scholarly journals Fabrication and characterization of nanostructured immiscible Cu–Ta alloys processed by high-pressure torsion

2020 ◽  
Vol 832 ◽  
pp. 155007 ◽  
Author(s):  
Tayebeh Mousavi ◽  
Jiaoyan Dai ◽  
Piotr Bazarnik ◽  
Pedro Henrique R. Pereira ◽  
Yi Huang ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Fabrication And Characterization

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.

Microstructure Development and Precipitation Effects in Ultra Fine Grained Mg-3Tb-2Nd Alloy Prepared by High Pressure Torsion

2008 ◽  
Vol 584-586 ◽  
pp. 591-596 ◽  
Author(s):  
Jakub Čížek ◽  
Ivan Procházka ◽  
Bohumil Smola ◽  
Ivana Stulíková ◽  
Martin Vlach ◽  
...  
Keyword(s):  
High Pressure ◽  
Positron Lifetime ◽  
High Pressure Torsion ◽  
Creep Properties ◽  
Fine Grained ◽  
Transmission Electron ◽  
Highly Sensitive ◽  
Ideal Tool ◽  
Increasing Temperature

Mg-Tb-Nd ternary alloy represents a novel hardenable Mg-based alloy with enhanced strength and favorable creep properties. In the present work we studied microstructure of ultra fine grained (UFG) Mg-Tb-Nd alloy prepared by high pressure torsion (HPT). Lattice defects introduced into the specimen by the severe plastic deformation play a key role in physical properties of UFG specimens. It is known that positron lifetime (PL) spectroscopy is highly sensitive to open volume defects (like vacancies, dislocations, etc.). Therefore, PL spectroscopy is an ideal tool for defect characterizations in the HPT deformed specimens. In the present work we combined PL studies with transmission electron microscopy and microhardness measurements. After detailed characterization of the as-deformed structure, the specimens were step-by-step isochronally annealed and we investigated the development of microstructure with increasing temperature.

Surface characterization of TiNi deformed by high-pressure torsion

2014 ◽  
Vol 289 ◽  
pp. 338-344 ◽  
Author(s):  
Dayangku Noorfazidah Awang Shri ◽  
Koichi Tsuchiya ◽  
Akiko Yamamoto
Keyword(s):  
High Pressure ◽  
Surface Characterization ◽  
High Pressure Torsion

FABRICATION AND CHARACTERIZATION OF QUINACRIDONES NANOCRYSTALS BY HIGH-TEMPERATURE AND HIGH-PRESSURE CRYSTALLIZATION METHOD

2002 ◽  
Vol 01 (05n06) ◽  
pp. 587-592 ◽  
Author(s):  
BO LI ◽  
HITOSHI KASAI ◽  
HIDETOSHI OIKAWA ◽  
SHUJI OKADA ◽  
KUNIO ARAI ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Spherical Shape ◽  
Crystal Form ◽  
Experimental Conditions ◽  
Crystallization Method ◽  
Fabrication And Characterization ◽  
Average Size ◽  
Pressure Crystallization

The high-temperature and high-pressure liquid (HTPL) crystallization method was proved to be effective to fabricate nanocrystals of quinacridone and its dimethyl derivative. The quinacridone nanocrystals were spherical shape and monodispersed with the average size of around 50 nm, respectively. It was found that quinacridone nanocrystal in different crystal form could be obtained by changing experimental conditions in HTPL method.

Characterization of a nanocrystalline Mg–Ni alloy processed by high-pressure torsion during hydrogenation and dehydrogenation

2016 ◽  
Vol 41 (23) ◽  
pp. 9803-9809 ◽  
Author(s):  
Marcell Gajdics ◽  
Marco Calizzi ◽  
Luca Pasquini ◽  
Erhard Schafler ◽  
Ádám Révész
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Ni Alloy

Microstructure of Pure Ni Subjected to High Pressure Torsion

2010 ◽  
Vol 667-669 ◽  
pp. 529-534 ◽  
Author(s):  
Hong Wen Zhang ◽  
Xiao Xu Huang ◽  
Niels Hansen ◽  
Reinhard Pippan
Keyword(s):  
High Pressure ◽  
Misorientation Angle ◽  
High Pressure Torsion ◽  
Structural Parameters ◽  
Structural Features ◽  
Structural Refinement ◽  
Boundary Misorientation ◽  
Transmission Electron ◽  
Structure Strength

Plastic deformation leads to a structural refinement by introducing low angle dislocation boundaries and high angle boundaries in the initial coarse grains. To understand the mechanisms for the structural refinement and to establish the structure-strength relationship requires a precise characterization of key structural parameters, namely the boundary spacing and boundary misorientation angle. This study gives the results of such a characterization of pure Ni subjected to high pressure torsion (HPT) up to a strain of 300. The structural analysis was carried out by transmission electron microscopy in the longitudinal sample section in which the detailed structural features can be resolved. It is found that the microstructure in the HPT Ni samples is dominated by a lamellar structure. The spacing of the lamellar boundaries decreases and their misorientation angle increases with strain following a power law up to strain of 12, above which saturation is reached at a strain of about 34. The distribution of lamellar spacings normalized by their respective average values at each strain show an identical form. This scaling behavior is discussed also with reference to other metals and processing routes.

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