|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Multiscale Architectured Materials (MAM II): Tailoring Mechanical Incompatibility for Superior Properties
||Tensile Properties of Heterogeneous Structures Embedded with Nanotwins
||Nairong Tao, F.K. Yan, H.Y. Yi, Y. Zhang, Y.S. Li
|On-Site Speaker (Planned)
Recently, a novel strategy was proposed for strengthening metallic materials by introducing nanotwins. In our work, heterogeneous structures embedded with nanotwins were prepared in various metals including copper and steels by using dynamic plastic deformation and subsequent annealing. The deformation nanotwins with a reduced dislocation density exhibit a high strength and a certain ductility, which makes heterogeneous metals have a high strength and a good ductility. Deformation mechanisms of nanotwins, including interactions of dislocations with twin boundaries, generation of stacking faults and strain-induced martensitic transformation, depend on stacking fault energies and material natures. The occurrence of stacking faults and strain-induced martensitic transformation constrains dynamic recovery of dislocations and deformation localization, thereby contributing significantly to the work hardening and ductility. Our results showed that tailoring heterogeneous microstructures is a potential approach to raise strength and keep good ductility.