|About this Abstract
|2022 TMS Annual Meeting & Exhibition
|Ultrafine-grained and Heterostructured Materials (UFGH XII)
|Evolution of Microstresses during Elasto-plastic Transition under In Situ Tensile Loading of Harmonic Structure Materials by Synchrotron X-ray Diffraction
|Elis Sjogren, Wolfgang Pantleon, Ulrich Lienert, Zoltan Hegedüs, Kei Ameyama, Dmyto Orlov
|On-Site Speaker (Planned)
Harmonic structure materials are known for enhanced structural performance without altering chemical composition. They have a bimodal grain-size distribution, with fine grains forming a continuous network enclosing islands of coarser grains. The elasto-plastic transition of such materials under mechanical loading needs to be understood.
Differences in average behavior between coarser and finer grains were investigated in harmonic structure Ni during in situ tensile testing up to 4% strain using high-energy X-rays at the synchrotron beamline P21.2 at PETRA III. For enabling line profile analysis, an algorithm for separating the diffraction profiles originating from the respective grain fractions was developed.
The performed line profile analysis allows new insights on the elasto-plastic transition of harmonic structure materials. For instance, stress partitioning and that each grain fraction has a distinct work-hardening behavior. Moreover, the work-hardening rate of coarse grains within the harmonic structure material is altered compared to homogenous coarse-grained material.