Monday  |  Salon 9  |  04:10 PM–04:30 PM

#16009, Mechanism-based Approach to the Conversion of Plastic Work to Heat in Mg AZ31B

The tensile and compressive thermo-mechanical behavior of Mg AZ31B alloy was investigated under dynamic loading conditions using a split-Hopkinson pressure bar (or Kolsky). To promote different deformation mechanisms (e.g., basal slip, deformation twinning) specimens were excised from a rolled block of parent material with different orientations with respect to the parent material’s principle processing directions. A double-Schwarzschild optical system and high-speed camera are incorporated into the split-Hopkinson pressure bar experiments to allow for digital image correlation and infrared thermography of these samples. The real-time temperature measurements and deformation analysis enables the identification and correction of heterogeneous deformation fields occurring in the IR interrogation area. The activation of basal slip, prismatic slip, pyramidal slip, extension, and contraction twinning were investigated through post-mortem EBSD performed at controlled strain increments. Finally, the roles of different deformation mechanisms on the Taylor-Quinney coefficient and stored energy of cold work were shown. It was observed that the loading direction and strain have strong effects on the activated deformation mechanisms, stress-strain behavior, and the stored energy of the cold work.

Seyyed-Danial Salehi   University of Utah
Anthony Lew   University of Utah
Owen Kingstedt   University of Utah