Processing And Properties Of TZM310 Alloy By Accumulative Roll Bonding

Magnesium alloy is one of the widely used light metal, it has many unique excellent performances, such as rich reserves, light weight, easy forming and good biocompatibility.Magnesium alloy has important effect in the application value. But as a structural material,compared with other structural materials, the ductility and strength of magnesium are relatively low.In order to solved the low strength of Mg-3Sn-1Zn-0.5Mn (TZM310) alloy, the TZM310 alloy through five processed rolling, optimized a TZM310 alloy plate which has high strength and good combination properties, and to researched the texture influence of the rolling process was studying in this paper. TZM310 alloy plate processing was using Accumulative Roll-Bonding (ARB), through the influences of precipitate phase and grain refinement to improve the strength. Behaviors of the microstructure and the precipitate phase of TZM310 alloy was observed by optical microscopy, scanning electron microscopy,transmission electron microscopy and XRD, the relationship between mechanical properties and microstructure for rolling state and ARB state was discussed.The result was shown that, with the increase of rolling passes, dynamic recrystallization appears in grain boundaries and twins, original grain lengthen alone with rolling direction, the size of grain decrease. When the reductions reached 88.2% in rolling processing, all places were dynamic recrystallization grain in plate, means entirely dynamic recrystallized. From the SEM picture, position of the Mg2Sn phase precipitation as followed at grain boundaries, dislocation, twins and grain in the rolling process, and then dispersed in the grain boundary and grain. The shapes of the Mg2Sn phase were spherical,and Mg2Sn phase distributed in the grain boundary and grain in the rolling process. The Mg2Sn phase rolling in the 300? had more quantity, smaller and distributed more diffuse, enhanced the effect of pinning the grain boundaries. Both grain refinement and precipitation strengthening enhance the mechanical strength and hardness of the TZM310 alloys.TZM310 plate grain refinement mainly occurred in the initial cycle. During the following ARB cycles, the homogeneity of the microstructure was improved while the grain size didn't change obviously. With the ARB rolling passes gradually rising, the tensile strength of TZM310 alloy increased, the rate of increased strength decreased, and the elongation decreased. Due to the plate dynamic recrystallization and between different ARB passes annealing cause that the grain refinement was not obvious, so the rate of increased strength was decreased. TZM310 plate last time the mechanical properties of the interface for the ARB plate weakest subsequent deformation method was still necessary to improve its bonding strength.