Superplasticity, dynamic grain growth and deformation mechanism in ultra-light two-phase magnesium–lithium alloys

2010 ◽  
Vol 527 (9) ◽  
pp. 2335-2341 ◽  
Author(s):  
F.R. Cao ◽  
H. Ding ◽  
Y.L. Li ◽  
G. Zhou ◽  
J.Z. Cui
Keyword(s):  
Grain Growth ◽  
Deformation Mechanism ◽  
Two Phase ◽  
Dynamic Grain Growth ◽  
Lithium Alloys

Superplastic Extrusion of Al2O3-YTZ Nanocomposite and Its Deformation Mechanism

2005 ◽  
Vol 475-479 ◽  
pp. 2973-2976 ◽  
Author(s):  
Guo Qing Chen ◽  
Kai Feng Zhang
Keyword(s):  
Elevated Temperature ◽  
Grain Growth ◽  
Deformation Mechanism ◽  
Tetragonal Zirconia ◽  
Extrusion Pressure ◽  
Second Phase ◽  
Temperature Range ◽  
Punch Speed ◽  
Dynamic Grain Growth

Using Al2O3-YTZ(3mol% yttria stabilized tetragonal zirconia) nanocomposite, superplastic extrusion under different conditions was adopted to form blade models. The results demonstrate that desired microstructure is achieved through the addition of 20mol% YTZ which acts as a second-phase pinning agent. At temperature range of 1650°C to 1700°C the material shows good deformability. At this elevated temperature the maximum extrusion pressure is lower than 25MPa, and the maximum punch speed is about 0.35mm·min-1. In superplastic extrusion the dominating deformation mechanism is grain sliding and rotation, the accommodating mechanism is intergranular zirconia coordinated deformation. Meanwhile static and dynamic grain growth also plays an important role in deformation.

Microstructure of Polycrystalline MgO Penetrated by a Silicate Liquid

1996 ◽  
Vol 2 (3) ◽  
pp. 113-128 ◽  
Author(s):  
Sundar Ramamurthy ◽  
Michael P. Mallamaci ◽  
Catherine M. Zimmerman ◽  
C. Barry Carter ◽  
Peter R. Duncombe ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Grain Growth ◽  
Glassy Phase ◽  
Silicate Liquid ◽  
Two Phase ◽  
The Matrix ◽  
Devitrification Process ◽  
Phase Mixture

Dense, polycrystalline MgO was infiltrated with monticellite (CaMgSiO4) liquid to study the penetration of liquid along the grain boundaries of MgO. Grain growth was found to be restricted with increasing amounts of liquid. The inter-granular regions were generally found to be comprised of a two-phase mixture: crystalline monticellite and a glassy phase rich in the impurities present in the starting MgO material. MgO grains act as seeding agents for the crystallization of monticellite. The location and composition of the glassy phase with respect to the MgO grains emphasizes the role of intergranular liquid during the devitrification process in “snowplowing” impurities present in the matrix.

Concurrent grain growth and coarsening of two-phase microstructures; large scale phase-field study

2019 ◽  
Vol 159 ◽  
pp. 160-176 ◽  
Author(s):  
Ramanathan Perumal ◽  
Michael Selzer ◽  
Britta Nestler
Keyword(s):  
Field Study ◽  
Grain Growth ◽  
Phase Field ◽  
Large Scale ◽  
Two Phase

Dynamic grain growth in Al–6Ni: Modelling and experiments

2005 ◽  
Vol 53 (16) ◽  
pp. 4313-4321 ◽  
Author(s):  
K HYDE ◽  
P BATE
Keyword(s):  
Grain Growth ◽  
Dynamic Grain Growth

scholarly journals Modified Monte Carlo approach for simulation of grain growth and Ostwald ripening in two-phase Zn–22Al alloy

2020 ◽  
Vol 9 (5) ◽  
pp. 9620-9631
Author(s):  
Hossein Mohammadi ◽  
Ali Reza Eivani ◽  
Seyed Hossein Seyedein ◽  
Manojit Ghosh
Keyword(s):  
Monte Carlo ◽  
Grain Growth ◽  
Ostwald Ripening ◽  
Two Phase ◽  
Monte Carlo Approach

3D MС Simulation of Grain Growth Kinetics and the Zener Limit in Polycrystals

2014 ◽  
Vol 598 ◽  
pp. 8-12
Author(s):  
K.R. Phaneesh ◽  
Anirudh Bhat ◽  
Gautam Mukherjee ◽  
Kishore T. Kashyap
Keyword(s):  
Monte Carlo ◽  
Grain Growth ◽  
Growth Kinetics ◽  
Large Scale ◽  
Volume Fraction ◽  
Growth Exponent ◽  
Cube Root ◽  
Second Phase ◽  
Two Phase ◽  
Second Phase Particles

Large scale Potts model Monte Carlo simulation was carried on 3-dimensional square lattices of 1003 and 2003 sizes using the Metropolis algorithm to study grain growth behavior. Simulations were carried out to investigate both growth kinetics as well as the Zener limit in two-phase polycrystals inhibited in growth by second phase particles of single-voxel size. Initially the matrices were run to 10,000 Monte Carlo steps (MCS) to check the growth kinetics in both single phase and two-phase poly-crystals. Grain growth exponent values obtained as a result have shown to be highest (~ 0.4) for mono-phase materials while the value decreases with addition of second phase particles. Subsequently the matrices were run to stagnation in the presence of second phase particles of volume fractions ranging from 0.001to 0.1. Results obtained have shown a cube root dependence of the limiting grain size over the particle volume fraction thus reinforcing earlier 3D simulation efforts. It was observed that there was not much difference in the values of either growth kinetics or the Zener limit between 1003 and 2003 sized matrices, although the results improved mildly with size.

scholarly journals A Kinetic Model for Grain Growth in a Polycrystalline Ni-Co Base Superalloy with γ/γ′ Two-Phase

2010 ◽  
Vol 74 (10) ◽  
pp. 688-696 ◽  
Author(s):  
Toshio Osada ◽  
Yuefeng Gu ◽  
Yong Yuan ◽  
Tadaharu Yokokawa ◽  
Hiroshi Harada
Keyword(s):  
Kinetic Model ◽  
Grain Growth ◽  
Two Phase ◽  
Base Superalloy
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