Effect of spherical indenter radius and loading rate on the kinetic nanoindentation creep behavior of La-based metallic glasses

2020 ◽  
Vol 128 (16) ◽  
pp. 165108
Author(s):  
K. Sun ◽  
N. Z. Zhang ◽  
Y. Zhang ◽  
Q. Wang ◽  
S. T. Zhang ◽  
...  
Keyword(s):  
Creep Behavior ◽  
Metallic Glasses ◽  
Loading Rate ◽  
Spherical Indenter

Serrated Plastic Flow of Various Metallic Glasses during Nanoindentation

2016 ◽  
Vol 368 ◽  
pp. 3-6
Author(s):  
Mária Huráková ◽  
Kornel Csach ◽  
Jozef Miškuf ◽  
Alena Juríková ◽  
Štefan Demčák ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Plastic Flow ◽  
Metallic Glasses ◽  
Alloy Composition ◽  
Loading Rate ◽  
Glass Forming Ability ◽  
Loading Rates ◽  
Glass Forming ◽  
Wide Range ◽  
The Individual

Nanoindentation experiments were executed on amorphous metallic ribbons made of Fe40Ni40B20, Cu47Ti35Zr11Ni6Si1 and Zr65Cu17.5Ni10Al7.5 that differ in microhardness and glass forming ability. The individual serrated plastic flow events were analyzed in a wide range of the loading rates. In the individual pop-in events of the load-displacement (P-h) curve the contributions of plastic deformation (Δhpl) were calculated depending on the loading rate and the alloy composition. It is concluded that the contribution of the serrated plastic deformation flow varies with the composition of the alloy. The highest plastic deformation for the individual pop-ins was observed for Zr-based metallic glasses.

scholarly journals Plastic Dynamical Model for Bulk Metallic Glasses

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Shaowen Yao ◽  
Zhibo Cheng
Keyword(s):  
Metallic Glasses ◽  
Loading Rate ◽  
Testing Machine ◽  
Compressive Loading ◽  
Shear Bands ◽  
Bulk Metallic Glasses ◽  
Experimental Results ◽  
Dynamical Model ◽  
Compression Tests ◽  
Rate Range

Based on previous experimental results of the plastic dynamic analysis of metallic glasses upon compressive loading, a dynamical model is proposed. This model includes the sliding speed of shear bands in the plastically strained metallic glasses, the shear resistance of shear bands, the internal friction resulting from plastic deformation, and the influences from the testing machine. This model analysis quantitatively predicts that the loading rate can influence the transition of the plastic dynamics in metallic glasses from chaotic (low loading rate range) to stable behavior (high loading rate range), which is consistent with the previous experimental results on the compression tests of a Cu50Zr45Ti5 metallic glass. Moreover, we investigate the existence of a nonconstant periodic solution for plastic dynamical model of bulk metallic glasses by using Manásevich–Mawhin continuation theorem.

Nanoindentation Study of the Influence of the Loading Rate on the Deformation of Metallic Glasses

2015 ◽  
Vol 662 ◽  
pp. 23-26 ◽  
Author(s):  
Maria Hurakova ◽  
Kornel Csach ◽  
Alena Juríková ◽  
Jozef Miškuf ◽  
Stefan Demcak ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Metallic Glasses ◽  
Loading Rate ◽  
Loading Rates ◽  
Load Displacement

Nanoindentation experiments at the loading rates from 0.05 to 100 mN.s-1 on the amorphous FeNiB alloy were executed. We found that the serrations in the load-displacement (P-h) curve are more pronounced at lower loading rates and gradually disappear upon increasing loading rate. We have estimated the contribution of the inhomogeneous plastic deformation from pop-in events on the P-h curves. The pop-in population was compared with the morphology of indents.

scholarly journals Indentation Creep Behavior in Ce-Based Bulk Metallic Glasses at Room Temperature

