scholarly journals Separate Determination of Work-Hardening and Softening Rates during High-Temperature Deformation of Pure Aluminum

1980 ◽  
Vol 44 (11) ◽  
pp. 1273-1281 ◽  
Author(s):  
Zenji Horita ◽  
Hideo Yoshinaga
Keyword(s):  
High Temperature ◽  
Work Hardening ◽  
Pure Aluminum ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Separate Determination ◽  
Hardening And Softening

High-temperature plasticity of cubic bismuth oxide

1996 ◽  
Vol 11 (6) ◽  
pp. 1433-1439 ◽  
Author(s):  
Anne Vilette ◽  
S. L. Kampe
Keyword(s):  
High Temperature ◽  
Strain Rate ◽  
Bismuth Oxide ◽  
Rate Sensitivity ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Cubic Phase ◽  
Superplastic Behavior ◽  
Wide Range

Cubic (δ) bismuth oxide (Bi2O3) has been subjected to high temperature deformation over a wide range of temperatures and strain rates. Results indicate that bismuth oxide is essentially incapable of plastic deformation at temperatures below the monoclithic to cubic phase transformation which occurs at approximately 730 °C. Above the transformation temperature, however, Bi2O3 is extensively deformable. The variability of flow stress to temperature and strain rate has been quantified through the determination of phenomenological-based constitutive equations to describe its behavior at these high temperatures. Analysis of the so-determined deformation constants indicate an extremely strong sensitivity to strain rate and temperature, with values of the strain-rate sensitivity approaching values commonly cited as indicative of superplastic behavior.

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