Strong and ductile AZ31 Mg alloy with a layered bimodal structure

Abstract

AZ31 Mg alloy was processed by accumulative roll-bonding (ARB) and hot rolling (HR), respectively, followed by annealing. Layered bimodal structures characterized by an alternative distribution of fine-grained layers and coarse-grained layers were obtained in the ARB samples, while mixed bimodal structures were achieved in the HR samples. The ARB samples have superior combinations of high strength and good elongation compared to the HR samples, indicating a clear effect of layered bimodal structures on mechanical properties of the alloy. The strength of the ARB samples is related to the grain size; while the ductility is attributed to the activity of non-basal slip and the strong backstress.

Effect of Temperature on the Mechanical Properties and Deformation Mechanism of a High Mn Steel With Composite Structure

“…where σ YS is the yield stress, σ 0 is the resistance of the lattice to dislocation, K SY is the grain boundary strengthening, and D is the grain size (Lee et al, 2019). It could be observed that the recovered structure as the hard phase and the recrystallized structure as the soft phase (Luo et al, 2019). The soft layer of the recrystallized grains began to plastically deform during tensile test; however, the plastic deformation would be limited by the surrounding hard layer to produce strengthening from a constraint effect (Wang et al, 2018c).…”

Regulating Precipitates by Simple Cold Deformations to Strengthen Mg Alloys: A Review

“…gradient microstructure, multilayers, bi-model structure etc.) has received more and more attention, because it can balance strength and toughness compared with uniform microstructure [83,84,85,86,87,88]. Thus, design of precipitation distribution by cold deformation and its influence on mechanical properties could be an important research direction in the further study.…”

Transitions in mechanical behavior and in deformation mechanisms enhance the strength and ductility of Mg-3Gd

“…In the research and development of strong and ductile Mg alloys, many routes have been explored encompassing a variety of processing and materials parameters [1,2]. Some examples of the processing routes explored include rolling [3,4], extrusion [5,6], and high pressure torsion (HPT) [7,8]. With regard to materials parameters, example approaches cover both the addition of alloying elements, including rare earths [9][10][11],…”