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Meeting Materials Science & Technology 2020
Symposium Interfaces and Phase Transformations
Presentation Title Study of Strain Rate and Temperature Dependent Behavior of Pseudo-morphic bcc Mg within the Mg/Nb Nanocomposites
Author(s) Manish Jain, Rajaprakash Ramachandramoorthy, Marko Knezevic, Nenad Velisavaljevic, Nathan A. Mara, Irene J. Beyerlein, Johann Michler, Siddhartha Pathak
On-Site Speaker (Planned) Manish Jain
Abstract Scope In this work, interface strain engineering of Mg with Nb was exploited to pseudo-morphically transform hexagonal closed packed (hcp) Mg into a stable body centered cubic (bcc) Mg at ambient pressures. The adjacent Mg/Nb interfaces were spaced within a few nanometers forming multilayered Mg/Nb nanocomposite. Transmission electron microscopy (TEM) and X-Ray diffraction (XRD) studies reveal that in physical vapor deposition (PVD) deposited Mg/Nb multilayers at lower thicknesses of ~5 nm, Mg undergoes an interface strain induced phase transition from hcp to bcc. We performed in situ SEM micro-pillar compression tests at strain rates from 0.001/s to 1000/s and temperatures from -90 oC to 225 oC on Mg (bcc)/Nb 5nm/5nm and Mg (hcp)/Nb 20nm/20nm nanolaminates to compare the responses of hcp vs. bcc Mg under such extreme loading conditions. Results from these tests are analyzed in terms of the measured activation energies and activation volumes from sub-micrometer sized Mg/Nb multilayer nanocomposites.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Phase Field Dislocation Dynamics Model in Heterogeneous Crystalline Media
Computing the Free Energy and Mobility of Cylindrical Interfaces
Localized Phase Transformation at Interfaces – A New Alloy Design Strategy
Microstructure and Mechanical Properties of Pre-aged Thermo-Mechanically Processed NiTiHf Shape Memory Alloy
Phase Transformations in High-Temperature Industrial Applications: An Experimental and Computational Study of Nitridation in Commercial Austenitic Stainless Steel
Refining Alpha Microstructure via Dual-phase Interface and Twin Boundary in Beta Titanium Alloys
Shear-mediated Interfacial Structure Evolution in Nanoscale FCC Gold
Study of Strain Rate and Temperature Dependent Behavior of Pseudo-morphic bcc Mg within the Mg/Nb Nanocomposites

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