| Abstract Scope |
Operation conditions in microelectronics, sustainable mobility, and space exploration increasingly demand mastering thermal expansion due to large temperature variations and stringent dimensional tolerances. However, customizing thermal expansion of conventional metallic materials is difficult, with Fe-Ni Invar alloys suffering from a narrow range of low positive coefficients. While negative thermal expansion materials exist, they are typically brittle and non-metallic.
Recent advances demonstrate that thermomechanical processing can tailor thermal expansion of martensitic alloys. Specifically, deformation-induced crystallographic texture enables broad control over macroscopic expansion. Ti-based alloys forming metastable orthorhombic α'' phases are particularly promising due to their giant expansion coefficients, high deformability, and sensitivity to alloying.
This presentation reviews key developments over the past two decades and introduces a novel strategy integrating phase composition, texture, and volume fraction. This approach significantly expands the design space, offering new avenues for alloy development and functional material innovation.
Funding: KU Leuven Internal Funds (STG/23/008) |