Effects of 2 mass% Li addition on the AZ80 Mg alloy are investigated, including crystal structures, mechanical properties and corrosion resistance. Experimental results show that the density of AZ80 Mg alloy can be reduced to be 1.71 g/cm 3 by addition of 2 mass% Li. Both the AZ80 and AZ80-2%Li Mg alloys exhibit the two-phase microstructure with and phases. Adding 2 mass% Li to AZ80 Mg alloy can obviously increase the ductility and impact toughness, but reduce the corrosion resistance.
In this study, an aging treatment was performed to investigate the microstructures and mechanical properties of Mg-10Li-0.5Zn (LZ101) alloy. Experimental results show that the LZ101 Mg-Li alloy exhibits a dual-phase microstructure of (HCP) and (BCC) phases, and has a good ductility. The 723 K solid-solution treated LZ101 Mg-Li alloy exhibits a single structure and produces precipitates after natural and artificial aging. The solid-solution treated specimen has lower mechanical strength and higher elongation than the as-extruded one. The aged specimens exhibit a typical behaviour of precipitation hardening. The maximum tensile strength can reach 188 MPa, 180 MPa and 173 MPa, corresponding to the natural aging of 345.6 ks, 423 K aging of 21.6 ks and 523 K aging of 10.8 ks.
In this study, the effects of T5 treatment on the microstructure and mechanical properties of Mg-8Al-2Li specimens are investigated. The experimental results show the T5-treated Mg-8Al-2Li specimens will produce the -Mg 17 Al 12 and/or AlLi precipitates depending on the aging temperatures. The T5-treated Mg-8Al-2Li specimens will display an obvious precipitation strengthening, regardless of whether the precipitates are single -Mg 17 Al 12 phase or dual phases of AlLi and Mg 17 Al 12 . Their maximum tensile strengths can reach 355-375 MPa, which are 12-18% increment compared with that of the as-extruded specimen. Meanwhile, the T5-treated Mg-8Al-2Li specimens can still show good ductility with $9% elongation for specimens with their maximum strengths.
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