Changes in Microstructure during High Strain Rate Superplastic Deformation of an Al-Zn-Mg-Cu-Zr Alloy Containing Sc

2012 ◽  
pp. 819-824
Author(s):  
A.K. Mukhopadhyay ◽  
K.S. Prasad ◽  
A. Kumar ◽  
S. Raveendra ◽  
I. Samajdar
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Superplastic Deformation ◽  
High Strain ◽  
Zr Alloy

Key Microstructural Changes during High Strain Rate Superplastic Deformaion of an Al-Zn-Mg-Cu-Zr Alloy Containing Sc

2011 ◽  
Vol 702-703 ◽  
pp. 366-369
Author(s):  
A.K. Mukhopadhyay ◽  
A. Kumar ◽  
K.S. Prasad ◽  
S. Raveendra ◽  
Indradev Samajdar
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Superplastic Deformation ◽  
Considerable Increase ◽  
High Strain ◽  
Al Alloy ◽  
Number Density ◽  
Microstructural Changes ◽  
Early Stages ◽  
Zr Alloy

The changes in texture and microstructure that occur during superplastic deformation (SPD) of a suitably thermo-mechanically processed (TMP) Al alloy AA7010 containing Sc at a temperature and strain rate combination of 475°C, 1.9x10-2s-1 have been examined. It is observed that during the early stages of SPD, there is a significant increase in the Brass {110}<112> component as well as a considerable increase in the S {123}<634> component. Whilst, these components gradually decrease leading to the randomization of texture as the SPD process progresses to larger strains. These results are discussed in terms of the nature of the TMP together with significant variations in the number density of Al3ScxZr1-x dispersoids and percentage recrystallization with strain.

Changes in Microstructure during High Strain Rate Superplastic Deformation of an Al-Zn-Mg-Cu-Zr Alloy Containing Sc

2012 ◽  
pp. 819-824
Author(s):  
A. K. Mukhopadhyay ◽  
K. S. Prasad ◽  
A. Kumar ◽  
S. Raveendra ◽  
I. Samajdar
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Superplastic Deformation ◽  
High Strain ◽  
Zr Alloy

scholarly journals High Strain Rate Superplasticity in Al-Zn-Mg-Based Alloy: Microstructural Design, Deformation Behavior, and Modeling

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2098 ◽  
Author(s):  
Olga Yakovtseva ◽  
Maria Sitkina ◽  
Ahmed O. Mosleh ◽  
Anastasia Mikhaylovskaya
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Superplastic Deformation ◽  
High Strain ◽  
Flow Behavior ◽  
Constant Strain Rate ◽  
Superplastic Forming ◽  
High Strength ◽  
Strain Rate Range ◽  
Strain Rates

Increasing the strain rate at superplastic forming is a challenging technical and economic task of aluminum forming manufacturing. New aluminum sheets exhibiting high strain rate superplasticity at strain rates above 0.01 s−1 are required. This study describes the microstructure and the superplasticity properties of a new high-strength Al-Zn-Mg-based alloy processed by a simple thermomechanical treatment including hot and cold rolling. The new alloy contains Ni to form Al3Ni coarse particles and minor additions of Zr (0.19 wt.%) and Sc (0.06 wt.%) to form nanoprecipitates of the L12-Al3 (Sc,Zr) phase. The design of chemical and phase compositions of the alloy provides superplasticity with an elongation of 600–800% in a strain rate range of 0.01 to 0.6/s and residual cavitation less than 2%. A mean elongation-to-failure of 400% is observed at an extremely high constant strain rate of 1 s−1. The strain-induced evolution of the grain and dislocation structures as well as the L12 precipitates at superplastic deformation is studied. The dynamic recrystallization at superplastic deformation is confirmed. The superplastic flow behavior of the proposed alloy is modeled via a mathematical Arrhenius-type constitutive model and an artificial neural network model. Both models exhibit good predictability at low and high strain rates of superplastic deformation.

The Microstructure and High-Strain-Rate Superplasticity of the Al–Mg–Ni–Fe–Mn–Cr–Zr Alloy

2019 ◽  
Vol 120 (10) ◽  
pp. 1006-1013 ◽  
Author(s):  
A. A. Kishchik ◽  
A. D. Kotov ◽  
A. V. Mikhaylovskaya
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Zr Alloy

Microstructure and Superplasticity of an Al-Mg-Sc-Zr Alloy Processed by ECAP and Subsequent Cold Rolling

2015 ◽  
Vol 830-831 ◽  
pp. 345-349 ◽  
Author(s):  
Elena Avtokratova ◽  
Oleg Sitdikov ◽  
Oksana Mukhametdinova ◽  
Michael Markushev ◽  
S.V.S. Narayana Murty ◽  
...  
Keyword(s):  
Cold Rolling ◽  
High Strain Rate ◽  
Ambient Temperature ◽  
Strain Rate ◽  
Equal Channel Angular Pressing ◽  
High Strain ◽  
Strain Rates ◽  
Angular Pressing ◽  
Zr Alloy

The feasibility has been demonstrated for achieving high-strain-rate superplasticity with elongations beyond 2000% in Al-Mg-Sc-Zr alloy with the partially recrystallized structure, produced by warm equal-channel angular pressing to strain of e~3 only. Subsequent alloy ambient temperature rolling up to e~1.6 enhanced the superplastic elongations and moved the optimum of superplasticity toward the higher strain rates.

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