Continuum mechanics characterization of plastic deformation-induced oxide film rupture

1999 ◽  
Vol 79 (10) ◽  
pp. 2313-2338 ◽  
Author(s):  
D. G. Kolman ◽  
J. R. Scully
Keyword(s):  
Plastic Deformation ◽  
Oxide Film ◽  
Continuum Mechanics ◽  
Film Rupture

Nanoindentation Characterization of Single-Crystal Silicon With Oxide Film

2021 ◽  
Author(s):  
Lianmin Yin ◽  
Yifan Dai ◽  
Hao Hu
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Oxide Film ◽  
Single Crystal ◽  
Deformation Zone ◽  
Single Crystal Silicon ◽  
Plastic Deformation Zone ◽  
Crystal Silicon ◽  
Ultra Precision

Abstract In order to obtain ultra-smooth surfaces of single-crystal silicon in ultra-precision machining, an accurate study of the deformation mechanism, mechanical properties, and the effect of oxide film under load is required. The mechanical properties of single-crystal silicon and the phase transition after nanoindentation experiments are investigated by nanoindentation and Raman spectroscopy, respectively. It is found that pop-in events appear in the theoretical elastic domain of single-crystal silicon due to the presence of oxide films, which directly leads the single crystal silicon from the elastic deformation zone into the plastic deformation zone. In addition, the mechanical properties of single-crystal silicon are more accurately measured after it has entered the full plastic deformation.

Chemical and Crystal Characterization of the Oxide Film Formed in 304L SS Under Autoclave Conditions, With and Without Crevice Formation

2015 ◽  
Vol 1769 ◽  
Author(s):  
Ángeles Díaz Sánchez ◽  
Aida Contreras Ramírez ◽  
Carlos Arganis Juárez
Keyword(s):  
Oxide Film ◽  
Nuclear Industry ◽  
Film Rupture ◽  
Active Dissolution ◽  
Dissolution Model ◽  
Mechanism And Kinetics ◽  
The Difference ◽  
Crystal Characterization ◽  
Kinetics Of

ABSTRACTThe principles of Stress Corrosion Cracking (SCC) are supported in the behavior of the oxide film formed into a crack; in fact the active dissolution of metal atoms after a film rupture and until fill repassivation is the base of slip dissolution model which is a good model to justified the crack tip advance in stainless steels (SS) used in vessel internal components for the nuclear industry. This paper shows the analyzed made at the oxide film formed on samples of 304L SS sensitized and non sensitized, under autoclave conditions (288°C, 8MPa) with and without crevice geometric formation, using SEM, XRD and Raman Spectra.The crevice and no crevice condition allow establish the difference of an oxide formed on a free surface (no crevice) and the oxide formed on the wall in a crack (crevice); the chemical and physical properties of oxide film can alter the mechanism and kinetics of SCC process, so the difference between these two conditions will give more information about the behavior of the oxide film.

Construction of plastic contact deformation maps on ceramics: a case study on aluminum nitride

1996 ◽  
Vol 54 ◽  
pp. 636-637
Author(s):  
D. L. Callahan
Keyword(s):  
Plastic Deformation ◽  
Aluminum Nitride ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Bright Field Image ◽  
Perfectly Plastic ◽  
Contrast Analysis ◽  
Deformation Patterns

Modern polishing, precision machining and microindentation techniques allow the processing and mechanical characterization of ceramics at nanometric scales and within entirely plastic deformation regimes. The mechanical response of most ceramics to such highly constrained contact is not predictable from macroscopic properties and the microstructural deformation patterns have proven difficult to characterize by the application of any individual technique. In this study, TEM techniques of contrast analysis and CBED are combined with stereographic analysis to construct a three-dimensional microstructure deformation map of the surface of a perfectly plastic microindentation on macroscopically brittle aluminum nitride.The bright field image in Figure 1 shows a lg Vickers microindentation contained within a single AlN grain far from any boundaries. High densities of dislocations are evident, particularly near facet edges but are not individually resolvable. The prominent bend contours also indicate the severity of plastic deformation. Figure 2 is a selected area diffraction pattern covering the entire indentation area.

scholarly journals Material Geometry of Binary Composites

Symmetry ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 892
Author(s):  
Marcelo Epstein
Keyword(s):  
Continuum Mechanics ◽  
Mathematical Framework ◽  
Double Groupoid ◽  
The Individual ◽  
Elastic Composites

The constitutive characterization of the uniformity and homogeneity of binary elastic composites is presented in terms of a combination of the material groupoids of the individual constituents. The incorporation of these two groupoids within a single double groupoid is proposed as a viable mathematical framework for a unified formulation of this and similar kinds of problems in continuum mechanics.

Magnetic Characterization of SUS316L Deformed by High Pressure Torsion

2011 ◽  
Vol 239-242 ◽  
pp. 1300-1303
Author(s):  
Hong Cai Wang ◽  
Minoru Umemoto ◽  
Innocent Shuro ◽  
Yoshikazu Todaka ◽  
Ho Hung Kuo
Keyword(s):  
Plastic Deformation ◽  
High Pressure ◽  
Stainless Steel ◽  
Phase Transformation ◽  
Austenitic Stainless Steel ◽  
Volume Fraction ◽  
High Pressure Torsion ◽  
Austenitic Matrix ◽  
Magnetic Characterization

SUS316L austenitic stainless steel was subjected to severe plastic deformation (SPD) by the method of high pressure torsion (HPT). From a fully austenitic matrix (γ), HPT resulted in phase transformation from g®a¢. The largest volume fraction of 70% a¢ was obtained at 0.2 revolutions per minute (rpm) while was limited to 3% at 5rpm. Pre-straining of g by HPT at 5rpm decreases the volume fraction of a¢ obtained by HPT at 0.2rpm. By HPT at 5rpm, a¢®g reverse transformation was observed for a¢ produced by HPT at 0.2rpm.

scholarly journals Characterization of an Amorphous Titanium Oxide Film Deposited onto a Nano-Textured Fluorination Surface

Materials ◽  
2016 ◽  
Vol 9 (6) ◽  
pp. 429 ◽  
Author(s):  
Pei-Yu Li ◽  
Hua-Wen Liu ◽  
Tai-Hong Chen ◽  
Chun-Hao Chang ◽  
Yi-Shan Lu ◽  
...  
Keyword(s):  
Oxide Film ◽  
Titanium Oxide ◽  
Titanium Oxide Film

Characterization of Adhesion Properties by Delamination of Ceramic-Metal Interfaces in Four Point Bending

2018 ◽  
Vol 774 ◽  
pp. 66-71 ◽  
Author(s):  
Martin Lederer ◽  
Agnieszka Betzwar Kotas ◽  
Golta Khatibi ◽  
Herbert Danninger
Keyword(s):  
Plastic Deformation ◽  
Energy Consumption ◽  
Stress Intensity ◽  
Theoretical Interpretation ◽  
Adhesion Properties ◽  
Fem Simulations ◽  
Four Point Bending ◽  
Metal Interfaces ◽  
Stress Invariant

The adhesive strength of ceramic - copper interfaces was measured in four point bending using a central notch for crack initiation. According to our method, plastic deformation may occur during the delamination process. FEM simulations were employed in order to separate elastic and plastic contributions to the energy consumption of the experiment. In conclusion, a novel delamination criterion based on the stress intensity at the crack tip was established. Here, the stress invariant J3is used as indicator for delamination of the interface. Agreement between experiments and theoretical interpretation is demonstrated for copper layers directly bonded to aluminum oxide.

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