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An Experimental Investigation on the Strain Rate Sensitivity of a Severely Deformed Aluminum Alloy

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Abstract

The behavior of AA6063 aluminum alloy processed by expansion equal channel angular extrusion (Ex-ECAE) was investigated for various strain rates (10−1 ~ 3.2 × 103 s−1). Ex-ECAE experiments were performed at different temperatures and ram velocities. The experimental results indicated that the Ex-ECAE process remarkably increased both the strain rate sensitivity and flow stress of the material. Moreover, the apparent activation volume was significantly reduced for Ex-ECAEd samples in comparison with the annealed billets. The effects of ram velocity and temperature of the Ex-ECAE process on the product mechanical behavior were also studied by means of the response surface method. It was observed that at higher strain rates, other flow mechanisms such as viscous drag could be activated within the material.

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Abbreviations

A :

Cross sectional area of bars in the split Hopkinson pressure bar

A s :

Cross sectional area of the cylindrical sample

C 0 :

Longitudinal elastic wave velocity in the split Hopkinson pressure bar

E :

Young’s modulus

∆F :

Helmholtz activation energy

K :

Boltzmann’s constant

l s :

Length of cylindrical sample

m :

Strain rate sensitivity

T :

Absolute temperature

V a :

Apparent activation volume

ε t :

Transmitted strain pulse in the split Hopkinson pressure bar

\( {\dot{\varepsilon}}_0 \) :

Reference normal strain rate

ε r :

Reflected strain pulse in the split Hopkinson pressure bar

ε :

Total strain

\( \dot{\varepsilon} \) :

Total strain rate

σ a :

Non-thermal component of normal stress

σ :

Total stress

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Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, 69178, Iran

    F. Fereshteh-Saniee, S. Sepahi-Boroujeni, S. Lahmi & G. H. Majzoobi

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  1. F. Fereshteh-Saniee
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  2. S. Sepahi-Boroujeni
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  3. S. Lahmi
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  4. G. H. Majzoobi
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Correspondence to S. Sepahi-Boroujeni.

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Fereshteh-Saniee, F., Sepahi-Boroujeni, S., Lahmi, S. et al. An Experimental Investigation on the Strain Rate Sensitivity of a Severely Deformed Aluminum Alloy. Exp Mech 55, 569–576 (2015). https://doi.org/10.1007/s11340-014-9968-x

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