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Mechanical Engineering

Faculty Mentor:  Dr. Ebrahim Asadi

Faculty Mentor's Department:  Mechanical Engineering

Telephone Number and/or E-mail:  901-678-3332, easadi@memphis.edu

Project Description: Particle coarsening is one of the diffusional material processes wherein larger particles grow at the expense of smaller particles, leading to a reduction in the total surface area, and thus a reduction in the total free energy of the system. Example material/metallurgical processes include coarsening of solid precipitates in Ni-Al turbine blades working at high temperatures (limiting the lifetime of turbines) and liquid phase sintered materials where particle coarsening strongly influences the resultant microstructure and properties. Therefore, there has been an extensive effort to explain, understand, and/or to take advantage of the kinetics and mechanism of particle coarsening. NASA "coarsening in solid-liquid mixtures experiments (CSLM)" is one such effort that was aimed to better understand particle coarsening in liquid mixtures by investigating coarsening of solid Sn-rich particles in eutectic Pb-Sn liquid mixture at constant temperature slightly below the eutectic temperature. The objective of this project is to develop predictive computational materials model to predict this phenomenon quantitatively and qualitatively and test its accuracy by comparing the computational results to NASA's CSLM experiments. The undergraduate student researcher will work as a team member in this on-going project and will be tasked on quantification of a novel material model called phase-field crystals (PFC) by a combination of MATLAB and COMSOL software.

Requirements for Student Applicants: Major in Mechanical Engineering, Physics and Materials Science or other related fields with good academic standing; familiar with MATLAB, COMSOL, and Crystallography; have passion about applied mathematical models and partial differential equations; experience with parallel computing is desired.

Application or Interview Process:  Interested applicant should send a cover letter and unofficial copy of transcripts to Dr. Asadi. Selected candidates will be interviewed before selecting the final candidate for this research position.

Starting Date: August 27, 2018

Hours per week: 10-15

Method of Compensation: Federal Work Study

 

Faculty Mentor: Dr. Ebrahim Asadi

Faculty Mentor's Department: Mechanical Engineering

Telephone Number and/or E-mail: 901-678-3332, easadi@memphis.edu

Project Description: Direct Metal Laser sintering (DMLS) is the basis for most of the common additive manufacturing (AM) techniques to fabricate functional metal parts by layer-by-layer scanning of fine metal powders using a high-energy laser at a prescribed scan pattern. The possibility of rapid manufacturing of complex-shape and fully functional parts directly from metal powders, without using any intermediate binders nor rough post-processing, is such an exciting possibility provided by DMLS that cannot be matched by any traditional manufacturing technologies. However, the broader acceptance of DMLS as a viable manufacturing technique for metal parts has been significantly hammered due to the issues with the quality and repeatability of the manufactured metal parts. The objective of this project is to determine the variation of mechanical properties and materials microstructure within DMLS-manufactured Ti-6Al-4V parts to improve the quality and repeatability of these parts. The undergraduate student researcher will assist with the on-going activities in Dr. Asadi's lab to design parts as related to medical devices, design the additive manufacturing process, use wire EDM for sample preparation, perform mechanical testing, and conduct microstructure characterizations.

Requirements for Student Applicants: Major in Mechanical Engineering, Biomedical Engineering or other related fields with good academic standing; familiar with G-Codes and have hands-on metal manufacturing experience; passionate about innovations and able to work as a team member; familiarity with wire EDM cutting and additive manufacturing is desirable.

Application or Interview Process: Interested applicant should send a cover letter and unofficial copy of transcripts to Dr. Asadi. Selected candidates will be interviewed before selecting the final candidate for this research position.

Starting Date: August 27, 2018

Hours per week: 10-15

Method of Compensation: Federal Work Study