electrical currents

1991 ◽  
Vol 6 (5) ◽  
pp. 1028-1034 ◽  
Author(s):  
L. Zaluski ◽  
A. Zaluska ◽  
M. Kopcewicz ◽  
R. Schulz
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Metallic Glasses ◽  
Structural Changes ◽  
Annealing Treatment ◽  
Electrical Current ◽  
Liquid Nitrogen Temperature ◽  
Alpha Phase ◽  
Thermal Spike ◽  
Electrical Currents

Fe–Ni–Si–B metallic glasses have been annealed and crystallized using short electrical current pulses. Two types of electrical heat treatment have been used. The first one is an isothermal annealing treatment using a very high initial heating rate while the second one is a thermal spike applied on an amorphous sample held at various initial temperatures. The microstructure of the alloys after heat treatment has been characterized by x-ray diffraction, transmission electron microscopy, and Mössbauer spectroscopy. The thermal and magnetic properties of the samples measured by DSC and hysteresis loop tracer have been studied after the various heat treatments and correlated with the microstructure of the alloys. The crystallization at high temperatures produces the gamma phase only, while at low temperatures, a mixture of the gamma and alpha phases (the alpha phase being predominant) is usually observed. The samples initially held at liquid nitrogen temperature and heat treated with a thermal spike remain amorphous and show improved magnetic properties (lower coercive field and higher induction at saturation) without loss of ductility.

Fatigue behavior of Zr–Ti–Ni–Cu–Be bulk-metallic glasses

2005 ◽  
Vol 13 (3-4) ◽  
pp. 429-435 ◽  
Author(s):  
G.Y. Wang ◽  
P.K. Liaw ◽  
A. Peker ◽  
B. Yang ◽  
M.L. Benson ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Fatigue Behavior ◽  
Bulk Metallic Glasses

The influence of Pd on tension–tension fatigue behavior of Zr-based bulk-metallic glasses

2010 ◽  
Vol 32 (3) ◽  
pp. 599-604 ◽  
Author(s):  
G.Y. Wang ◽  
P.K. Liaw ◽  
Y. Yokoyama ◽  
M. Freels ◽  
A. Inoue
Keyword(s):  
Metallic Glasses ◽  
Fatigue Behavior ◽  
Bulk Metallic Glasses

Bending-fatigue behavior of bulk metallic glasses and their composites

JOM ◽  
2010 ◽  
Vol 62 (4) ◽  
pp. 25-33 ◽  
Author(s):  
Gongyao Wang ◽  
Peter K. Liaw
Keyword(s):  
Metallic Glasses ◽  
Fatigue Behavior ◽  
Bulk Metallic Glasses ◽  
Bending Fatigue

Fatigue behavior and fracture morphology of Zr50Al10Cu40 and Zr50Al10Cu30Ni10 bulk-metallic glasses

2004 ◽  
Vol 12 (10-11) ◽  
pp. 1219-1227 ◽  
Author(s):  
G.Y. Wang ◽  
P.K. Liaw ◽  
W.H. Peter ◽  
B. Yang ◽  
M. Freels ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Fatigue Behavior ◽  
Bulk Metallic Glasses ◽  
Fracture Morphology
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