Abstract
A heterostructured Fe71Si15Ti10Cu4 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.
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