EFFECT OF ZrO2 ADDITIONS ON FABRICATION OF ZrO2/Mg COMPOSITES VIA FRICTION-STIR PROCESSING

摘要

ZrO2/Mg composites were prepared with friction-stir processing (FSP) using different ZrO2 amounts. The effects of FSP on the microstructure, mechanical properties and damping capacities of ZrO2/Mg composites are discussed in this paper. After friction-stir processing, the central region of the stir zone of a ZrO2/Mg composite obtained fine, uniform, equiaxed crystal grains. An addition of ZrO2 can obviously refine the grains and improve the microhardness and mechanical properties of ZrO2/Mg composites. The ZrO2/Mg composites prepared with friction-stir processing have better damping capacities. During a strain-damping test, the damping behavior of ZrO2/Mg composites follows the Granato-Liicke dislocation damping theory (G-L theory). The ZrO2/Mg composites with a groove width of 0.8 mm had the hest damping capacities.