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.

scholarly journals Preparation and characterization of Fe-based bulk metallic glasses in plate form

2012 ◽  
Vol 407 (16) ◽  
pp. 3192-3195 ◽  
Author(s):  
G.C. Lavorato ◽  
G. Fiore ◽  
A. Castellero ◽  
M. Baricco ◽  
J.A. Moya
Keyword(s):  
Metallic Glasses ◽  
Bulk Metallic Glasses

Characterization of plastic instability steps occurring in depth-sensing indentation tests

2002 ◽  
Vol 324 (1-2) ◽  
pp. 219-224 ◽  
Author(s):  
N.Q Chinh ◽  
Gy Horváth ◽  
Zs Kovács ◽  
J Lendvai
Keyword(s):  
Plastic Instability ◽  
Depth Sensing ◽  
Indentation Tests

Characterization of bulk metallic glasses via fast differential scanning calorimetry

2014 ◽  
Vol 590 ◽  
pp. 84-90 ◽  
Author(s):  
S. Pogatscher ◽  
D. Leutenegger ◽  
A. Hagmann ◽  
P.J. Uggowitzer ◽  
J.F. Löffler
Keyword(s):  
Differential Scanning Calorimetry ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Scanning Calorimetry

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

Solute concentration dependence of strength and plastic instabilities in Al-Mg alloys

2005 ◽  
Vol 20 (2) ◽  
pp. 331-337 ◽  
Author(s):  
Gy. Horváth ◽  
N.Q. Chinh ◽  
J. Lendvai
Keyword(s):  
Dislocation Line ◽  
Solute Concentration ◽  
Mg Alloys ◽  
Dynamic Strain ◽  
Solute Content ◽  
Serrated Flow ◽  
Indentation Tests ◽  
Power Law Function ◽  
Chatelier Effect ◽  
Al Mg Alloys

Characteristics of the dynamic strain aging (DSA) in the Portevin-Le Chatelier effect are experimentally investigated by dynamic indentation tests and numerically analyzed by using literature models. Experimental results obtained on Al–Mg alloys show that the occurrence and development of the plastic instabilities—serrated indentation—depend strongly on the solute content. During dynamic microindentation tests the amplitude of microhardness drops—similarly to the global hardness—and is changing as a power law function of Mg solute content with an exponent of 2/3. It has been shown that the term describing the effect of DSA in serrated flow is not proportional but rather a power expression of the local solute concentration, Cs, on the dislocation line with the exponent of 1/2. Together with this, the kinetics of solute segregation during DSA is controlled by the pipe diffusion.

scholarly journals Corrosion of Biocompatible Mg66+xZn30-xCa4 (x=0.2) Bulk Metallic Glasses

2016 ◽  
Vol 61 (2) ◽  
pp. 807-810 ◽  
Author(s):  
R. Nowosielski ◽  
K. Cesarz-Andraczke ◽  
P. Sakiewicz ◽  
A. Maciej ◽  
A. Jakóbik-Kolon ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
X Ray Diffraction ◽  
Electrochemical Tests ◽  
Simulated Environment ◽  
Corrosion Studies ◽  
Physiological Fluid

Abstract The aim of this paper was to investigate the corrosion resistance of Mg66Zn30Ca4 and Mg68Zn28Ca4 metallic glasses and evaluate the ability of this amorphous alloy use for medical applications as biodegradable medical implants. Taking into account the amount of Mg, Zn, Ca elements dissolved in multielectrolyte physiological fluid (MPF) from Mg66+xZn30-xCa4 (x=0.2) alloys the daily dose of evolved ions from alloys components was determined. Additional goal of the paper was determination of corrosion rate (Vcorr) and amount of hydrogen evolved from amorphous magnesium alloys in simulated environment of human body fluids during 24h immersion and during electrochemical tests. Corrosion studies were done in the multielectrolyte physiological fluid (MPF) at 37°C. The amount of hydrogen evolved [ml/cm2] and corrosion rate Vcorr [mm/year] of amorphous Mg66Zn30Ca4 and Mg68Zn28Ca4 alloys were compared. The work also presents characterization of Mg-based bulk metallic glasses structure in the form of 2 mm thickness plates. Samples structure was analyzed by means of X-ray diffraction. Fracture and surface morphology of magnesium alloy samples were identified using scanning electron microscopy.

Preparation and characterization of quaternary magnetic Fe80-xCoxP14B6 bulk metallic glasses

2014 ◽  
Vol 115 (20) ◽  
pp. 204901 ◽  
Author(s):  
Haibo Ling ◽  
Qiang Li ◽  
Hongxiang Li ◽  
Jijun Zhang ◽  
Yaqiang Dong ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Bulk Metallic Glasses
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