Effect of Ti Addition on the Microstructure and Mechanical Properties of Cast AZ91 Magnesium Alloy

Abstract:

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Ti addition to AZ91 alloy has been investigated with conventional casting. The microstructure and mechanical property were examined. The results show that addition of Ti with an amount of 0.1~0.5%wt resulted in a refinement of the as-cast microstructure. The morphology of β phase is changed from coarse, uneven, semi-continuous skeletal network to small, uniform, short rod-like or granular. When the content of Ti is 0.4wt%, the tensile strength and elongation go up to maximum value of 197 MPa and 6.9% respectively. Small addition of 0.2%wt Ti to AZ91 alloy predominantly forms TiAl3 phase, lying in β-phases at the grain boundaries. The mechanism of mechanical properties improvement caused by Ti addition is discussed.

Info:

Periodical:

Advanced Materials Research (Volumes 189-193)

Edited by:

Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang

Pages:

3819-3823

DOI:

10.4028/www.scientific.net/AMR.189-193.3819

Citation:

X. L. Ai et al., "Effect of Ti Addition on the Microstructure and Mechanical Properties of Cast AZ91 Magnesium Alloy", Advanced Materials Research, Vols. 189-193, pp. 3819-3823, 2011

Online since:

February 2011

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Price:

$35.00

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