Metals

High-entropy alloys, nanocrystalline alloys, quasicrystals, steels, aluminum, titanium and metallic composites

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Manufacturing

Additive manufacturing (3D printing), cold spray, powder metallurgy, and micro/nano-fabrication

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Mechanics

Multiscale mechanics, in situ instrumentation, and high strain-rate/ temperature deformation, and fracture and failure analysis

Machine Learning

Machine learning for material discovery and Computer vision for advanced manufacturing

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Sample preparation of HEAs: (a) the bulk coarse-grained HEAs produced by arc melting and (c) the inverse pole figure map of the bulk HEAs; (b) the thin-film nanocrystalline (<100 nm grain size) HEAs produced by the magnetron co-sputtering system equipped with four targets arranged in a symmetry, and (d) their inverse pole figure map showing  texture. 

  • Y. Zou, et al. “Nanocrystalline high entropy alloys: A new paradigm in high temperature strength and stability” Nano Letters (2017))

  • Y. Zou, et al. “Ultrastrong, ductile and stable high-entropy alloys at small scales” Nature Communications 6 (2015).

  • Y. Zou, et al., “Size-dependent plasticity in an Nb25Mo25Ta25W25 refractory high-entropy alloy” Acta Materialia (2014)

Metallic Materials

Design of high-strength and thermally stable alloys using novel fabrication and testing techniques.

 

Study structure-property relationship from Simple Ionic Crystals to Complex Intermetallic Phases

Multiscale Mechanics 

  • Mechanics: multiscale mechanics, in-situ instrumentation, and high strain-rate/temperature deformation

  • More details coming soon...

 
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SEM in situ nanomechanical testing system (left) and standalone nanoindenter system (right) 

Additive Manufacturing

  • Manufacturing: metal additive manufacturing (3D printing), cold spray technology, powder metallurgy, and micro- and nanofabrication

  • More details coming soon...

 

Steel (left) and titanium (right) samples produced by additive manufacturing

 

Machine Learning for alloy design and processing optimization

  • Machine Learning: The rapid development of artificial intelligence (AI), intelligent methods have been widely applied in materials science research and manufacturing processes. Our group is seeking novel approaches to use AI for material discovery and the optimization of manufacturing processes, particularly on machine learning for mechanics of materials, alloy design, topological/microstructure optimization, and in-situ monitoring.

A computer vision approach to evaluate powder flowability for metal additive manufacturing

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Additive manufacturing process monitoring : (a) experimental setup (b) our proposed vanilla model (c) class-discriminative maps of the melt pool

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 Detection and classification deep learning model for the melt tracks