About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Microstructural Control in Materials Processing: Role of Phase Transformation Pathways
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| Presentation Title |
Thermo-mechanical processing for significant strength improvements in a NiCoCr-based alloy using a multi-length scale strengthening approach |
| Author(s) |
Martin Detrois, Chang-Yu Hung, Milan Heczko, Chenyang Li, Dallin Barton, Wei Chen, Arun Devaraj, Michael Mills, Paul D Jablonski, Stoichko Antonov |
| On-Site Speaker (Planned) |
Martin Detrois |
| Abstract Scope |
A multi-scale strengthening approach was employed to significantly improve the strength of several NiCoCr-based alloys. First, Mo was utilized to strengthen the alloys though grain size refinement, lattice distortion, and by reducing the stacking fault energy (SFE). Subsequently, Suzuki segregation strengthening was leveraged by controlling stacking fault (SF) density via pre-straining and subsequent heat treatment. Results from tension testing of the Mo-containing alloys following pre-straining and heat-treatment showed yield stresses up to 1.3 GPa representing up to 380% increase compared to the starting material. The mechanisms rely on Mo promoting complex SF interactions while the SFs formed during pre-straining serve as sites for Suzuki segregation during subsequent heat treatment. This varies the local SFE due to Cr segregation which creates a roughened landscape and hinders dislocation dynamics. This multiscale strengthening approach presents a promising route for increasing the mechanical properties of various alloy compositions. |