2005 ◽  
Vol 46 (12) ◽  
pp. 2959-2962 ◽  
Author(s):  
Bingchen Wei ◽  
Taihua Zhang ◽  
Weihuo Li ◽  
Dongmei Xing ◽  
Lingchen Zhang ◽  
...  
Keyword(s):  
Creep Behavior ◽  
Metallic Glasses ◽  
Room Temperature ◽  
Bulk Metallic Glasses ◽  
Indentation Creep

Effect of loading rate on crystallization of metallic glass supercooled liquids

2020 ◽  
Vol 1 (3) ◽  
pp. 18-21
Author(s):  
E. Davoodi ◽  
M. Hasan ◽  
S. Rana ◽  
G. Kumar
Keyword(s):  
Metallic Glass ◽  
Metallic Glasses ◽  
Liquid State ◽  
Loading Rate ◽  
Supercooled Liquid ◽  
Supercooled Liquids ◽  
Onset Temperature ◽  
Crystallization Time ◽  
Processing Temperature ◽  
Supercooled Liquid State

Metallic glasses exhibit unique thermoplastic processing capability, which is enabled by their metastable supercooled liquid state below the crystallization temperature. The thermoplastic processing critically depends on the crystallization time (processing time window), temperature (viscosity), applied load, and strain-rate. Among these parameters, the effects of crystallization time and processing temperature have been extensively studied. However, the effects of load and loading rate have not been thoroughly investigated. In this work, we performed a systematic study of load on the supercooled liquid state of three metallic glass formers: Pt-based, Zr-based, and Pd-based. The results show that the load-response of a metallic glass supercooled liquids is strongly composition dependent. The onset temperature of crystallization decreases with increasing load in Pt-based metallic glass whereas for Zr-based and Pd-based metallic glasses the onset temperature remains unchanged. The crystallization peak time is reduced for all three metallic glasses after thermoplastic forming. The results are discussed in terms of nucleation and growth of crystallites in metallic glasses.

Room Temperature Creep Behavior and its Effect on Tensile Properties of CP-Ti

2017 ◽  
Author(s):  
Le Chang ◽  
Changyu Zhou ◽  
Xiaohua He
Keyword(s):  
Tensile Properties ◽  
Creep Strain ◽  
Creep Behavior ◽  
Room Temperature ◽  
Loading Rate ◽  
Temperature Creep ◽  
Creep Stress ◽  
Room Temperature Creep ◽  
Stress Dependent ◽  
Cp Ti

Commercial pure titanium (CP-Ti) is an attractive material, due to its good properties such as high strength, high specific work hardening ability, excellent plasticity, toughness, corrosion resistance and weld ability. It is commonly used in pressure vessels, such as heat exchangers, pumps, valves and so on. It has been reported that the room temperature creep has a great influence on the failure of titanium pressure vessel. In this paper, in order to investigate room temperature creep behavior and its effect on tensile properties of CP-Ti, both creep and tensile experiments were carried out. According to creep experiment results, CP-Ti shows strong stress dependent creep behavior at the creep stress higher than 305MPa. On the contrary, the strong loading rate dependent creep behavior occurs at the creep stress lower than 305MPa. Besides, creep strain of CP-Ti can be reduced by pretension. As pretension reaches 6%, creep behavior of CP-Ti is completely suppressed at the creep stress of 320MPa. Subsequent tensile test results show that the occurrence of room temperature creep obviously enhances the strength of CP-Ti. With the increase of creep strain and loading rate in previous creep tests, the yield strength and tensile strength of CP-Ti increase.

scholarly journals Rate-dependent inhomogeneous creep behavior in metallic glasses

2021 ◽  
Vol 31 (6) ◽  
pp. 1758-1765
Author(s):  
Hong WU ◽  
Feng XU ◽  
Jun-ye REN ◽  
Xiao-dong LAN ◽  
Yong YIN ◽  
...  
Keyword(s):  
Creep Behavior ◽  
Metallic Glasses ◽  
Rate Dependent
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