An internal variable approach to high temperature deformation and superplasticity of Mg alloys

2007 ◽  
Vol 187-188 ◽  
pp. 550-554 ◽  
Author(s):  
H.S. Lee ◽  
J.S. Park ◽  
Y.W. Chang
Keyword(s):  
High Temperature ◽  
Internal Variable ◽  
Mg Alloys ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Variable Approach

scholarly journals High Temperature Deformation Behavior of 8090 Al-Li Alloy

2013 ◽  
Vol 2013 ◽  
pp. 1-9
Author(s):  
Woo Young Jung ◽  
Tae Kwon Ha
Keyword(s):  
High Temperature ◽  
Deformation Behavior ◽  
Internal Variable ◽  
Grain Boundary Sliding ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Flow Curves ◽  
Variable Theory ◽  
Self Diffusion ◽  
Internal Variable Theory

High temperature deformation behavior, especially the superplasticity of an 8090 Al-Li alloy, was studied within the recent framework of the internal variable theory of structural superplasticity. In this study, a series of load relaxation tests were conducted at various temperatures ranging from 200°C to 530°C to obtain the flow curves of log ε˙versus log ε. The effect of grain size was also examined by varying the grain sizes through a proper thermomechanical treatment. The flow curves were found to be composite curves consisting of contributions from grain boundary sliding (GBS) and grain matrix deformation (GMD) at superplastic temperatures. The activation energy obtained for GMD was 124.9 kJ/mole in the temperature range from 470°C to 530°C, very similar to that for self-diffusion in pure Al.

High temperature deformation behavior of Al–Cu–Mg alloys micro-alloyed with Sn

2010 ◽  
Vol 527 (10-11) ◽  
pp. 2498-2503 ◽  
Author(s):  
Sanjib Banerjee ◽  
P.S. Robi ◽  
A. Srinivasan ◽  
Lakavath Praveen Kumar
Keyword(s):  
High Temperature ◽  
Deformation Behavior ◽  
Mg Alloys ◽  
High Temperature Deformation ◽  
Temperature Deformation

Cavitation during high-temperature deformation in Al–Mg alloys

2013 ◽  
Vol 61 (7) ◽  
pp. 2403-2413 ◽  
Author(s):  
Hiroyuki Toda ◽  
Zul Azri Bin Shamsudin ◽  
Kazuyuki Shimizu ◽  
Kentaro Uesugi ◽  
Akihisa Takeuchi ◽  
...  
Keyword(s):  
High Temperature ◽  
Mg Alloys ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Al Mg Alloys

Large Deformability of Wrought Magnesium Alloys: Is Superplasticity Needed?

2010 ◽  
Vol 433 ◽  
pp. 267-272 ◽  
Author(s):  
R. Boissière ◽  
Jean Jacques Blandin ◽  
Luc Salvo
Keyword(s):  
High Temperature ◽  
Strain Rate ◽  
Magnesium Alloys ◽  
Rate Sensitivity ◽  
Solute Drag ◽  
Mg Alloys ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Fine Grained ◽  
Superplastic Properties

The deformability of wrought magnesium alloys at room temperature is limited and a way to overcome this limit is to carry out forming operations in warm or hot conditions. In the case of fine grained alloys, superplastic properties can be generally achieved but in this regime, the Mg alloys are sensitive to strain induced cavitation. However, large grained alloys can also exhibit quite large deformabilities when they are deformed at high temperature. This can be due to the fact that on one hand, the Mg alloys may quite easily dynamically recrystallize and on the other hand, that dislocation movements may be controlled by a solute drag effect leading to significant strain rate sensitivity parameters. These various mechanisms of deformation will depend on the composition, the mean grain size and the conditions of deformation (i.e. temperature and strain rate). In this work, the high temperature deformation mechanisms as well as the associated damage mechanisms of two wrought magnesium alloys are discussed.

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