Strengthening in dual-phase structured Mg-Li-Zn alloys

Abstract

Proof stress Rp0.2 of dual-phase α + β structured Mg-Li and Mg-Li-Zn alloys has been inspected in terms of the strengthening contributions of α-and β-phases. The alloys studied with a variable fraction of α-and β-phases have been subjected to compression straining tests, microhardness measurements and structural analysis by EDX and XRD. Alloying with 1.5 wt.% Zn results in the hardening of both α-and β-phases which however exhibit different hardening responses due to different Zn enrichment. The rule of the mixture has been used to interpret Rp0.2 values by taking into account the fraction of α-and β-phases and their strength level represented by their microhardness. Compression stress-strain curves indicate that work hardening of alloys studied depends considerably on the fraction of α-phase and is higher for Zn-containing alloys.K e y w o r d s : Mg-Li, Mg-Li-Zn, dual-phase alloy, solution hardening, ageing, work hardening

Effect of anisotropic microstructure on high-temperature compression deformation of CoCrFeNi based complex concentrated alloy

“…Experimental characterisation of deformation behaviour of materials is complicated by the fact that deformation becomes non-uniform within the tested specimens. This non-uniformity is accompanied with a necking in tension [10][11][12] and barrelling in compression [13][14][15][16][17][18]. Both the necking and barrelling represent local plastic instabilities that depend not only on intrinsic material properties but specimen geometry as well.…”