Speaker
Description
Positive mixing-enthalpy systems such as Cu-Fe are difficult to process because liquid-phase immiscibility drives phase segregation and weak interfaces during conventional sintering. Building on ultrafast high-temperature sintering (UHS), we introduce ultrafast high-temperature sintering-quenching (UHSQ), where rapid Joule-heating sintering is immediately followed by ultrafast quenching to kinetically freeze a non-equilibrium microstructure. The approach suppresses elemental segregation, limits interfacial diffusion, and promotes a tight Cu/Fe-based interlocked architecture. In Cu-50 vol% Fe55Cr25Mo16B2C2 composites, rapid processing and quenching generate multiphase nanocrystals in the reinforcement and rivet-like nanoscale interfacial features, enabling efficient load transfer and strong interfacial cohesion. The resulting composite reaches ~685 MPa tensile yield strength at room temperature and retains ~290 MPa at 923 K, with ultrahigh hardness (~900 HV average; up to ~1297 HV) and 40–50× higher wear resistance than pure Cu, while maintaining 15–20% IACS electrical conductivity. These results demonstrate that UHSQ extends UHS from fast densification to interface-controlled microstructure engineering, providing a scalable route for high-performance immiscible metallic composites for tribological and high-current applications.
| Professional Status of the Speaker | Doctoral or Master Student |
|---|---|
| Invitation letter for visa | Yes |
| Interest in submitting a paper in a special issue of | No interest |
