A heterostructured Fe71 Si15 Ti10 Cu 4 ultrafine composite has been developed. The addition of Cu with large positive enthalpy of mixing with the main constituent element (Fe) leads to evolution of a unique microstructure with different length-scale heterogeneities, i.e., formation of spherical colonies containing length-scale heterogeneity of lamellar spacing and precipitation of nanoscale multitwinned Cu within α-Fe layers. These macroscopic and microscopic structural heterogeneities are able to simultaneously achieve high strength and plasticity, together with pronounced work hardening by avoiding the deformation instability.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)