| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Continuous Phase Transformations
|
| Presentation Title |
Short-range Clustering and Ordering Evolution of Ni-22Cr-13Mo Alloy |
| Author(s) |
Po-Cheng Kung, Jessica Anne Krogstad |
| On-Site Speaker (Planned) |
Po-Cheng Kung |
| Abstract Scope |
The ability to predict short-range clustering (SRC) and ordering (SRO) structures enables mechanical properties tailoring in Ni alloys by precipitation hardening and glide plane softening. In present work, a short-range structure was found in the quenched Ni-22Cr-13Mo alloy (Hastelloy C22). The additional weak electron diffraction spots caused by this structure have been reported in another Ni-Cr alloy and referred as a consequence of SRO formation. However, in-depth diffraction pattern analysis and atomic resolution scanning transmission electron microscope image show that the weak diffraction in Hastelloy C22 is caused by Mo-rich discs lying in {111} planes. After annealing at 300 °C for 34 days, these disordered clusters grew larger and could eventually become the precursor of Ni<sub>2</sub>(Mo,Cr) SRO, which has been reported in this alloy, if prolong the annealing time or increase the temperature. The continuous evolution of these clusters at high temperature is demonstrated by in-situ electron diffraction experiment. |
| Proceedings Inclusion? |
Planned: |