The Effect of Strain Rate and Temperature on the Mechanical Behavior of Al/Fe Interface Under Compressive Loading
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UNDERSTANDING the mechanical response of metallic materials subjected to extreme thermo-mechanical loading is of great importance in many engineering and technological applications such as solid state welding and explosive forming. For characterizing the behavior of metals under such ultrahigh strain rates and temperatures, shock and impact techniques (including shock compression and laser driven experiments) have been used to investigate the different aspects of plastic deformation. However, and due to the extremity of the loading and the very short time involved in these experiments, the level of uncertainty in the results cannot be overlooked. While a persisting challenge lies in linking MD-obtained results from ideal simulation setups to those of experiments, MD presents an advantage in the attainable high strain rates that it mimics. As such, MD offers a powerful simulation tool for
ZEINA G. EL CHLOUK, MUTASEM A. SHEHADEH, and RAMSEY F. HAMADE are with the Department of Mechanical Engineering, American University of Beirut, Riad El-Solh 1107 2020, Beirut, Lebanon. Contact email: [email protected] Manuscript submitted December 06, 2019.
METALLURGICAL AND MATERIALS TRANSACTIONS A
investigating materials plastic deformation that is governed by the nucleation, multiplication, and motion of dislocations. The mechanism of induced plasticity is believed to be largely dependent on temperature and rate of deformation whereby thermal activation or phonon drag mechanisms may dominate or coexist depending on the loading conditions.[1] This work considers an application of a bimetallic Al/ Fe interface under compressive loading at extreme conditions of temperatures and strain rates. The plastic response of such a system of interest, along with any intermetallic crystal structures evolution associated with such systems, is considered in this work. While much work has been reported on simulating the plastic response of single and poly crystalline Al and Fe little can be found on multilayered Al/Fe systems. In the work of Gerlich et al.,[2] the microstructure and stress–strain response of aluminum poly- and bi- crystal was investigated using molecular dynamics (MD) simulations. The system was loaded in compression at high strain rate of 108 s1 and temperature ranging between 845 K and 910 K (just below melting) and the average flow stress during the final 5 pct strain was fitted to a thermally activated Arrhenius equation from which the activation energy was then found. In Reference 3 high strain rate (109 and 1010 s1) tensile deformation was applied at low temperatures (150 K and 250 K) to an
aluminum/Metallic glass interface to study its strength and deformation mechanism. It was found that Shockley partial dislocation motion was the dominant deformation mechanism which appears in the aluminum region close to the interface although their activation energy is considerably high. It was also noted that the strain rate has a positive hardening effect on the strength of the interface unlike the temperature which has a soften
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