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Mg-Al-Ca In-Situ Composites with a Refined Eutectic Structure and Their Compressive Properties

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Abstract

In a series of Mg x (Al2Ca)100−x (76 ≤ x ≤ 87) ternary alloys near the Mg-(Mg,Al)2Ca pseudo-binary eutectic point, different phases and morphologies based on ultrafine eutectic microstructure have been obtained by controlling the composition and changing the cooling rate via either induction melting or copper mold casting. For 81 ≤ x ≤ 87, the chill-cast alloys with ductile Mg dendrites embedded in an ultrafine [Mg + (Mg,Al)2Ca] eutectic matrix exhibit gradually increased fracture strength from 415 to 491 MPa with the decrease of Mg content. At x = 79, the Mg79Al14Ca7 alloy contains hard (Mg,Al)2Ca precipitates coexisting with ductile Mg dendrite, dispersed in the strong eutectic matrix. This alloy exhibits the highest compressive fracture strength (600 MPa), and the specific strength reaches 3.4 × 105 N·m·kg−1. The alloys all exhibit substantial plastic strain (5 to 6 pct). The attainment of such a combination of strength and plasticity is an interesting and useful step in improving the mechanical properties of lightweight Mg alloys.

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Acknowledgments

The authors gratefully acknowledge the assistance for the TEM sample preparation from Mrs. Feng-Lian Wang, Institute of Physics, Chinese Academy of Sciences, and the help with TEM observation from Mrs. Ming-Jie Zhang, Technical Support Division, SYNL. This work was supported by the National Basic Research Program of China (973 Program) under Contract No. 2007CB613906.

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Authors and Affiliations

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, P.R. China

    Ling-Ling Shi (Graduate Student) & Jian Xu (Professor)

  2. Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, MD, 21218, USA

    Evan Ma (Professor)

Authors
  1. Ling-Ling Shi
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  2. Jian Xu
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  3. Evan Ma
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Correspondence to Jian Xu.

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Manuscript submitted November 13, 2007.

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Shi, LL., Xu, J. & Ma, E. Mg-Al-Ca In-Situ Composites with a Refined Eutectic Structure and Their Compressive Properties. Metall Mater Trans A 39, 1225–1235 (2008). https://doi.org/10.1007/s11661-008-9488-3

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