Excellent mechanical properties obtained by low temperature extrusion based on Mg-2Zn-1Al −0.2Mn-0.2Ca-0.2Gd alloy

Publication date: 15 September 2019Source: Journal of Alloys and Compounds, Volume 801Author(s): Yanxia Niu, Zetian Song, Qichi Le, Jian Hou, Fangkun NingAbstractA newly developed low Al containing magnesium alloy, Mg-2Zn-1Al-0.2Mn-0.2Ca-0.2Gd (wt.%) shows excellent mechanical properties. The alloys with superior high strength and considerable ductility (the maximum of tensile strength reaches 332 MPa and corresponding elongation is 23.1%) were produced by electromagnetic casting and extrusion at relatively low temperatures (110 °C, 170 °C, 210 °C, and 250 °C) with an extrusion ratio of 17.4:1. Effects of extrusion temperature on the evolution of microstructure, mechanical properties and extruded texture were investigated by OM, SEM, TEM, and EBSD analysis. The microstructures of the alloy extruded at low temperatures mainly consist of the equiaxed dynamically recrystallized grains, elongated grains, and regions without dynamic recrystallization. And there are only equiaxed dynamically recrystallized grains in the alloy extruded at 250 °C. The increasing extrusion temperature results in grain coarsening and strength reduction. When the extrusion temperatures are 110 °C and 170 °C, the average grain size reaches submicron level of 0.65 μm and 0.89μm, respectively. Because the higher extrusion temperature makes the dynamically recrystallized grains rotate in a favorable direction, the basal texture enhances with the rise of extrusion temperature. The ...
Source: Journal of Alloys and Compounds - Category: Chemistry Source Type: research
More News: Chemistry | Magnesium