The Role of Interfaces in the High Temperature Deformation and Failure of Polycrystalline Alumina

1999 ◽  
Vol 304-306 ◽  
pp. 387-394
Author(s):  
Atul H. Chokshi
Keyword(s):  
High Temperature ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Polycrystalline Alumina ◽  
Deformation And Failure

The role of interphase boundary phenomena on mechanical behavior during high-temperature deformation

1991 ◽  
Vol 49 ◽  
pp. 594-595
Author(s):  
B. Hidalgo-Prada
Keyword(s):  
High Temperature ◽  
Mechanical Behavior ◽  
Interphase Boundary ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Metallographic Analysis ◽  
Two Phase ◽  
Transmission Electron ◽  
Phase Size

The influence of interphase boundary on the mechanical behavior of a two-phase (α/β) Ni-Modified Ti-6A1-4V alloy during superplastic deformation (SPD), has been investigated in the range of temperature and strain rate where maximum ductility is - attained.Uniaxial tests for constant and differential strain rates were performed over the - range of 5.0 x 10-5 s-1 to 5.0 x 10-3 s-1 and at temperature from 1023 to 1123 K. To optimize the initial microstructure, tensile specimens were static annealed in argon for 1 hour at 815 °C ( SA-1-815).Upon completion of the tests, specimens were quenched in pre-chilled argon to pre—serve the high temperature microstructure for metallographic analysis. The gage portion of the specimen was polished and etched in a solution of 2 ml HF, 3 ml HNO3 and 95 ml H2O. Subsequently, they were subjected to scanning and transmission electron - microscopy (SEM and TEM) examination. A Quantimet Image Analizer was used for determining the phase size, its distribution and volume fractions.

Weak-Beam Imaging of Coherent Twin Boundaries After High-Temperature Deformation

1985 ◽  
Vol 43 ◽  
pp. 242-243
Author(s):  
Krishna Rajan
Keyword(s):  
High Temperature ◽  
Base Alloy ◽  
Dark Field ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Weak Beam ◽  
Dark Field Microscopy ◽  
Cobalt Base Alloy ◽  
Cobalt Base

Weak beam dark field microscopy has been used extensively to study deformation induced intragranular defects in materials. However as noted by Tones et al weak beam imaging is also an asset in examining intergranular defects. The localisation of strain contrast close to the defect core by weak beam imaging allows the interaction of matrix dislocations with the boundary (to form extrinsic dislocations) to be studied more easily. Also, the reduction in extinction distance with weak beam microscopy produces a higher density of extinction contours, which allows topographical discontinuities associated with long range strain fields to be more readily observed.Thus in the present study, where we were interested in interfacial phenomena during high temperature deformation processing of a cobalt base alloy (Co-Cr-Mo), weak beam imaging was used to obtain a better understanding of the role of intergranular defects.

scholarly journals Prominent role of basal slip during high-temperature deformation of pure Mg polycrystals

2015 ◽  
Vol 85 ◽  
pp. 1-13 ◽  
Author(s):  
C.M. Cepeda-Jiménez ◽  
J.M. Molina-Aldareguia ◽  
F. Carreño ◽  
M.T. Pérez-Prado
Keyword(s):  
High Temperature ◽  
Basal Slip ◽  
High Temperature Deformation ◽  
Temperature Deformation
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