A thousandfold creep strengthening by Ca addition in die-cast AM50 magnesium alloy

The effect of calcium addition on the microstructure and creep strength of the die-cast AM50 magnesium alloy was investigated. The [alpha]-Mg grains with the diameter of 4.9 µm are surrounded by the eutectic phases for the AM50-1.72 mass pct Ca alloy, while the [beta](Mg^sub 17^Al^sub 12^) particles...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2004-09, Vol.35 (9), p.3029-3032
Main Authors: TERADA, Yoshihiro, SOTA, Rie, ISHIMATSU, Naoya, SATO, Tatsuo, OHORI, Koichi
Format: Article
Language:English
Subjects:
Alloys
Applied sciences
Calcium
Creep
Creep rupture strength
Exact sciences and technology
Impact analysis
Magnesium
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metallurgy
Metals. Metallurgy
Microstructure
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Summary:The effect of calcium addition on the microstructure and creep strength of the die-cast AM50 magnesium alloy was investigated. The [alpha]-Mg grains with the diameter of 4.9 µm are surrounded by the eutectic phases for the AM50-1.72 mass pct Ca alloy, while the [beta](Mg^sub 17^Al^sub 12^) particles are located mainly on the grain boundaries of the [alpha] grains for the AM50 alloy. The minimum creep rates of the AM50-1.72 mass pct Ca alloy are three orders of magnitude lower than those of the AM50 alloy at 423 K typically below 120 MPa. The thousandfold creep strengthening by the Ca addition is ascribed to the thermally stable eutectic phases appearing in the AM50-1.72 mass pct Ca alloy, which is expected to yield effective grain boundary strengthening or to resist the plastic flow of the [alpha]-Mg grains. [PUBLICATION ABSTRACT]
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-004-0046-3