Abstract
Effect of electromagnetic stirring on microstructure of AZ91-0.8%Ce magnesium alloy was investigated. The results show that electromagnetic stirring causes a change of morphology of α-Mg phase from coarse dendrites to fine rosette-like or spherical shape. Grain size is significantly refined within the range of input voltage 75–125 V, moreover, the optimum input voltage corresponded to the minimum value (64 μ m) of grain size is 125 V. Compared to the non-stirred condition, the amount of β-Mg17Al12 precipitate under the stirred condition obviously increases. The grain refinement of AZ91-0.8%Ce alloy is mainly attributed to multiplication of existing grains in the melt caused by forced fluid flow under electromagnetic stirring condition. Addition of 0.8% Ce results in the formation of ‘necking’ at secondary dendrite arm roots of α-Mg crystals, and consequently, it is helpful to increase the number of heterogeneous nucleation.
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References
Polmear I J. Magnesium alloys and applications[J]. Mater Sci Tech, 1994, 10(1): 1–16.
Mordike B L, Ebert T. Magnesium-properties-application-potential[J]. Mater Sci Eng, 2001, A302: 37–45.
Vinarcik E J. Light metal advances in the automotive industry[J]. Light Metal Age, 2001, 59(3/4): 74–77.
Mager S D M. A global review of magnesium parts in automobiles[J]. Light Metal Age, 1996, 54(9/10): 60–63.
Bamberger M. Structural refinement of cast magnesium alloys[J]. Mater Sci Tech, 2001, 17(1): 15–24.
Stjohn D H, Ma Q, Easton M A, et al. Grain refinement of magnesium alloys[J]. Metall Mater Trans, 2005, 36A(7): 1669–1678.
Tamura Y. Grain refining mechanism and casting structure of Mg-Zr alloy[J]. Japan Institute of Light Metals, 1998, 48(8): 185–189.
Tamura Y, Kono N, Motigi T, et al. Grain refinement of cast Mg-Al alloys[J]. Japan Institute of Light Metals, 1998, 48(4): 395–399.
Jung B I, Jung C H, Han T K, et al. Electromagnetic stirring and Sr modification in A356 alloy[J]. Journal of Materials Processing Technology, 2001, 111: 69–73.
ZHANG Shi-chang, WEI Bo-kang, CAI Qi-zhou, et al. Effect of mischmetal and yttrium on microstructures and mechanical properties of Mg-Al alloy[J]. Trans Nonferrous Met Soc China, 2003, 13(1): 83–87.
Wei L Y. The solidification behavior of Mg-Al-Rare earth alloys[J]. J Alloys and Compounds, 1996, 232(1/2): 264–268.
Wei L Y. Development of misconstrue in cast Mg-Al-rare earth alloys[J]. Mater Sci Tech, 1996, 12(9): 741–750.
Pettersen G. Microstructure of a pressure die cast magnesium-4% aluminium alloy modified with rare earth additions[J]. Mater Sci Eng, 1996, A207: 115–120.
Pettersen K, Lohne O, Ryum N. Dendritic solidification of magnesium alloy AZ91[J]. Metallurgical Trans, 1999, A21(1): 221–230.
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Foundation item: Project(2004ABA110) supported by the Natural Science Foundation of Hubei Province; project(471-38300843) supported by the Research Foundation for the Doctoral Program of Wuhan University of Technology
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Liu, Sf., Kang, Lg., Han, H. et al. Influence of electromagnetic stirring on microstructure of AZ91-0.8%Ce magnesium alloy. J Cent. South Univ. Technol. 13, 613–617 (2006). https://doi.org/10.1007/s11771-006-0002-z
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DOI: https://doi.org/10.1007/s11771-006-0002-z