|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||In Operando Nano- and Micro-mechanical Characterization of Materials with Special Emphasis on In Situ Techniques
||Exploring the Mechanical Behavior and Microstructure Evolution of Twin-twin Junctions in Mg by In Situ Compression
||Yue Liu, Nan Li, Jian Wang, Rodney J. Mccabe, Yanyao Jiang, Carlos N. Tomé
|On-Site Speaker (Planned)
Deformation twinning is an important deformation mode in hexagonal closed packed (HCP) metals because they have a limited number of easy slip systems and, as a consequence, limited formability. Frequently, multiple twinning variants are active in individual grains. Interactions of the variants create twin-twin junctions that contribute to hardening, and upon reverse loading can hinder detwinning due to pinning effects. However, the junction barrier strengths and stresses necessary for depinning remain unknown, information that is important for fully understanding the effects of twinning and detwinning on plastic deformation. We perform in situ compression of micro-pillars containing different types of twin-twin junctions in a scanning electron microscope in order to measure stresses associated with twin barrier formation and depinning. We find that the junction strengths and depinning resistance depends on the specific variants associated with the junctions.
||Planned: A print-only volume