Microstructure and tensile properties of a low-alloyed magnesium alloy: effect of extrusion temperature
Source abstract
Abstract
A low-alloyed Mg-1.2Zn-0.1Ca (wt%) alloy was extruded at different temperatures (150 °C, 200 °C, 250 °C, 300 °C), and the effect of extrusion temperature on the microstructure and tensile properties was investigated systematically. While the as-cast alloy presented many cracks on the surface when extruded at 150 °C, it demonstrated good extrudability at temperatures above 200 °C. With increasing extrusion temperature from 200 to 300 °C, the average dynamic recrystallization (DRX) grain size increased from ~ 2.6 to ~ 6.4 μm, and < 10–10 > texture gradually transformed to < 11–21 > rare-earth texture component. Solute segregation was observed along grain boundaries and dislocations. The sample extruded at 200 °C exhibited a superior combination of both strength and ductility, with a yield strength of 179 MPa, an ultimate tensile strength of 228 MPa and an elongation of 35%. The improved tensile properties were mainly attributed to the fine grain size together with a high density of dislocations. The basal slip Schmid factor increased with increasing extrusion temperature due to the attainment of full DRX microstructure and the presence of non-basal texture component, which resulted in a lower yield strength at higher extrusion temperatures. The findings pave the way for the development of low-cost and low-alloyed high-performance magnesium alloys via the strategy of tailoring extrusion temperatures.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnesium Alloys: Properties and Applications · Aluminum Alloys Composites Properties · Aluminum Alloy Microstructure Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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