Department of Mechanical and Aerospace Engineering (MAE) Seminar
Olujide (Jide) Oyerinde
MS PhD Candidate – Clarkson University
Will present a talk titled:
Investigating Mechanical Properties and Microstructural Features/Phenomena of the AlCoCrFeNi Family High-Entropy Alloys: Experimental and Computational Analyses
Abstract: Additively manufactured high-entropy alloys (HEAs) are at a critical stage of development, necessitating further research into how their compositions, processing routes, and microstructural evolutions impact their mechanical properties and deformation behaviors. This talk provides critical insights into the microstructural features/morphology, diffusion phenomena, and evolution of AlCoCrFeNi HEA produced via two additive manufacturing techniques: binder jetting 3-D printing (BJ3DP) and directed energy deposition. The study further delves into the mechanical failure of the versatile AlCoCrFeNi alloy, focusing on the undesired granular failure that hinders the HEA’s adoption. Using macro-indentation loading, the research explores how different multi-stage heat-treatment temperatures can control deformation behavior. The findings highlight how isothermal multi-stage heat treatments affect the alloy’s hardness and deformation, with subgranular nano-features playing a crucial role in controlling deformation. The multi-stage heat treatment can help prevent catastrophic failure in this HEA. Additionally, the talk examines the CoCrNi alloy, an equiatomic ternary medium-entropy alloy (MEA) with an FCC crystal structure, derived from the Cantor alloy system. The micromechanical behavior of this MEA is modeled using an Elastic Viscoplastic Fast Fourier Transform (FFT) model, calibrated with experimental data to determine parameters such as dislocation slip resistance and the Baily-Hirsch hardening coefficient. The simulation results, which align well with experimental stressstrain curves, provide a 3D visualization of in-grain stress-strain behavior/distributions, and information about the dislocation density and geometrically necessary dislocations evolution. This modeling helps reveal how key parameters influence the alloy’s properties at the granular level. In ongoing work, the approach is further extended to investigate the microstructure-property relationships in multiphase equimolar AlCoCrFeNi high-entropy alloys (HEA) under compression loading based on the Self-Consistent Elastic-plastic framework.
Date: October 18, 2024
Time: 11:00 am
Location: Snell 212
ZOOM Link for virtual attendance:
https://clarkson.zoom.us/j/93541691606?pwd=cggjBnvRrYbr7mPOCqmmThM0lOOzOd.1
You can access this link by going to the Virtual Class & Recordings tab in Moodle.
Bio: Jide completed his first degree in metallurgical and materials engineering at the University of Lagos, Lagos, Nigeria, and his master’s degree in engineering science at Clarkson University. He is currently pursuing a PhD degree in materials science and engineering at the mechanical and aerospace engineering department. Under the supervision of Prof. Ioannis Mastorakos, Prof. Philip Yuya, and Prof. Ajit Achuthan, Jide researches additively manufactured high-entropy alloys via both experimental and computational approaches. He is a Materials News writer and author for MRS Bulletin journal where he has published some articles. He is a voting member of a metallurgy committee of the Association of Iron and Steel Technology (AIST). He is a multiple-time beneficiary of AIST-sponsored professional training. He is a 2024 travel grant awardee for the Materials Science and Technology (MS&T) international conference in Pittsburgh Pennsylvania. He also served as a session Chair of the Microstructural Characterization/Alloy Development session at the MS&T’24 conference. He has presented his studies at a number of top international conferences such as the Materials Research Society (MRS), The Minerals, Metals, and Materials Society (TMS), MS&T, and ASM International. He won 2nd place in the recent ASM International IMAT /IFHTSE World Congress 2024 student/emerging researchers’ competition in Cleveland Ohio. He currently serves as the president of Clarkson University’s material advantage club. He is an active student member of MRS, TMS, AIST, ASM International, Heat Treating Society (HTS), and ASTM International engineering professional organizations. Engineering was Jide’s childhood dream, and he was specifically motivated to graduate studies in materials engineering after, in a physical metallurgy class, he stumbled on the answer to his questions about why the Titanic (ship) metallic body frame failed unexpectedly. Jide loves arts, computer graphics, volunteering, and playing chess and volleyball. Jide’s favorite quote is “I live to serve God and humanity”.