scholarly journals Effect of Intermittent Ultrasonic Vibration-Assisted Compression on the Mechanical Properties of Zr-Based Amorphous Alloys

2021 ◽  
Vol 8 ◽  
Author(s):  
Yang Lingyun ◽  
Xu Shenpeng ◽  
Lou Yan
Keyword(s):  
Mechanical Properties ◽  
Shear Zone ◽  
Free Volume ◽  
Ultrasonic Vibration ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
High Ductility ◽  
Bulk Amorphous Alloys ◽  
Vibration Stress ◽  
Design Experiments

Bulk amorphous alloys have some good mechanical properties due to their special atomic arrangement and are now popular in the field of materials. Zr-based amorphous alloys have good mechanical properties, but they are different from lattice slip materials with high ductility. When these materials are compressed and deformed, it generates a concentrated elastic force in the shear zone that causes instantaneous amorphous fracture. The extremely poor plasticity of Zr-based amorphous materials highlight their shortcomings and make them difficult to use in engineering applications. In this paper, it is found that the plasticity of Zr-based amorphous alloys is enhanced to a certain extent by intermittent ultrasonic vibration-assisted compression (IUVC). The ultrasonic vibration stress of IUVC can increase the extra free volume of Zr-based amorphous alloys and increase their degree of “rejuvenation”, which is manifested as an increase in plasticity. To explore how IUVC affects the plasticity of Zr-based amorphous alloys, we design experiments to analyse the effects of different intermittent times, pre-pressures and ultrasonic amplitudes on the plasticity of amorphous alloys.

Synthesis and mechanical properties of Zr-based bulk amorphous alloys

2008 ◽  
Vol 354 (28) ◽  
pp. 3291-3298 ◽  
Author(s):  
M. Iqbal ◽  
J.I. Akhter ◽  
H.F. Zhang ◽  
Z.Q. Hu
Keyword(s):  
Mechanical Properties ◽  
Amorphous Alloys ◽  
Bulk Amorphous Alloys

Mechanical Properties of La-based Bulk Amorphous Alloys and Composites

2002 ◽  
Vol 754 ◽  
Author(s):  
M.L. Lee ◽  
Y. Li ◽  
W.C. Carter
Keyword(s):  
Mechanical Properties ◽  
Fracture Energy ◽  
Amorphous Alloys ◽  
High Volume ◽  
Intermetallic Phases ◽  
Impact Fracture ◽  
Crystalline Phases ◽  
Bulk Amorphous Alloys ◽  
Glassy Metals ◽  
The Impact

ABSTRACTThe influence of different microstructures of La-based fully amorphous samples and its composites on the impact fracture energy were investigated and discussed. Results showed improvement in fracture energy of glassy metals with intermetallic phases, but deteriorated in the presence of dendrite phases and high volume % of crystalline phases.

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.

Influence of Y and Nb Addition on Crystallization Behavior and Mechanical Properties of Zr-Ni-Al-Cu-M Bulk Amorphous Alloys

2011 ◽  
Vol 326 ◽  
pp. 11-18 ◽  
Author(s):  
Muhammad Iqbal ◽  
Javed Iqbal Akhter
Keyword(s):  
Mechanical Properties ◽  
Activation Energy ◽  
Amorphous Alloys ◽  
Crystallization Behavior ◽  
Liquid Region ◽  
Mechanical And Thermal Properties ◽  
Bulk Amorphous Alloys ◽  
Wide Range ◽  
Stage Crystallization ◽  
Nb Addition

Bulk amorphous alloys are new class of materials with excellent mechanical and thermal properties. Bulk metallic glasses (BMGs) have wide range of application such as structural materials. Minor alloying additions play beneficial role in the production and properties of BMGs. The present study was conducted to investigate the effect of Y and Nb addition on activation energy, crystallization behavior, thermal and mechanical properties of Zr64.5Ni15.5Al11.5Cu8.5. Bulk amorphous ingots and sheets of three [Zr0.645Ni0.155Al0.115Cu0.085]100-xM2 (M = Y and Nb and x = 0, 2 at. %) alloys were produced by Cu mold casting technique. The alloys were characterized by XRD, DSC, SEM, FESEM and EDS. Activation energies were calculated. The alloy containing Y shows single stage crystallization while Nb addition shows double stage crystallization. The maximum activation energy calculated is 300 kJ/mol. Parameters describing thermal stability in these systems were determined from DSC data which improved as a result of these additives. Reduced glass transition temperature Trg and thermal parameters like g, d and b were improved by Y addition. The supercooled liquid region varies between 87-100 K. Hardness and elastic moduli were also improved. It was concluded that Y and Nb addition has beneficial effect on mechanical properties. Three phases NiZr2 and CuZr2 and Cu10Zr7 were identified by XRD and confirmed by EDS in the samples annealed at 823 K while the AlNiY ternary phase was detected in the alloy containing Y.

Excess free volume and mechanical properties of amorphous alloys

1998 ◽  
Vol 40 (1) ◽  
pp. 74-78 ◽  
Author(s):  
V. I. Betekhtin ◽  
A. G. Kadomtsev ◽  
A. Yu. Kipyatkova ◽  
A. M. Glezer
Keyword(s):  
Mechanical Properties ◽  
Free Volume ◽  
Amorphous Alloys ◽  
Excess Free Volume
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