High Strain Rate Superplasticity in a Zr and Sc Modified 7075 Aluminum Alloy Produced by ECAP

Krystof Turba; Premysl Malek; Edgar F. Rauch; Miroslav Cieslar

doi:10.4028/www.scientific.net/MSF.584-586.164

Paper Titles

The Influence of ECAP Die Channel Geometry on Shear Strain and Deformation Uniformity
p.145

Microstructure and Mechanical Properties of Nanostructured Intermetallic Alloy Based on Ti₂AlNb
p.153

The Features of Deformation Behavior of Ultra-Fine Grained Titanium and Aluminum Alloys under Conditions of High Strain Rate Superplasticity
p.159

High Strain Rate Superplasticity in a Zr and Sc Modified 7075 Aluminum Alloy Produced by ECAP
p.164

Influence of Number of Passes in ECAP on Superplastic Behavior in a Magnesium Alloy
p.170

The New Approach to Produce Al Sheets with UFG Structure Using SPD Processing
p.176

Grain Refinement and Deformation Behavior of Ultrafine Grained Pd and Pd-Ag Alloys Produced by HPT
p.182

Use of Ring Sample for High-Pressure Torsion and Microstructural Evolution with Equivalent Strain
p.191

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High Strain Rate Superplasticity in a Zr and Sc Modified 7075 Aluminum Alloy Produced by ECAP

Abstract:

Equal-channel angular pressing (ECAP) at 443 K was used to introduce an ultra-fine grained (UFG) microstructure to a Zr and Sc modified 7075 aluminum alloy. Using the methods of TEM and EBSD, an average grain size of 0.6 1m was recorded after the pressing. The UFG microstructure remained very stable up to the temperature of 723 K, where the material exhibited high strain rate superplasticity (HSRSP) with elongations to failure of 610 % and 410 % at initial strain rates of 6.4 x 10-2 s-1 and 1 x 10-1 s-1, respectively. A strain rate sensitivity parameter m in the vicinity of 0.45 was observed at temperatures as high as 773 K. At this temperature, the material still reached an elongation to failure of 430 % at 2 x 10-2 s-1. These results confirm the stabilizing effect of the Zr and Sc additions on the UFG microstructure in a 7XXX series aluminum alloy produced by severe plastic deformation.