Internal Strain Distribution in Freestanding Porous Silicon

2009 ◽  
Vol 156 (12) ◽  
pp. K215 ◽  
Author(s):  
Y. A. Pusep ◽  
A. D. Rodrigues ◽  
J. C. Galzerani ◽  
R. D. Arce ◽  
R. R. Koropecki ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Strain Distribution ◽  
Internal Strain

Nanostructure and Internal Strain Distribution in Porous Silicon

2011 ◽  
Vol 11 (10) ◽  
pp. 9136-9142 ◽  
Author(s):  
Mihaela Miu ◽  
Mihai Danila ◽  
Irina Kleps ◽  
Adina Bragaru ◽  
Monica Simion
Keyword(s):  
Porous Silicon ◽  
Strain Distribution ◽  
Internal Strain

scholarly journals Revealing the Microstructural Aspects of the Corrosion Dynamics in Rapidly Solidified Mg-Zn-Y Alloys Using the Acoustic Emission Technique

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7828
Author(s):  
Daria Drozdenko ◽  
Michiaki Yamasaki ◽  
Kristián Máthis ◽  
Patrik Dobroň ◽  
Shin-ichi Inoue ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Strain Distribution ◽  
Protective Layer ◽  
Internal Strain ◽  
Hydrogen Release ◽  
Uniform Corrosion ◽  
Secondary Phases ◽  
Extrusion Speed ◽  
Average Grain Size ◽  
Rapidly Solidified

This work was focused on revealing the relation between the microstructure and corrosion dynamics in dilute Mg97.94Zn0.56Y1.5 (at.%) alloys prepared by the consolidation of rapidly solidified (RS) ribbons. The dynamics of the corrosion were followed by common electrochemical methods and the acoustic emission (AE) technique. AE monitoring offers instantaneous feedback on changes in the dynamics and mode of the corrosion. In contrast, the electrochemical measurements were performed on the specimens, which had already been immersed in the solution for a pre-defined time. Thus, some short-term corrosion processes could remain undiscovered. Obtained results were completed by scanning electron microscopy, including analysis of a cross-section of the corrosion layer. It was shown that the internal strain distribution, the grain morphology, and the distribution of the secondary phases play a significant role in the corrosion. The alloys are characterized by a complex microstructure with elongated worked and dynamically recrystallized α-Mg grains with an average grain size of 900 nm. Moreover, the Zn- and Y-rich stacking faults (SFs) were dispersed in the grain interior. In the alloy consolidated at a lower extrusion speed, the homogeneous internal strain distribution led to uniform corrosion with a rate of 2 mm/year and a low hydrogen release. The consolidation at a higher extrusion speed resulted in the formation of uneven distribution of internal strains with remaining high strain levels in non-recrystallized grains, leading to inhomogeneous growth and breakdown of the corrosion layers. Therefore, homogeneity of the internal strain distribution is of key importance for the uniform formation of a protective layer.

Measurement of Internal Strain in Materials Using High Energy White X-Ray at SPring-8

2008 ◽  
Vol 571-572 ◽  
pp. 267-270 ◽  
Author(s):  
Junichi Shibano ◽  
Takahisa Shobu ◽  
Kenji Suzuki ◽  
Koji Kiriyama ◽  
Kentaro Kajiwara ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Strain Measurement ◽  
Strain Distribution ◽  
Basic Research ◽  
High Energy ◽  
Internal Strain ◽  
High Tensile Strength ◽  
X Ray ◽  
Bending Strain ◽  
High Degree

This paper presents a basic research on a measurement of strain in the bulk of materials by using high energy white X-ray from a synchrotron radiation source of SPring-8 in Japan. A high-tensile strength steel (JIS-SHY685) was used as a specimen loaded with bending. Strain distribution in it was evaluated by the energy dispersive method using diffracted X-ray transmitted through the specimen. As a result, the internal strain of high-tensile steel of 5, 10 and 15 mm thickness could be evaluated using white X-ray which range of energy from 50 keV to 150 keV. The measurement with a high degree of accuracy was accomplished using α-Fe321 diffraction in this material. The results showed that the internal strain measurement in the depth of the order of millimeter using the high energy white X-ray is practicable at SPring-8.

scholarly journals Internal Strain Distribution of Laser Lap Joints in Steel under Loading Studied by High-Energy Synchrotron Radiation X-rays

2021 ◽  
Vol 5 (2) ◽  
pp. 17
Author(s):  
Takahisa Shobu ◽  
Ayumi Shiro ◽  
Fumiaki Kono ◽  
Toshiharu Muramatsu ◽  
Tomonori Yamada ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Strain Distribution ◽  
Measurement Techniques ◽  
Tensile Load ◽  
High Energy ◽  
Lap Joints ◽  
Internal Strain ◽  
High Energy Density ◽  
X Rays ◽  
X Ray

The automotive industries employ laser beam welding because it realizes a high energy density without generating irradiation marks on the opposite side of the irradiated surface. Typical measurement techniques such as strain gauges and tube X-rays cannot assess the localized strain at a joint weld. Herein high-energy synchrotron radiation X-ray diffraction was used to study the internal strain distribution of laser lap joint PNC-FMS steels (2- and 5-mm thick) under loading at a high temperature. As the tensile load increased, the local tensile and compressive strains increased near the interface. These changes agreed well with the finite element analysis results. However, it is essential to complementarily utilize internal defect observations by X-ray transmission imaging because the results depend on the defects generated by laser processing.

scholarly journals Evaluation of Internal Strain Distribution in Glass-Short-Fiber Reinforced Plastics by Synchrotron Strain-Scanning Method

2020 ◽  
Vol 69 (4) ◽  
pp. 300-307
Author(s):  
Kenichi SHIMIZU ◽  
Keisuke IWAHORI ◽  
Tatsuki SATO ◽  
Hiromu TSUCHIHASHI ◽  
Naoki KATO ◽  
...  
Keyword(s):  
Strain Distribution ◽  
Short Fiber ◽  
Internal Strain ◽  
Fiber Reinforced ◽  
Scanning Method ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics
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