Grain growth in nanograined aluminum oxide by high-pressure torsion: Phase transformation and plastic strain effects

2018 ◽  
Vol 152 ◽  
pp. 11-14 ◽  
Author(s):  
Ikuro Fujita ◽  
Kaveh Edalati ◽  
Xavier Sauvage ◽  
Zenji Horita
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Plastic Strain ◽  
Aluminum Oxide ◽  
Grain Growth ◽  
High Pressure Torsion ◽  
Strain Effects

Optical Properties of Nanocrystalline Monoclinic Y2O3 Stabilized by Grain Size and Plastic Strain Effects via High-Pressure Torsion

2017 ◽  
Vol 56 (5) ◽  
pp. 2576-2580 ◽  
Author(s):  
Hadi Razavi-Khosroshahi ◽  
Kaveh Edalati ◽  
Hoda Emami ◽  
Etsuo Akiba ◽  
Zenji Horita ◽  
...  
Keyword(s):  
Grain Size ◽  
High Pressure ◽  
Optical Properties ◽  
Plastic Strain ◽  
High Pressure Torsion ◽  
Strain Effects

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.

Microstructural evolution and phase transformation in twinning-induced plasticity steel induced by high-pressure torsion

2016 ◽  
Vol 109 ◽  
pp. 300-313 ◽  
Author(s):  
X.H. An ◽  
Q.Y. Lin ◽  
G. Sha ◽  
M.X. Huang ◽  
S.P. Ringer ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Microstructural Evolution ◽  
High Pressure Torsion

Crystal grain growth during phase transformation in cerium metal at high pressure

1995 ◽  
Vol 52 (13) ◽  
pp. 9107-9110 ◽  
Author(s):  
Guoliang Gu ◽  
Yogesh K. Vohra ◽  
Keith E. Brister
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Grain Growth

Graphite to diamond-like carbon phase transformation by high-pressure torsion

2013 ◽  
Vol 103 (3) ◽  
pp. 034108 ◽  
Author(s):  
Kaveh Edalati ◽  
Takeshi Daio ◽  
Yoshifumi Ikoma ◽  
Makoto Arita ◽  
Zenji Horita
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
High Pressure Torsion ◽  
Diamond Like Carbon ◽  
Carbon Phase

Cyclically induced grain growth within shear bands investigated in UFG Ni by cyclic high pressure torsion

2017 ◽  
Vol 32 (23) ◽  
pp. 4317-4326 ◽  
Author(s):  
Marlene Walpurga Kapp ◽  
Oliver Renk ◽  
Thomas Leitner ◽  
Pradipta Ghosh ◽  
Bo Yang ◽  
...  
Keyword(s):  
High Pressure ◽  
Grain Growth ◽  
High Pressure Torsion ◽  
Shear Bands ◽  
Image Position

Abstract

Phase Transformation and Annealing Behavior of SUS 304 Austenitic Stainless Steel Deformed by High Pressure Torsion

2010 ◽  
Vol 654-656 ◽  
pp. 334-337 ◽  
Author(s):  
Innocent Shuro ◽  
Minoru Umemoto ◽  
Yoshikazu Todaka ◽  
Seiji Yokoyama
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Phase Transformation ◽  
Austenitic Stainless Steel ◽  
Volume Fraction ◽  
High Pressure Torsion ◽  
Two Phase ◽  
Annealing Behavior ◽  
304 Austenitic Stainless Steel ◽  
Deformed State

SUS 304 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 to give a two phase structure of austenite (γ) and martensite (α') by the transformation γα'. The phase transformation was accompanied by an increase in hardness (Hv) from 1.6 GPa in the as annealed form to 5.4 GPa in the deformed state. Subsequent annealing in temperature range 250oC to 450oC resulted in an increase in both α' volume fraction and hardness (6.4 GPa). Annealing at 600oC resulted in a decrease in α' volume fraction hardness.

Finite element analysis of plasticity behaviour of aluminium alloys in high-pressure torsion compressive loading stage

2019 ◽  
Vol 10 (5) ◽  
pp. 692-703
Author(s):  
Fauziana Lamin ◽  
Ahmad Kamal Ariffin Ahmad Kamal Ariffin ◽  
Intan Fadhlina Mohamed
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
High Pressure ◽  
Plastic Strain ◽  
Aluminium Alloys ◽  
Material Flow ◽  
High Pressure Torsion ◽  
Compressive Loading ◽  
Content Type ◽  
Compression Stage

Purpose The purpose of this paper is to examine the plasticity behaviour of aluminium alloys in high-pressure torsion (HPT) compressive loading stage. It is a part of the strengthen lightweight material development through severe plastic deformation. Design/methodology/approach A finite element simulation of HPT compression stage by displacement control incremental loading was proposed by taking into account an unconstraint HPT configuration. The quasi-static condition was utilised, by embedding strain hardening plasticity constitutive model and considering frictional effects, to assess the plasticity behaviour of aluminium alloys, particularly AA2024 and AA6082. Findings The present investigation clearly indicates that the deviation of material flow as a result of sticking condition of µ⩾0.5, was found to be negligible. An inhomogeneous material flow along the sample radial and thickness direction was evident, producing a stress concentration at the edge of the loaded surface, indicating the anticipated region of failure. The effective plastic strain in the compression stage was also found to be significant. Based on the effective strain response, plasticity behaviour of the compressed sample was predicted. Originality/value This paper demonstrates the plasticity behaviour of the analysed aluminium alloys. Since the mechanical properties produced by the deformed material are closely related to the exerted plastic deformation, understanding the phenomenon associated with the plastic strain development is essential. The outcome of this research will assist in seizing the opportunities of improving both material properties and the HPT procedures.

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