- Post Doctoral
MIT Unit Affiliation:
- Materials Science and Engineering
Post Doc Sponsor / Advisor:
Date PhD Completed:
- Experienced in solid mechanics, continuum mechanics, plasticity, crystal plasticity, finite element methods (FEM), molecular dynamics (MD) simulations, Monte carlo (MC) methods, nano-scale metallic composites, thin films, nanoporous materials, multiscale modeling of materials, computational solid mechanics, mathematical modeling.
- Excellent communication/presentation skills, strong ability to work in multidisciplinary environments, and robust leadership abilities.
- Over 4 years of professional experience in minerals and metals industries.
- More than 30 journal publications and conference presentations.
- Recipient of several national/international awards and scholarships.
Expected End Date of Post Doctoral Position:
- Materials design through interface engineering
- Multiscale modeling of the dislocation mechanisms of nanoscale metallic materials.
- Computational design of large composite nanowires with pseudoleastic properties using atomistic simulations.
- Investigating the strengthening mechanisms of core-shell nanoporous metallic materials
Nanoscale metallic multilayers (NMM) have very high strength approaching a fraction of the theoretical limit. Their increased strength is attributed to the high interface density and is limited by the interfacial strength. As the density of interfaces increases (due to smaller layer thicknesses) the strength of NMM structures becomes increasingly determined by the specific nature and properties of the interfaces and is most likely controlled by the nucleation of dislocations from the interfaces. With focus on material systems with incoherent interfaces, we performed MD simulations to determine the controlling deformation mechanisms at different length scales for Cu–Nb multilayers under biaxial tensile deformation conditions. The results of the simulations show that there is a transition in the operative deformation mechanism in NMMs from Hall–Petch strengthening for the length scales of sub microns to microns, to individual dislocations confined to glide in individual layers for few nm to few tens of nm, and dislocation-nucleation-controlled models for less than few nanometers. Based on these results, I developed a Molecular dynamics-based rate-sensitive model for viscoplastic flow which describes the anisotropic deformation behavior of NMMs at different length scales.
Top 5 Awards and honors (name of award, date received):
5 Recent Papers:
Vattré, A. J., Abdolrahim, N., Kolluri, K., and Demkowicz, M. J., “Computational design of patterned interfaces using reduced order models”, Scientific Reports, DOI: 10.1038/srep06231, 2014.
Abdolrahim, N., Zbib, H.M., Bahr, D.F., “Multiscale modeling and simulation of deformation in nanoscale metallic multilayer systems”, International Journal of Plasticity, DOI: 10.1016/j.ijplas.2013.04.002, 2014.
Shao, S., Abdolrahim, N., Bahr, D. F., Lin. G., Zbib, H.M., “Stochastic effects in plasticity in small volumes”, International Journal of Plasticity, DOI: 10.1016/j.ijplas.2013.09.005, 2014.
Abdolrahim, N., Bahr, D.F., Revard, B., Reilly, C., Ye, J., Balk, T.J., Zbib, H.M., “The mechanical response of core-shell structures for nanoporous metallic materials”, Philosophical Magazine, DOI:10.1080/14786435.2012.731528, 2013.
Abdolrahim, N., Mastorakos. IN., Zbib, H.M., “Deformation mechanisms and pseudoelastic behaviors in trilayer composite metal nanowires” Physical Review B, DOI:http://dx.doi.org/10.1103/PhysRevB.81.054117, 2010.