| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Compositionally Optimising the Volumetric Contraction of the Liquid-To-Solid Phase Transformation in Multi-Component Alloys – the Minimisation of Solidification Shrinkage |
| Author(s) |
Kevin J. Laws, Henchel Guo, Audrey Thiessen, Aurora Pribram-Jones, Lori Bassman |
| On-Site Speaker (Planned) |
Kevin J. Laws |
| Abstract Scope |
Originally it was Frank (1952) that proposed that metallic liquids exhibit energetically favourable, efficiently-packed short-range atomic structures, allowing for extended undercooling prior to solidification. Following the observations of Stockdale (1935), Hume-Rothery and Anderson (1960) developed these liquid-structure concepts further to explain the regular occurrence of eutectic reactions at simple whole-number constituent ratios in binary alloy systems. In the last 25 years, significant advances have been made in observing and predicting the structure of liquid metals.
In this presentation, advances in compositionally optimising atomic packing density in multicomponent (high entropy) liquid alloys relative to the disordered FCC crystal lattice are demonstrated. Upon solidification, density-optimised alloy compositions exhibit a dramatic reduction in the degree of casting shrinkage and porosity compared to mainstream or more simple alloy compositions. This recent development has far-reaching applications in industrial foundry and die-casting processes, along with other solidification technologies including welding and metal liquid-fusion additive manufacturing. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, High-Entropy Alloys, Copper / Nickel / Cobalt |