The liquid-enhanced plasticity and deformation behavior of Cu-Mg-TiC nanocrystalline composite

Cu-Mg-TiC bulk nanocrystalline composites were prepared by mechanical alloy ing, HIP process and hot-rolling. Tensile tests at constant crosshead speed s were carried out using a universal testing machine at several different t emperatures under an argon atmosphere. The elongation drastically increased as the fraction of melt increased, and a maximum normal elongation of abou t 200 % was obtained at temperature where atomic fraction of liquid phase w as about 0.5 and the strain rate sensitivity m was in the range of 0.8 to 1 .0 for every composite. After the deformation, nanocrystalline structures w ith average grain sizes of about 30 arn were retained.