Effect of Initial Microstructure under Different Solidification Conditions on Hot Working Behavior of AZ31 Alloy

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In order to investigate the effect of the as-cast microstructure on the hot working behavior of an AZ31 magnesium alloy, specimens were cast in copper moulds with and without water cooling. A series of compression tests were performed at a temperature of 350 °C, a strain rate of 0.01 s-1, and at strains up to 1.0. It was found that as-cast microstructure is very sensitive to the solidification conditions, which leads to a significant difference in flow behavior and dynamic recrystallization (DRX) characteristics. It appears that more uniform and refined as-cast grain size promotes dynamic recrystallization and reduces the flow stress. It is also possible that second phases (>1+m in size) contribute to DRX by acting as nuclei.

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Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

325-328

Citation:

L. Shang et al., "Effect of Initial Microstructure under Different Solidification Conditions on Hot Working Behavior of AZ31 Alloy", Materials Science Forum, Vols. 561-565, pp. 325-328, 2007

Online since:

October 2007

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$38.00

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