Mechanical Properties of ECAE Nanocrystalline Copper and Nickel
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Bulk nanocrystalline copper and nickel (average grain size ∼ 50 nm) with high purity and density were synthesized by equichannel angular extrusion (ECAE). Both nanohardness and microhardness measurements revealed a significant increase in hardness of the bulk sample. The tensile strength of these materials has been found to be 5-6 times higher than conventional forms and our experiments show that Cu is extremely stable up to temperatures of 100°C and Ni to temperatures of 250°C. The fracture toughness, measured by the value of JIC for nc-copper and nickel have been found to be 21.66 KJ/m2 and 12.13 KJ/m2, respectively which are high for these strength levels.
author list (cited authors)
Bansal, S., Saxena, A. M., Hartwig, T., & Tummala, R. R.