2021/06/23 by Yi Xiong, Xiong Yi, Nicolo Grilli +13
Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Intermetallics and Advanced Alloy Properties #Materials Science (cond-mat.mtrl-sci) #Microstructure and mechanical properties #Titanium Alloys Microstructure and Properties #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.2106.12227
arxiv created 2021/06/23 · openalex publication_date 2021/06/23 · arxiv updated 2021/06/24 · openalex created_date 2021/07/05 · openalex updated_date 2026/07/28
Digital image correlation (DIC) and crystal plasticity simulation were utilised to study cold dwell behaviour in a coarse grain Ti-6Al alloy at 3 different temperatures up to 230 C. Strains extracted from large volume grains were measured during creep by DIC and were used to calibrate the crystal plasticity model. The values of critical resolved shear stresses (CRSS) of the two main slip systems (basal and prismatic) were determined as a function of temperature. Stress along paths across the boundaries of two grain pairs, (1) a `rogue' grain pair and (2) a `non-rogue' grain pair, were determined at different temperatures. Load shedding was observed in the `rogue' grain pair, where a stress increment during the creep period was found in the `hard' grain. At elevated temperatures, 120 C was found to be the worst-case scenario as the stress difference at the grain boundaries of these two grain pairs were found to be the largest among the three temperatures. This can be attributed to the fact that the strain rate sensitivity of both prismatic and basal slip systems is at its greatest in this worst-case scenario temperature.