Damping properties of homogenized and cold-rolled Mg14.3Li0.8Zn β-phase magnesium alloy

Abstract

As-homogenized β-phase Mg14.3Li0.8Zn (LZ141) alloy exhibits a P1 peak and a conspicuous high-temperature damping background (HTDB) in the heating internal friction Q -1 curves. Cold-rolled LZ141 alloy with 80% thickness reduction exhibits a significant P 2 peak in the Q -1 curves due to the recrystallization process during heating. The activation energy (H) of the HTDB for as-homogenized LZ141 alloy is 1.44 eV, decreasing to 0.91 eV after 80% cold-rolling. These H values for β-phase LZ141 alloy are lower than those for α-phase AZ80 alloy. Cold-rolled LZ141 alloy exhibits extremely high damping capacity at temperatures around the P 2 peak. © 2012 The Japan Institute of Metals.