Effects of low temperature aging precipitates on damping and mechanical properties of ZK60 magnesium alloy

Effects of low temperature aging precipitates on damping and mechanical properties of ZK60 alloy are investigated by transmission electron microscopy, tensile testing and dynamic mechanical analysis. The results show that the mechanical properties of ZK60 alloy can be significantly improved by solution and ageing treatment, at the same time, the strain-amplitude-dependent damping capacity increased absolutely. The ZK60 alloy aged at 115 degrees C for 2 h exhibits higher mechanical properties (UTS of 232 MPa, YTS of 89 MPa, El of 11%) and better high strain-amplitude-dependent damping capacity than the as-cast and the solution-treated alloys, which is a promising damping magnesium alloy. The favourable damping capacity and its growth at medium high strain amplitude are closely connected with G.P.I zone, which is considered as a new energy-dissipation source. The damping capacity improvement can be explained by the self-modified Granato-Lucke model. (C) 2019 Elsevier B.V. All rights reserved.