Mechanical properties of K18/Mo nano-laminar materials and their high temperature stability

K18/Mo nano-scale laminar materials have been prepared by the means of EB-PVD, which have layer spacings of about 50, 70, 110 and 130 nm, respectively, and the change of their strengths with bilayer thickness follow the Hall-Petch relation. The microstructure observations showed that the growth of grain size may be controlled by adjusting the layer spacing of nano-scale laminar materials. The mechanical properties of K18/Mo nano-laminar materials at room temperature, after appropriate heat-treatments, have been greatly improved, for example, the strength and strain are over 1000 MPa and 8%, respectively.