Rate dependence of serrated flow in a metallic glass

2003 ◽  
Vol 18 (4) ◽  
pp. 755-757 ◽  
Author(s):  
W. H. Jiang ◽  
M. Atzmon
Keyword(s):  
Plastic Deformation ◽  
Atomic Force Microscopy ◽  
Loading Rate ◽  
Shear Bands ◽  
Shear Band Formation ◽  
Band Formation ◽  
Serrated Flow ◽  
Force Microscopy ◽  
Loading Rates ◽  
Atomic Force

Plastic deformation of amorphous Al90Fe5Gd5 was investigated using nanoindentation and atomic force microscopy. While serrated flow was detected only at high loading rates, shear bands were observed for all loading rates, ranging from 1 to 100 nm/s. However, the details of shear-band formation depend on the loading rate.

Chemisorptive electron emission and atomic force microscopy as probes of plastic deformation during fracture at a metal/glass interface

1995 ◽  
Vol 10 (8) ◽  
pp. 2033-2041 ◽  
Author(s):  
Sumio Nakahara ◽  
S.C. Langford ◽  
J.T. Dickinson
Keyword(s):  
Plastic Deformation ◽  
Atomic Force Microscopy ◽  
Electron Emission ◽  
Metallic Phase ◽  
Ductile Deformation ◽  
Strongly Correlated ◽  
Force Microscopy ◽  
Atomic Force ◽  
Glass Interface ◽  
Reactive Gas

We examine the use of chemisorptive emission (electron emission accompanying the adsorption of a reactive gas on a metal surface) and atomic force microscopy as measures of plastic deformation during fracture along a metallic Mg/glass interface. Localized ductile deformation in the metallic phase enhances the fracture energy, exposes metallic Mg to the reactive O2 atmosphere, and produces intense emissions. The number of electrons emitted following fracture in low-pressure oxygen atmospheres is strongly correlated with the total energy expended during failure (peel energy). The presence of localized ductile deformation is verified by atomic force microscopy (AFM): voids are observed on surfaces yielding significant cmissions and enhanced fracture energies. These voids are not observed on samples yielding the lowest peel energies and emission intensities, i.e., where the contribution of deformation to the peel energy is negligible. Quantitative use of roughness data derived from the AFM images is, however, problematic. The potential for chemisorptive electron emission as a probe of deformation along interfaces involving Mg, Ti, Zr, and Al is promising.

scholarly journals Atomic force microscopy study of nanoindentation deformation and indentation size effect in MgO crystals

1999 ◽  
Vol 14 (10) ◽  
pp. 3973-3982 ◽  
Author(s):  
K. Sangwal ◽  
P. Gorostiza ◽  
J. Servat ◽  
F. Sanz
Keyword(s):  
Experimental Data ◽  
Plastic Deformation ◽  
Atomic Force Microscopy ◽  
Size Effect ◽  
Deformation Zone ◽  
Indentation Size Effect ◽  
Indentation Size ◽  
Depth Of Penetration ◽  
Force Microscopy ◽  
Atomic Force

The dependences of various nanoindentation parameters, such as depth of penetration d, indentation diameter a, deformation zone radius R, and height h of hills piled up around indents, on applied load were investigated for the initial (unrecovered) stage of indentation of the (100) cleavage faces of MgO crystals by square pyramidal Si tips for loads up to 10 μN using atomic force microscopy. The experimental data are analyzed using theories of elastic and plastic deformation. The results revealed that (i) a, R, and h linearly increase with d; (ii) the development of indentation size and deformation zone and the formation of hills are two different processes; (iii) the load dependence of nanohardness shows the normal indentation size effect (i.e., the hardness increases with a decrease in load); and (iv) there is an absence of plastic deformation involving the formation of slip lines around the indentations. It is found that Johnson's cavity model of elastic–plastic boundary satisfactorily explains the experimental data. The formation of hills around indentations is also consistent with a new model (i.e., indentation crater model) based on the concept of piling up of material of indentation cavity as hills.

Loading-Rate Dependence of Individual Ligand−Receptor Bond-Rupture Forces Studied by Atomic Force Microscopy

Langmuir ◽  
2001 ◽  
Vol 17 (12) ◽  
pp. 3741-3748 ◽  
Author(s):  
Yu-Shiu Lo ◽  
Ying-Jie Zhu ◽  
Thomas P. Beebe
Keyword(s):  
Atomic Force Microscopy ◽  
Loading Rate ◽  
Rate Dependence ◽  
Bond Rupture ◽  
Force Microscopy ◽  
Atomic Force

scholarly journals Plastic Deformation Quantified by Atomic Force Microscopy Measurements for Duplex Stainless Steel under Monotonic and Cyclic Loading

2008 ◽  
Vol 13-14 ◽  
pp. 163-172 ◽  
Author(s):  
Ingrid Serre ◽  
Daniel Salazar ◽  
Jean Bernard Vogt
Keyword(s):  
Plastic Deformation ◽  
Atomic Force Microscopy ◽  
Stainless Steels ◽  
Monotonic Loading ◽  
Cyclic Plasticity ◽  
Force Microscopy ◽  
Atomic Force ◽  
Slip Bands ◽  
Nucleation Sites ◽  
Cyclic Plastic Deformation

By atomic force microscopy, the plastic deformation marks resulting from monotonic and cyclic plastic deformation were analysed to study the plasticity in each phase of Duplex Stainless Steels. In austenite, straight slip bands were observed after monotonic loading. These straight slip bands seem to serve as fatigue extrusion nucleation sites, which are the marks of the accommodation of the cyclic plasticity by the austenite. In ferrite, after monotonic loading, slip bands, could be classified into two different groups depending on whether they result from the bulk activities of ferrite or whether their formation is assisted by the plastic deformation of austenite. It was found that the crystallographic misorientation based on a Kurdjomov-Sachs relationship is the factor controlling one or the other type. After the first 5 loading cycles, the ferrite presents only monotonic plastic marks. This suggests no direct contribution of the ferrite to the accommodation of the cyclic plasticity.

scholarly journals Measuring biomaterials mechanics with atomic force microscopy. 1. Influence of the loading rate and applied force (pyramidal tips)

2019 ◽  
Vol 82 (9) ◽  
pp. 1392-1400 ◽  
Author(s):  
Andreas Weber ◽  
Jagoba Iturri ◽  
Rafael Benitez ◽  
José L. Toca‐Herrera
Keyword(s):  
Atomic Force Microscopy ◽  
Loading Rate ◽  
Applied Force ◽  
Force Microscopy ◽  
Atomic Force
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