Effects of annealing temperature on microstructure and mechanical properties of LZ91 alloy

Abstract

Effects of annealing temperature on the microstructure and mechanical properties of cold-rolled LZ91 alloy are investigated. The results indicate that LZ91 alloy is composed of α-Mg, β-Li, MgLiZn and MgLi2Zn phases. The recrystallization of the cold-rolled alloy is completed when annealing at 125°C and a large number of fine equiaxed grains with an average grain size of 3 µm is formed. The cold-rolled LZ91 alloys annealed at 125°C have the optimized comprehensive mechanical properties with the elongation, ultimate tensile strength and microhardness of 56.1%, 157 MPa and 51.2 HV, respectively. With the further increase in annealing temperature, the grain size begins to coarsen, which leads to the decrease in strength and ductility of the alloy.

Enhanced mechanical properties of Mg–Ni–xRE alloys via hot extrusion

“…Lightweight magnesium alloys are extensively used in various industrial applications in both as-cast and wrought conditions [1]. The Mg castings might be produced by several methods such as gravity die casting [2], squeeze casting [3], and high-pressure die casting [4].…”

Phase dissolution strengthens and ductilizes a high-entropy alloy

“…The four constituent elements in each projected atomic column do not fluctuate randomly. We can observe one atomic [52][53][54], magnesium alloys [55][56][57], pure metals [58][59][60], nickel alloys [61], molybdenum alloy [62], and zirconium alloy [63]. The properties of strength and ductility obtained after HTA and LTA are denoted as Y HTA and Y LTA , respectively.…”

“…(b) Corresponding strain-hardening response for the annealed TiZrNbTa HEAs. (c) Changing rate of yield strength versus that of elongation with the increase in annealing temperature for the introduced TiZrNbTa HEAs relative to other reported HEAs [6,[31][32][33][34][35][36][37][38][39], steels [3,[40][41][42][43][44], copper alloys[45][46][47][48], aluminum alloys [5,[49][50][51], titanium alloys [4,[52][53][54], magnesium alloys[55][56][57], pure metals[58][59][60], nickel alloys[61], molybdenum alloy[62], and zirconium alloy[63]. The properties of strength and ductility obtained after HTA and LTA are denoted as Y HTA and Y LTA , respectively.…”

Tailoring the tensile properties of AZ91 magnesium alloy via grain refinement

“…In recent years, lightweight magnesium alloys have attracted increasing interest for various industrial applications [1][2][3], especially the renowned Al-and Zncontaining AZ alloys [4]. Owing to its good casting properties, AZ91 (Mg-9Al-1Zn) is the most sought alloy [5].…”