|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced Thermo-mechanical Characterization of Materials with Special Emphasis on In Situ Techniques
||In-Situ Thermo-mechanical Characterization of Serrated Flow in Nanostructured Binary Mg-Al Alloys
||Marta Pozuelo, Yuan-Wei Chang, Sanjit Bhowmick, Jaime Marian, Jenn-Ming Yang
|On-Site Speaker (Planned)
Serrated flow, also known as the Portevin-Le Chatelier effect, has been extensively investigated in binary Mg-alloys such as Mg-Ag, Mg-Y and Mg-Li alloys. Interestingly, however, this effect has not been observed in Mg-Al alloys. In this work, we reveal the appearance of serrations in nanostructured Mg-Al alloys processed by cryomilling and spark plasma sintering during <I>in-situ</I> SEM microcompression tests at room temperature and strain rates between 2×10<SUP>-3</SUP> and 10<SUP>-1</SUP> s<SUP>-1</SUP>. The observed serrated stress-strain behavior is attributed to the dynamic strain aging by which interstitial O and/or N impurities introduced during cryomilling diffuse and interact with in-grown dislocations during deformation. By making use of <I>in-situ</I> SEM microcompression tests at high temperatures, we aim to determine the optimal temperature and strain rate conditions where serrations appear, which in the end must be avoided for an optimized mechanical performance of structural materials.
||Planned: Supplemental Proceedings volume