scholarly journals Relaxation of Free Volume in Zr50Cu40Al10 Bulk Metallic Glasses Studied by Positron Annihilation Measurements

2008 ◽  
Vol 49 (9) ◽  
pp. 1975-1978 ◽  
Author(s):  
Akito Ishii ◽  
Fuminobu Hori ◽  
Akihiro Iwase ◽  
Yuka Fukumoto ◽  
Yoshihiko Yokoyama ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses

Characteristic free volume change of bulk metallic glasses

2012 ◽  
Vol 111 (8) ◽  
pp. 083523 ◽  
Author(s):  
Qiang Hu ◽  
Xie-Rong Zeng ◽  
M. W. Fu
Keyword(s):  
Free Volume ◽  
Volume Change ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses

Characterization of free volume in cold-rolled Zr55Cu30Ni5Al10 bulk metallic glasses

2013 ◽  
Vol 61 (9) ◽  
pp. 3224-3232 ◽  
Author(s):  
O. Haruyama ◽  
K. Kisara ◽  
A. Yamashita ◽  
K. Kogure ◽  
Y. Yokoyama ◽  
...  
Keyword(s):  
Free Volume ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Cold Rolled

scholarly journals Rejuvenation of Zr-Based Bulk Metallic Glasses by Ultrasonic Vibration-Assisted Elastic Deformation

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4397
Author(s):  
Yan Lou ◽  
Shenpeng Xv ◽  
Zhiyuan Liu ◽  
Jiang Ma
Keyword(s):  
Amorphous Alloy ◽  
Free Volume ◽  
Elastic Deformation ◽  
Ultrasonic Vibration ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Supercooled Liquid ◽  
Deformation Region ◽  
Vibration Stress ◽  
The Relationship

The rejuvenation of Zr52.5Cu17.9Ni14.6Al10Ti5 bulk metallic glasses (BMGs) by ultrasonic vibration-assisted elastic deformation (UVEF) was studied herein. The UVEF-treated samples demonstrate an obvious rejuvenation and have a higher relaxation enthalpy and a smaller range of supercooled liquid regions than the as-cast samples. The fracture of the rejuvenated amorphous alloy is mainly ductile fracture, and shear deformation occurs in the deformation region. It is also found that as the amplitude increases, the free volume of the rejuvenated amorphous alloy increases, the yield strength and the elastic modulus decrease, and the formability increases. The free-volume content is used to characterize the degree of rejuvenation, and a mathematical model of the relationship between the ultrasonic amplitude and free volume is established. In addition, it is found that the ultrasonic vibration stress induces the additional free volume in the Zr-based bulk metallic glasses and improves the plasticizing behavior. The temperature rise caused by the ultrasonic thermal effect does not induce additional free volume.

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