Jaime Marian
University of California-Los Angeles, CA·Materials Science
Jet engines, hypersonic vehicles and nuclear systems need metals that stay strong at temperatures beyond what steels or nickel alloys can handle. 'High-entropy' alloys offer one route.
- Fields
Materials Science
Engineering
- Topics
high-entropy alloys
refractory multi-principal element alloys
refractory metals
- Grants
- 1 known grant, through Jul 2029
What they work on
- Determine how 'necklace' microstructures nucleate at grain boundaries during dynamic recrystallization in body-centered-cubic refractory multi-principal element alloys, using mesoscale modeling.
- Build a model that links local chemical composition and dislocation motion to grain boundary evolution during high-temperature deformation.
- Validate the model with in-situ electron microscopy and micropillar compression tests on samples containing isolated grain-boundary triple junctions, where necklaces preferentially form.
- Test whether grain boundary sliding is an active mechanism during dynamic recrystallization, and use the findings to guide microstructure and composition choices for better high-temperature performance.
More about the research
They mix several metals in roughly equal amounts, instead of using one main metal with small additions. Those built from refractory metals, which have very high melting points, keep exceptional strength at high temperatures. Yet when these alloys are deformed while hot, their internal grain structure can rebuild itself. This process, dynamic recrystallization, can weaken the material and cause failure. This project seeks to understand how that breakdown begins.
Why it matters
Understanding why refractory high-entropy alloys lose strength at high temperature could guide the design of alloys that operate hotter and longer. Such alloys could serve as structural materials for energy and nuclear systems, irradiation-resistant coatings and hypersonic flight. Tools for optimizing alloy composition and microstructure could speed the development of materials for these extreme environments.
Known grants
From NIH and NSF research grants. Labs often have other funding we can't see.
Closest labs
William Musinski
University of Wisconsin-Milwaukee, WI·Materials Science·Early-career
Measure strains inside grains, dislocation substructures and grain boundary interactions before and during fatigue cracking, using synchrotron high-energy X-ray diffraction, which sees inside metals as they deform, together with high-resolution microscopy.
Golden Kumar
University of Texas at Dallas, TX·Materials Science
Decouple the creep mechanisms that govern thermomechanical nanomolding of crystalline metals, including dislocation plasticity, Nabarro-Herring creep, and Coble creep, by systematically varying processing conditions and feedstock.
Qi An
Iowa State University, IA·Materials Science
Build a closed-loop AI platform that compares Bayesian optimization (choosing the most informative next test) with deep reinforcement learning (trial-and-reward learning) for designing the high-entropy carbide (Ti-Zr-Hf-Nb-Ta)C, using machine-learning force-field atomistic simulations.
The school
University of California-Los Angeles: 84 labs on PI Pages, $1.9B a year on research, 803 research doctorates a year.
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