About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Phase Transformations and Microstructural Evolution
|
Presentation Title |
H-14: Heterogeneous Martensitic Nucleation of Single Microparticles Irradiated by Helium Ions |
Author(s) |
Juan Carlos Lago, Adelaide Bradicich, Yongchang Li, Woohyun Cho, Daniel Salas, Ibrahim Karaman, Lin Shao, Patrick Shamberger |
On-Site Speaker (Planned) |
Juan Carlos Lago |
Abstract Scope |
Helium ion irradiation impacts reversible martensitic transformations by creating vacancies and interstitials, helium bubbles, and amorphous regions, which can impede phase transformation. However, lesser extents of irradiation damage may introduce defects and residual strain, which can be used to engineer desired transformation temperatures and hysteresis widths. In this study, a low displacement per atom values of 0.0025 to 0.1 are investigated using nucleation site potency distributions and compared to a control group of unirradiated small particles (less than 40 µm in diameter). Our use of small particles allows us to quantify the effects of irradiation on heterogeneous nucleation barriers, thermal hysteresis, and friction-induced losses in phase boundary movement. We use SQUID magnetometry to capture phase fraction transformed and transformation temperatures, from which we develop nucleation site potency distributions of unirradiated and irradiated Ni45Co5Mn36.7In13.3 single particles. This investigation clarifies the mechanism by which irradiation damage impacts reversible martensitic phase transformations. |
Proceedings Inclusion? |
Planned: |
Keywords |
Magnetic Materials, Powder Materials, Phase Transformations |