The Effect of Temperature on the Microstructure and Mechanical Properties of Magnesium AZ31C Alloy in Tubular Channel Angular Pressing (TCAP)

چکیده مقاله

The current research studies the effect of temperature on the microstructure and mechanical properties of magnesium AZ31C alloy in tubular channel angular pressing. Pressing process was performed in two passes at temperatures of 200, 250 and 300 °C, then processed tubes were exposed to tensile and Vickers microhardness test and Metallography. Results obtained by this research study showed that the highest increase in ultimate strength and yield after one pass at temperature of 200 °C is equal to 287.5 and 252.5 MPa, respectively indicating that the strength of processed tubes increases by reducing temperature. The most percent reduction in elongation was obtained after one pass at 250 °C to value of 1.03 %. Results of temperature effect do not show a stable trend in elongation percentage. The processed tubes hardness increases by reducing temperature, in a way that the highest hardness value of processed tubes to 77 Hv was obtained after second pass at 200 °C. Results of the effect of temperature on microstructure show that the grain size has become smaller with decreasing temperature in one-pass and two-pass tubes. Also microstructural investigation shows notably decrease in the grain size to around 520 nm from the primary value of ~1.2 µm at 250°C. 

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