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Effect of Manganese Addition on Strength and Fracture Toughness in Mg-6Al-1Zn Alloy

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Abstract:

The effect of manganese on strength and fracture toughness was investigated using five kinds of Mg-6Al-1Zn alloys. From the experimental results, the yield strength increased with increasing in manganese content until manganese content reached 0.14 wt. %. On the other hand, further increase in yield strength was not observed in case larger than 0.14 % of manganese was added. In addition, fracture toughness decreases with increasing manganese content. Fracture of magnesium alloy was ductile fracture by void coalescence. Adding excessive amount of manganese caused the increase in the presence of inclusions. This kind of particle easily became the nucleus of microvoid. As a conclusion, manganese should be added so that coarse manganese-bearing particle is not formed. Thus, 0.14 wt. % of manganese should be added to Mg-6Al-1Zn alloy in order to develop the alloy with well-balanced relationship between strength and fracture toughness.

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Periodical:

Key Engineering Materials (Volumes 306-308)

Pages:

857-862

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.306-308.857

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Online since:

March 2006

Authors:

Taisuke Sasaki, Tokuteru Uesugi, Yorinobu Takigawa, Kenji Higashi

Keywords:

Fractography, Fracture Toughness, Magnesium Alloy, Manganese Content, Strength

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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