scholarly journals In-situ observation of bulk 3D grain evolution during plastic deformation in polycrystalline Cu

2015 ◽  
Vol 67 ◽  
pp. 217-234 ◽  
Author(s):  
Reeju Pokharel ◽  
Jonathan Lind ◽  
Shiu Fai Li ◽  
Peter Kenesei ◽  
Ricardo A. Lebensohn ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
In Situ Observation

In situ observation of stress-induced martensitic transformation and plastic deformation in TiNi alloy

1997 ◽  
Vol 238 (2) ◽  
pp. 303-308 ◽  
Author(s):  
Xiaoping Jiang ◽  
Moritaka Hida ◽  
Yoshito Takemoto ◽  
Akira Sakakibara ◽  
Hidehiro Yasuda ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Martensitic Transformation ◽  
Tini Alloy ◽  
In Situ Observation

In-situ observation of reversible twinning in U3Si

1978 ◽  
Vol 36 (1) ◽  
pp. 572-573
Author(s):  
G. Kimmel ◽  
U. Admon ◽  
A. Zangvil
Keyword(s):  
Plastic Deformation ◽  
Intermetallic Compound ◽  
Optical Metallography ◽  
External Stress ◽  
Point Of View ◽  
In Situ Observation ◽  
Martensitic Structure ◽  
Principal Stress Direction ◽  
Double Shear

The intermetallic compound U3Si has the cubic δ' structure between 765-900°C, and the tetragonal δ structure at lower temperatures. The δ' → δ transition always results in a twinned martensitic structure. Double shear causes the appearance of bands and sub-bands (1).Plastic deformation of martensitic U3Si is accompanied by detwinning, since only one of the twins is usually favorable from the point of view of the external stress. This was confirmed by optical metallography as well as by texture analysis (2).The present work describes a memory effect observed during a study of plastically deformed (⩽2%) martensitic U3Si.TEM specimens were prepared from lateral sections of standard tensile test samples. The principal stress direction was thus perpendicular to the foil.Fig. 1 shows the twinned structure of the martensite before deformation.Primary and secondary twins can be seen. The twinning systems are {101}<101> in FCT coordinates ({112}<111> in BCT coordinates). This was inferred from trace analyses.

scholarly journals Microscopic in situ observation of the plastic deformation of polybutene-1 films under simple shear

1982 ◽  
Vol 3 (1) ◽  
pp. 3-24 ◽  
Author(s):  
S. Boni ◽  
C. G'Sell ◽  
E. Weynant ◽  
J.M. Haudin
Keyword(s):  
Plastic Deformation ◽  
Simple Shear ◽  
In Situ Observation

Development of Unconventional Processing of Steels in Semi-Solid State

2016 ◽  
Vol 256 ◽  
pp. 251-256
Author(s):  
Bohuslav Mašek ◽  
David Aišman ◽  
Filip Vančura ◽  
Martin F.X. Wagner ◽  
Hana Jirková ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
High Temperature ◽  
Solid State ◽  
Severe Plastic Deformation ◽  
Rapid Solidification ◽  
Process Conditions ◽  
In Situ Observation ◽  
Semi Solid

This paper describes selected capabilities of unconventional processing of steels in semi-solid state under various process conditions and with the use of various steel chemistries for obtaining unusual structures formed by rapid solidification in combination with other procedures. This investigation involves the use of severe plastic deformation techniques (SPD) and in-situ observation of the transformation of microstructure from solid state to semi-solid state at temperatures above 1200°C using a high-temperature microscope.

In-situ observation of plastic deformation of Fe-Si bicrystals by white-beam synchrotron radiation topography

1998 ◽  
Vol 78 (1) ◽  
pp. 105-130 ◽  
Author(s):  
M. Polcarova ◽  
J. Gemperlova ◽  
J. Bradler ◽  
A. Jacques ◽  
A. George ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Synchrotron Radiation ◽  
In Situ Observation ◽  
White Beam

scholarly journals Experimental and Numerical Study on Plastic Zone Variation ahead of Fatigue Crack Tip

2018 ◽  
Vol 165 ◽  
pp. 06004
Author(s):  
Zhang Wei ◽  
Zhou Daoqing ◽  
Cai Liang
Keyword(s):  
Plastic Deformation ◽  
Fatigue Crack ◽  
Plastic Zone ◽  
Crack Growth ◽  
Crack Tip ◽  
Image Correlation ◽  
In Situ Observation ◽  
Crack Growth Behaviour ◽  
Single Overload

The plastic deformation ahead of crack tip is of great significance to analysis of the fatigue crack growth behaviour. Using the in-situ microscopy experiment technique, the variation of strain field in the vicinity of crack tip is investigated within load cycles at the small time scale. The contours of plastic zones are measured through the in-situ observation and digital image correlation (DIC). Finite element method (FEM) is also used to simulate the plasticity ahead of the crack tip. Furthermore, the numerical studies are extended to the single overload case to analyse the effect of large plastic zone on the subsequent crack growth. The evolution of residual stress is extracted by FEM simulation to explore the influence of plastic deformation before, during and after the single overload applied on the following crack propagation. Based on the FEM analysis, a model is proposed to approximate the size of the overload effect zone. Finally, some experimental data and numerical simulations are employed to validate this model.

In-situ observation of plastic deformation of Fe-Si bicrystals by white-beam synchrotron radiation topography

1998 ◽  
Vol 78 (1) ◽  
pp. 105-130 ◽  
Author(s):  
M. Polcarová ◽  
J. Gemperlová ◽  
J. Brádler ◽  
A. Jacques ◽  
A. George ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Synchrotron Radiation ◽  
In Situ Observation ◽  
White Beam

scholarly journals In situ observation of deformation processes in nanocrystalline face-centered cubic metals

2016 ◽  
Vol 7 ◽  
pp. 572-580 ◽  
Author(s):  
Aaron Kobler ◽  
Christian Brandl ◽  
Horst Hahn ◽  
Christian Kübel
Keyword(s):  
Thin Films ◽  
Plastic Deformation ◽  
Large Angle ◽  
In Situ Observation ◽  
Face Centered Cubic ◽  
Nanocrystalline Metals ◽  
Deformation Processes ◽  
Face Centered ◽  
Grain Boundary Motion

The atomistic mechanisms active during plastic deformation of nanocrystalline metals are still a subject of controversy. The recently developed approach of combining automated crystal orientation mapping (ACOM) and in situ straining inside a transmission electron microscope was applied to study the deformation of nanocrystalline Pd x Au1− x thin films. This combination enables direct imaging of simultaneously occurring plastic deformation processes in one experiment, such as grain boundary motion, twin activity and grain rotation. Large-angle grain rotations with ≈39° and ≈60° occur and can be related to twin formation, twin migration and twin–twin interaction as a result of partial dislocation activity. Furthermore, plastic deformation in nanocrystalline thin films was found to be partially reversible upon rupture of the film. In conclusion, conventional deformation mechanisms are still active in nanocrystalline metals but with different weighting as compared with conventional materials with coarser grains.

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