Temperature dependence of elastic constants of lotus-type porous copper

We studied temperature dependence of anisotropic elastic constants of lotus-type porous copper that consists of unidirectionally aligned pores and the matrix of oriented crystallites. All the independent elastic constants were measured from room temperature to 400 °C using an electromagnetic acoustic resonance method. All the elastic constants decrease with increase of temperature. The porosity and oriented crystallites have the influence on the temperature dependence of the elastic constants. Micromechanics theory allows calculation of the temperature dependence of the elastic constants of lotus copper from those of monocrystal copper and shows agreement with the measurements. It is concluded that micromechanics model is then valid to predict the temperature dependence of the elastic constants of the lotus-type porous metals.