Semisolid processing AZ91 magnesium alloy by electromagnetic stirring after near-liquidus isothermal heat treatment

AZ91 magnesium alloy was semisolid processed under experimental conditions designed to yield from 3 to 40% of the primary particles, and the semisolid slurry was produced by electromagnetic stirring after feedstock had been isothermally heat treated at near-liquidus temperature. The thixotropic micr...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2008-02, Vol.475 (1), p.194-201
Hauptverfasser: Zhang, Xiao-li, Li, Ting-ju, Teng, Hai-tao, Xie, Shui-sheng, Jin, Jun-ze
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Sprache:eng
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Zusammenfassung:AZ91 magnesium alloy was semisolid processed under experimental conditions designed to yield from 3 to 40% of the primary particles, and the semisolid slurry was produced by electromagnetic stirring after feedstock had been isothermally heat treated at near-liquidus temperature. The thixotropic microstructures obtained were characterized in detail and linked to the corresponding tensile properties. A unique microstructure was exhibited that the primary particles conglutinated together to form clusters due to sliding between solid particles and plastic deformation of solid particles during semisolid deformation [C.P. Chen, C.-Y.A. Tsao, Acta Mater. 45 (5) (1997) 1955–1968] which resulted from electromagnetic stirring. An increase of solid fraction exacerbated this agglomerating phenomenon accompanying an increment of β-Mg 17Al 12 content, and those finally resulted in a reduction in elongation. The fractographic analysis revealed that fracture mechanism and corresponding morphology of the rapture surface of tensile bars depend on the solid fraction of the primary particles.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2007.04.049