|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||L-149: Solute Atoms Enhance Tensile Ductility in a Nanostructured Al-Mg Alloy
||Yaojun Lin, Shulei Li, Zhigang Yan, Haiming Wen, Enrique J. Lavernia
|On-Site Speaker (Planned)
Nanostructured materials exhibit ultra-high strength but low ductility. In order to solve this problem, various approaches have been developed, which have their own advantages and disadvantages. In this talk we propose a new approach: using solute atoms to pin and entrap dislocations and thus to enhance work hardening ability and ductility. In the present work, nanostructured Al-Mg alloy 5083 was prepared via accumulative-rolling bonding followed by well-controlled annealing. During room-temperature uniaxial tensile testing, the nanostructured 5083 Al achieves a uniform elongation as high as approximately 13% and simultaneously a yield strength of approximately 350 MPa. Microstructural observation reveals the absence of intragranular second-phase particles, and 3.8 wt.% of Mg solute is estimated based on the X-ray diffraction pattern, indicating that the high ductility is attributed to the presence of solute Mg atoms. The effect of solute atoms combined with preexisting dislocations and grain size on ductility is discussed.
||Planned: Supplemental Proceedings volume