Abstract
Using the bulk cementite (Fe3C, θ) fabricated by mechanical alloying (MA) and spark plasma sintering (SPS), the mechanical properties of cementite such as Young's modulus, hardness and compression strength were measured. The abnormal decrease in Young's modulus and the abnormal increase in hardness with a decrease of temperature were observed at around the Curie temperature. It has been found that the hardness and Young's modulus of the alloyed cementite increased in the order of V, Cr, Mn and Mo. At elevated temperatures, cementite could deform in compression superplastically to large strain without cracks. Multilayers of cementite and ferrite with the layer thickness less than 100 µm could be fabricated by compression at elevated temperatures and this indicated a cooperative deformation of these two phases.
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