Abstract
Multi-pass caliber rolling has proven its vast potential for ultrafine-scale grain refinement and mass production of various metals. Nevertheless, the studies related to Mg alloys have primarily focused only on a few commercial materials, such as AZ31 and ZK60 Mg alloys. This is the first study to investigate caliber-rolled Mg–1Sn (TM10) and Mg–1Sn–1Mn (TM11) alloys. Specifically, this work aims to elucidate the microstructural characteristics of these alloys, including grain refinement, recrystallization, and texture development. Such features were discussed from the viewpoints of alloying effects (i.e., Sn and Mn) and mechanical effects (i.e., caliber-rolling strains). The combination of the addition of Mn and high-redundant strain results in effective grain refinement of the caliber-rolled TM11 Mg alloys. In addition, both TM10 and TM11 Mg alloys exhibit a unique split basal texture, wherein the basal poles are tilted in the plane normal to the rolling direction.
Highlights
Light-weight Mg alloys have attracted significant attention from the automotive industry, whose objectives are to enhance fuel efficiency and comply with environmental regulations [1].To facilitate extensive applications of Mg alloys, researchers have endeavored to resolve various issues related to these alloys, such as low strength, poor formability, and low corrosion resistance.One approach is to develop a new alloying system that includes a variety of rare-earth elements (RE), including Y, Ce, Nd, and Gd
Mg change in in the themicrostructures microstructuresdepending depending strain applied during the caliber rolling (Figure sample showed coarse elongated strain applied during the caliber rolling (Figure 2)
This work investigated the microstructural evolution of TM10 and TM11 Mg alloys subjected to various caliber rolling strains
Summary
Light-weight Mg alloys have attracted significant attention from the automotive industry, whose objectives are to enhance fuel efficiency and comply with environmental regulations [1]. One approach is to develop a new alloying system that includes a variety of rare-earth elements (RE), including Y, Ce, Nd, and Gd. For example, Golrang et al [2] confirmed that the strong grain-refining capability of RE enhanced the mechanical strength of Mg–Zn–Ca–RE alloys; the ultimate tensile strength of an extruded Mg–4Zn–0.5Ca–0.5RE alloy was 3.11 times that of cast Mg. Mg–Zn–Y–RE alloys were proven to possess exceptional mechanical properties owing to the formation of a unique microstructure called “long-period stacking ordered phase” [3]. The beneficial effects of adding RE are applicable for commercial Mg alloys, such as AZ31 and ZK60.
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