scholarly journals Investigation on the serrated flow behavior of bulk metallic glasses based on machine learning

2021 ◽  
Author(s):  
Mingshenzi Zhao ◽  
Zhilin Long ◽  
Li Peng
Keyword(s):  
Machine Learning ◽  
Metallic Glasses ◽  
Flow Behavior ◽  
Bulk Metallic Glasses ◽  
Serrated Flow

Effects of Ni and Si additions on mechanical properties and serrated flow behavior in FeMoPCB bulk metallic glasses

2019 ◽  
Vol 783 ◽  
pp. 555-564 ◽  
Author(s):  
Jing Zhou ◽  
Baoan Sun ◽  
Qianqian Wang ◽  
Qiuman Yang ◽  
Weiming Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Metallic Glasses ◽  
Flow Behavior ◽  
Bulk Metallic Glasses ◽  
Serrated Flow

Deformation behaviors and mechanism of Ni–Co–Nb–Ta bulk metallic glasses with high strength and plasticity

2007 ◽  
Vol 22 (4) ◽  
pp. 869-875 ◽  
Author(s):  
Y.H. Liu ◽  
G. Wang ◽  
M.X. Pan ◽  
P. Yu ◽  
D.Q. Zhao ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Flow Behavior ◽  
Shear Bands ◽  
Bulk Metallic Glasses ◽  
High Strength ◽  
Serrated Flow ◽  
Crystalline Materials ◽  
Glass Forming ◽  
Deformation Behaviors ◽  
Strength And Plasticity

A class of Ni–Co–Nb–Ta bulk metallic glasses (BMGs) with a high glass-forming ability is developed. With proper compositional modification, the BMGs exhibit the enhanced plastic strain (up to 4%) and the ultimate strength (up to 3540 MPa). It is found that the interactions of shear bands such as intersecting, arresting, and branching, which normally are related to the plastic metallic glasses, can be observed both in the plastic and brittle Ni–Co–Nb–Ta BMGs. Obvious serrated flow behavior is observed during plastic deformation. The origins of the plasticity and the serrated flow in the Ni-based BMGs are analyzed in analogy to that in crystalline materials.

scholarly journals Temperature, Strain and Strain Rate Dependence of Serrated Flow in Bulk Metallic Glasses

2007 ◽  
Vol 48 (7) ◽  
pp. 1774-1780 ◽  
Author(s):  
Florian H. Dalla Torre ◽  
Alban Dubach ◽  
Adrienne Nelson ◽  
Jörg F. Löffler
Keyword(s):  
Strain Rate ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Rate Dependence ◽  
Strain Rate Dependence ◽  
Serrated Flow ◽  
Strain And Strain Rate ◽  
Temperature Strain

scholarly journals Depth-sensing indentation tests in studying plastic instabilities

2004 ◽  
Vol 19 (1) ◽  
pp. 31-45 ◽  
Author(s):  
N.Q. Chinh ◽  
J. Gubicza ◽  
Zs. Kovács ◽  
J. Lendvai
Keyword(s):  
Grain Size ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Solute Concentration ◽  
Metal Alloys ◽  
Depth Sensing ◽  
Serrated Flow ◽  
Indentation Tests ◽  
Grain Size And Orientation

This review surveys the phenomenon of plastic instabilities occurring in depth-sensing indentation measurements. Investigations presented focus on the characterization of Portevin–Le Châtelier type instabilities observed in different metal alloys during indentation. The effect of some important factors such as solute concentration, the formation of Guinier–Preston zones, and grain size and orientation are described and discussed. The phenomenon of plastic instabilities as serrated flow recently observed in bulk metallic glasses is also briefly reviewed.

Viscous Flow Behaviors of Supercooled Liquids of Pre-Annealed Zr55Cu30Al10Ni5 Bulk Metallic Glasses

2007 ◽  
Vol 561-565 ◽  
pp. 1271-1274 ◽  
Author(s):  
Tohru Yamasaki ◽  
S. Maeda ◽  
Takeyuki Kikuchi ◽  
Takeshi Fukami ◽  
Yokoyama Yoshihiko ◽  
...  
Keyword(s):  
Viscous Flow ◽  
Metallic Glasses ◽  
High Speed ◽  
Applied Load ◽  
Flow Behavior ◽  
Bulk Metallic Glasses ◽  
Supercooled Liquid ◽  
Supercooled Liquids ◽  
Supercooled Liquid Region ◽  
Liquid Region

Viscous flow behavior in supercooled liquid region of as-cast and pre-annealed Zr55Cu30Al10Ni5 bulk metallic glasses has been examined by using a penetration viscometer under high-speed heating rate of 20, 200 and 400 °C/min. Applied load for the cylindrical-shaped penetration indenter with a diameter of 1 mm was varied from 0.049 N to 0.294 N. Viscosity was quite independent of these applied loads. By pre-annealing the bulk metallic glasses at 400 °C, the density of the glasses increased, while the viscosity and the activation energy for viscous flow in their soopercooled liquid decreased with the pre-annealing treatments. Corresponding measurements of the differential thermal calorimetry (DSC) have been also done.

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