scholarly journals Characterization of Shear Deformation Based on In-situ Observation of Deformation in Semi-Solid Al-Cu Alloys and Water-Particle Mixture

2013 ◽  
Vol 99 (2) ◽  
pp. 141-148 ◽  
Author(s):  
Tomoya Nagira ◽  
Hiroyoshi Yokota ◽  
Shugo Morita ◽  
Hideyuki Yasuda ◽  
Masato Yoshiya ◽  
...  
Keyword(s):  
Shear Deformation ◽  
In Situ Observation ◽  
Water Particle ◽  
Particle Mixture ◽  
Cu Alloys ◽  
Semi Solid

scholarly journals Characterization of Shear Deformation Based on In-situ Observation of Deformation in Semi-solid Al–Cu Alloys and Water-particle Mixture

2013 ◽  
Vol 53 (7) ◽  
pp. 1195-1201 ◽  
Author(s):  
Tomoya Nagira ◽  
Hiroyoshi Yokota ◽  
Shugo Morita ◽  
Hideyuki Yasuda ◽  
Masato Yoshiya ◽  
...  
Keyword(s):  
Shear Deformation ◽  
In Situ Observation ◽  
Water Particle ◽  
Particle Mixture ◽  
Cu Alloys ◽  
Semi Solid

scholarly journals In-situ characterization of growth of isothermal ω phase in metastable β-Ti alloy TIMETAL LCB

2020 ◽  
Vol 321 ◽  
pp. 11037
Author(s):  
J. Nejezchlebova ◽  
L. Bodnarova ◽  
M. Janovska ◽  
P. Sedlak ◽  
H. Seiner ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Elastic Constants ◽  
Elastic Anisotropy ◽  
Solid Phase ◽  
In Situ Observation ◽  
Ω Phase ◽  
Resonant Ultrasound ◽  
Isothermal Ageing

Metastable β-Ti alloys exhibit various solid-solid phase transitions. Our study is focused on the characterization of the diffusion controlled β→ωiso phase transition. The particles of ω phase play an important part in thermomechanical treatment since they serve as heterogeneous nucleation sites for precipitation of finely dispersed particles of hexagonal α phase. The in-situ observation of the growth of particles of ω phase could be difficult by conventional techniques. However, it was shown recently that the ω phase significantly influences the elastic constants of the material, and the different forms of ω phase have different effects on the elastic anisotropy, as well as on the internal friction coefficients. Therefore, the β→ω phase transformation could be in-situ observed by the precise measurement of the tensor of elastic constants. In this contribution, we present the study of the kinetics of the β→ωiso phase transformation by resonant ultrasound spectroscopy. The polycrystalline samples of TIMETAL LCB alloy were in-situ examined by this technique during isothermal and non-isothermal ageing at temperatures up to 300 °C.

Microstructure Evolution during Semi-Solid Processing of SCN-Water and Sn-Pb Alloys

2006 ◽  
Vol 116-117 ◽  
pp. 437-440
Author(s):  
Tao Li ◽  
Xin Lin ◽  
Wei Dong Huang
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Microstructure Evolution ◽  
In Situ Observation ◽  
Cooling Process ◽  
Mechanical Stirring ◽  
Stirring Rate ◽  
Single Grain ◽  
Semi Solid

Microstructure evolution was investigated during the solidification of succinonitrile-5at.% water transparent alloy and Sn–15 wt.%Pb alloy under mechanical stirring through in-situ observation and quenching, separately. The results showed that the evolution of primary microstructures under stirring experienced the growth of single grain particle and the successive agglomerating and coarsening of multi-particles when the particle size reached a certain value. The increase of stirring rate promoted the globular growth of solidification microstructure after it nucleated in the melt and increase the grain size. Thus, the microstructure during semi-solid processing could be refined by a controlled stirring and cooling process, which depended on the optimization among the stirring rate, cooling rate and temperature at which the stirring rate is changed.

scholarly journals In situ observation of biotite (001) surface dissolution at pH 1 and 9.5 by advanced optical microscopy

2015 ◽  
Vol 6 ◽  
pp. 665-673 ◽  
Author(s):  
Chiara Cappelli ◽  
Daniel Lamarca-Irisarri ◽  
Jordi Camas ◽  
F Javier Huertas ◽  
Alexander E S Van Driessche
Keyword(s):  
Secondary Phase ◽  
In Situ Observation ◽  
Differential Interference Contrast Microscopy ◽  
Confocal Raman Spectroscopy ◽  
Solution Ph ◽  
Contrast Microscopy ◽  
Interference Contrast Microscopy ◽  
Step Edges

Laser confocal differential interference contrast microscopy (LCM-DIM) allows for the study of the reactivity of surface minerals with slow dissolution rates (e.g., phyllosilicates). With this technique, it is possible to carry out in situ inspection of the reacting surface in a broad range of pH, ionic strength and temperature providing useful information to help unravel the dissolution mechanisms of phyllosilicates. In this work, LCM-DIM was used to study the mechanisms controlling the biotite (001) surface dissolution at pH 1 (11 and 25 °C) and pH 9.5 (50 °C). Step edges are the preferential sites of dissolution and lead to step retreat, regardless of the solution pH. At pH 1, layer swelling and peeling takes place, whereas at pH 9.5 fibrous structures (streaks) form at the step edges. Confocal Raman spectroscopy characterization of the reacted surface could not confirm if the formation of a secondary phase was responsible for the presence of these structures.

In Situ Observation of Deformation in Semi-solid Fe-C Alloys at High Shear Rate

2014 ◽  
Vol 45 (12) ◽  
pp. 5613-5623 ◽  
Author(s):  
Tomoya Nagira ◽  
Shugo Morita ◽  
Hiroyoshi Yokota ◽  
Hideyuki Yasuda ◽  
Christopher M. Gourlay ◽  
...  
Keyword(s):  
Shear Rate ◽  
High Shear Rate ◽  
In Situ Observation ◽  
High Shear ◽  
Semi Solid

In Situ X-Ray Microtomography Investigation of the Deformation Mechanisms of Al-Cu Alloys in the Semi-Solid State

2009 ◽  
Vol 618-619 ◽  
pp. 275-278 ◽  
Author(s):  
Sofiane Terzi ◽  
Luc Salvo ◽  
Michel Suéry ◽  
Jérôme Adrien ◽  
Éric Maire ◽  
...  
Keyword(s):  
Solid State ◽  
Pore Formation ◽  
Deformation Behaviour ◽  
Liquid Films ◽  
Deformation Mechanisms ◽  
X Ray ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Semi Solid

This paper is concerned with an investigation of the deformation behaviour of an Al-Cu alloy during tensile testing in the semi-solid state. It was carried out by fast in-situ X-Ray microtomography at ESRF, Grenoble. Deformation was performed at constant velocity, which was chosen to be small enough so as not to affect the acquisition of the images. It is observed that deformation is accompanied, initially, by some liquid flow from the adjacent regions towards the deformed zone. Then pores form in the liquid films and grow until they occupy a significant part of the cross section of the specimen. Quantification of this phenomenon was carried out thus leading to a better understanding of pore formation in semi-solid mixtures.

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.

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