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

Abstract:

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.

• Periodical: Advanced Materials Research (Volumes 189-193)
• Pages: 3819-3823
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.189-193.3819
• Online since: February 2011
• Authors: Xiu Lan Ai, Gao Feng Quan, Jun Yang, Zhao Ming Liu
• Keywords: AZ91 Magnesium Alloy, Mechanical Property, Microstructure, Ti Addition

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