Microstructure and Plastic Properties of Mg-Li Alloys Smelted in Vacuum Induction Furnaces after Hot Working

Abstract

The paper analyses the characteristics of plasticity and microstructure of magnesium alloys with lithium meant for hot plastic working with different lithium content. The alloys were prepared in conditions of vacuum smelting. Achieved ingots were subject to hot extrusion. Tests on Gleeble simulator were conducted to assess the susceptibility of tested alloys to plastic forming in conditions of hot plastic working. For tested alloy the activation energy was marked for hot plastic deformation and plasticity characteristics in function of Zener-Hollomon parameter. After the analysis of the influence of temperature on the deformability of tested alloys it was stated that the alloy containing 8%Li (LAZ831) has better susceptibility to plastic treatment than alloy containing 4%Li (LAZ431), but higher than in case of classic magnesium alloys -AZ31.

The Promise of Mg-Li Based Alloys for Biomedical Implant Materials

“…Whereas, alloys with higher Li had lower strength but higher elongation and were more corrosion resistant [41]. Extruded AZ31 and those with 4 and 8 wt.% Li had lower tensile strength (250, 215, 179 MPa) and higher elongation (0.12, 0.18, 0.35) respectively [42]. It was also observed that the addition Li decreased recovery temperature and improved formability of magnesium alloys.…”

Archives of Metallurgy and Materials

“…Calculation of the hot deformation activation energy from experimental σ p -values on the basis of the hyperbolic-sine Eq. ( 1) is an established method that was successfully applied for different types of materials, recently for example for various types of steel [11][12][13], intermetallic compounds [14], alloys based on copper [15,16], titanium [17,18] or magnesium [19,20], etc. The use of the peak stress σ p seems to be physically justified in this case, because for different Z-parameter values it corresponds to qualitatively similar structural states given by the initiation of dynamic recrystallization; similarly, in the case of the stress σ ss (MPa) corresponding to steady state.…”