scholarly journals Experimental Examination of Measurement Techniques of Threshold Stress in a Dispersion-Strengthened Alloy for High-Temperature Deformation

1994 ◽  
Vol 35 (9) ◽  
pp. 576-584
Author(s):  
Fuyuki Yoshida ◽  
Junji Sugamoto ◽  
Hideharu Nakashima ◽  
Hideo Yoshinaga
Keyword(s):  
High Temperature ◽  
Threshold Stress ◽  
Measurement Techniques ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Experimental Examination

scholarly journals Threshold Stress in Al-Mg-Mn Alloys during High Temperature Deformation

1988 ◽  
Vol 52 (7) ◽  
pp. 646-653 ◽  
Author(s):  
Hideharu Nakashima ◽  
Hironobu Hukushima ◽  
Shoji Goto ◽  
Hideo Yoshinaga
Keyword(s):  
High Temperature ◽  
Threshold Stress ◽  
High Temperature Deformation ◽  
Temperature Deformation

scholarly journals Threshold Stress for High-Temperature Deformation of Dispersion-Strengthened Alloys.

1993 ◽  
Vol 69 (7) ◽  
pp. 167-172
Author(s):  
Hideharu NAKASHIMA ◽  
Fuyuki YOSHIDA ◽  
Kunihiro NOGUCHI ◽  
Hideo YOSHINAGA
Keyword(s):  
High Temperature ◽  
Threshold Stress ◽  
High Temperature Deformation ◽  
Temperature Deformation

scholarly journals Threshold Stress for the High Temperature Deformation of Al–Mg–Mn Alloys

1990 ◽  
Vol 31 (4) ◽  
pp. 276-283 ◽  
Author(s):  
Hideharu Nakashima ◽  
Hironobu Fukushima ◽  
Shoji Goto ◽  
Hideo Yoshinaga
Keyword(s):  
High Temperature ◽  
Threshold Stress ◽  
High Temperature Deformation ◽  
Temperature Deformation

Effect of Heat Treatment Conditions on the High Temperature Deformation of 6082-Al Alloy

2009 ◽  
Vol 83-86 ◽  
pp. 407-414 ◽  
Author(s):  
Mahmoud S. Soliman ◽  
Ehab El-Danaf ◽  
Abdulhakim A. Almajid
Keyword(s):  
Activation Energy ◽  
High Temperature ◽  
Threshold Stress ◽  
High Temperature Deformation ◽  
Single Type ◽  
Temperature Deformation ◽  
Al Alloy ◽  
Second Phase ◽  
Dislocation Interaction ◽  
6082 Al Alloy

High-temperature deformation of an artificially aged 6082-Al alloy was conducted in the present investigation. Tensile tests were carried out at temperatures of 623, 673 and 723 K at various strain rates ranging from 5x10-5 to 2x10-2 s-1. The behavior of the alloy is characterized by high stress exponent, n and high apparent activation energy, Qa that are higher than what is usually observed in Al and Al solid-solution alloys under similar experimental conditions, which implies the presence of threshold stress; this behavior results from dislocation interaction with second phase particles. The threshold stress, σo values were seen to decrease exponentially with temperature. By incorporating the threshold stress in the analysis, the true activation energy, Qt was calculated to be close to that of dislocation pipe diffusion in Al. Analysis of the experimental data of the alloy in terms of the Zener- Hollomon parameter vs. normalized effective stress, revealed a single type of deformation behavior with an n value of ~7. Measurements showed that the values of elongation percent at failure increase with strain rate and temperature.

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