Strengthening Mechanisms of Magnesium-Lithium Based Alloys and Composites

Abstract

Mg-Li based alloys are widely applied in various engineering applications. The strength of these alloys is modified and enhanced by different strengthening mechanisms. The strengthening mechanisms of these alloys and their composites have been extensively studied during the past decades. Important mechanisms applied to strengthening the alloys include precipitation strengthening, solution strengthening, grain and subgrain strengthening, and dislocation density strengthening. Precipitation and solution strengthening mechanisms are strongly dependent on composition of the alloys and thermal treatment processes, whereas grain and subgrain and dislocation density strengthening mechanisms majorly depend on thermomechanical processing. In this paper, recent studies on conventional processes for the strengthening of Mg-Li based alloys are summarized as they are critical during the alloys design and processing. Main strengthening mechanisms are objectively reviewed, focusing on their advantages and drawbacks. These can contribute to enhancing, initiating, and improving future researches for alloys design and suitable processing selection.

Synthesis of Mg Alkoxide Nanowires from Mg Alkoxide Nanoparticles upon Ligand Exchange

“…The binary Mg 0.8 Li 0.2 alloy consists of a dual α-Mg phase and β-Li phase. 21 A good agreement of the position of Mg 0.8 Li 0.2 alloy XRD peaks with Rod-like alloy grains were observed in Mg 0.8 Li 0.2 alloy, which is commonly found in eutectic alloys (Figure 1c). The elements of Mg and O (which indicates the position of Li) were distributed homogeneously according to the EDS results (Figure S1).…”

“…Scanning electron microscopy (SEM) shows the average diameter of the alloy grain of 30–40 μm with well-defined elongated geometry. The binary Mg 0.8 Li 0.2 alloy consists of a dual α-Mg phase and β-Li phase . A good agreement of the position of Mg 0.8 Li 0.2 alloy XRD peaks with Li 0.184 Mg 0.816 (ICDD Card No.…”

Conversion of Mg‐Li Bimetallic Alloys to Magnesium Alkoxide and Magnesium Oxide Ceramic Nanowires

“…High lithium content in MgLi alloys has afavorable effect on the ductility and toughness of otherwise hardly deformable hexagonal a-Mg (hcp) phase.M icrohardness measurements for b-Mg 0.5 Li 0.5 and a-Mg 0.9 Li 0.1 alloys revealed Vickers hardness values of 197 and 1044 HV,r espectively,w hich is in ag ood correlation with reported data [17,18] and suggests that Mg 0.5 Li 0.5 is more prone to plastic deformation than Mg 0.9 Li 0.1 . Thea nalysis of the microstructure of the Mg 0.5 Li 0.5 and Mg 0.9 Li 0.1 alloys reveals grain sizes of 15-30 mmand 30-50 mm, respectively,f eaturing Li-rich grain boundaries (Figure 1b,c,e,f).…”

“…It is known that Mg-Li alloys with higher Li content exhibit increased ductility and reduced strength and, vice versa, the low Li content leads to the increased strength and decreased ductility. [17,18] Thepropagation of the reaction front (and significant volume increase in NWs compared to Mg metal) exposes the surface of alloy to the constant tensile stresses.P rovided that NWs growth proceeds inward the center of the grain, the softer Mg 0.5 Li 0.5 alloy might be more prone to deformation and the formation of the cracks that facilitate NW growth (Figure 2g). Furthermore,l arger content of the dissolving Li atoms provides more space for atomic rearrangement and partial accommodation of the volume increase,w hich should also accelerate NW formation.…”

Bioabsorbable Osteofixation Materials for Maxillofacial Bone Surgery: A Review on Polymers and Magnesium-Based Materials

“…These alloys can be binary, ternary, or more, and the components and composition of the alloys significantly contribute to different mechanical properties and corrosion behavior [ 13 ]. The addition of lithium to Mg alloys can enhance ductility by lowering the density of Mg and improving low-temperature toughness [ 100 ]. Lithium was approved by the US FDA to treat bipolar and depressive disorders [ 101 , 102 ].…”