Strengthening mechanisms of indirect-extruded Mg–Sn based alloys at room temperature

Abstract

The strength of a material is dependent on how dislocations in its crystal lattice can be easily propagated. These dislocations create stress fields within the material depending on their intrinsic character. Generally, the following strengthening mechanisms are relevant in wrought magnesium materials tested at room temperature: fine-grain strengthening, precipitate strengthening and solid solution strengthening as well as texture strengthening. The indirect-extruded Mge8Sn (T8) and Mge8Sne1Ale1Zn (TAZ811) alloys present superior tensile properties compared to the commercial AZ31 alloy extruded in the same condition. The contributions to the strengthen of MgeSn based alloys made by four strengthening mechanisms were calculated quantitatively based on the microstructure characteristics, physical characteristics, thermomechanical analysis and interactions of alloying elements using AZ31 alloy as benchmark.

Microstructures and mechanical properties of as-ECAPed Mg–8Sn alloys with the combined addition of Zn and Al

“…41 As a result, the smallest AGS in TZA862 corresponded to the strongest grain boundary strengthening effect among the alloys. Using a k value of 300 MPa lm À1/2 , which was obtained from Mg-Sn-based alloys subjected to indirect extrusion, 42 the increases in YS due to grain refinement from 2.86 (TZA852) and 4.76 (TZA872) to 2.44 lm (TZA862) were approximately 14.7 MPa and 54.6 MPa, respectively.…”

High temperature oxidation behavior of Mg-Y-Sn, Mg-Y, Mg-Sn alloys and its effect on corrosion property

“…Because of its own nature properties [23], corrosion current density of Mg-Sn is relatively lower. But after oxidation, the Table 3 Comparison of results of potentiodynamic polarization tests of the as-cast Mg-Y-Sn, Mg-Y and Mg-Sn alloys, and with and without oxide film alloys.…”

Microstructural Characteristics and Mechanical Properties of a Novel Extruded Dilute Mg–Sn–Mn–Ca Alloy

“…Therefore, relativity high texture intensity of 9.23 for the studied alloy is advantageous to the improvement of tensile strength in a certain degree. Many previous studies have reported that the nanoscale particles dynamically precipitated during extrusion can obstruct dislocation slip based on the Orowan mechanism (Stanford and Barnett, 2008;Tang et al, 2011;Cheng et al, 2014;Qi et al, 2014;Wang et al, 2016). However, the total fraction of the precipitates in the studied alloy is relatively low, and it was not clear whether this effect should be considered.…”

“…In general, the TYS of wrought Mg alloys is associated with grain size and orientation, as well as precipitates. The relationship between the grain size (d) and the yield strength is described using the Hall-Petch equation as follows (Cheng et al, 2014(Cheng et al, , 2017a:…”