Dmytro Orlov¹, Kei Ameyama²; ¹Lund University, ²Ritsumeikan University

Powder metal technology provides excellent opportunities for bottom-up architechturing high-performance materials including those for energy applications. One example of such is Harmonic-Structured (HS) materials. They can be defined as Heterogeneous (or Gradient) materials with key features including bi-modal distribution of grain sizes forming a continuous 3D skeleton from ultrafine-grains (UFG) filled with coarse-grain (CG) islands. In this talk, the concept of HS materials will be introduced along with reliable routes for fabrication and advantages in structural performance. The latter include a unique behaviour in elastic-plastic transition as well as in strain localisation. The utilisation of HS material design concept will be demonstrated at least for SUS316L steel, which is a material of choice for many applications in energy sector. Compared to a CG counterpart, harmonic-structured SUS316L steel demonstrates 1.5-times increase in strength along with 1.1x increase in ductility giving 1.5x increase in toughness.