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Evolution of microstructures and phases of Al–Mg alloy under 4 GPa high pressure

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Abstract

Optical microscope (OM), energy dispersive X-ray (EDX) analysis, differential scanning calorimetry (DSC), X-ray diffraction (XRD) and transmission electron microscope (TEM) were applied to investigate the solidification microstructures and phases of Al–9.6 wt.% Mg alloy which solidified under 4 GPa high pressure with the melting temperature 1,153 K. Fine dendritic microstructures were obtained, and the second dendritic arm spacing reduced. Area fraction of the primary α-Al phase increased and that of the second phase decreased. In addition, the solid solubility of Mg in α-Al phase increased. The lattice constant of α-Al phase increased. Specially, the new double phase regions (α-Al′ + Al x Mg y ) formed besides a small amount of Al3Mg2 phases under high pressure. The Al x Mg y phase presented a mean size of about 20 nm, and had the hexagonal structure with the lattice constant of a = 0.288 nm, c = 0.8165 nm probably. Wherein the lattice constant of α-Al′ phase differed from that of α-Al phase greatly. Moreover, evolution mechanism of microstructures and phases under 4 GPa high pressure was discussed.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Z. J. Wei, Z. L. Wang, H. W. Wang & L. Cao

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  1. Z. J. Wei
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  2. Z. L. Wang
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  3. H. W. Wang
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  4. L. Cao
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Correspondence to Z. L. Wang.

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Wei, Z.J., Wang, Z.L., Wang, H.W. et al. Evolution of microstructures and phases of Al–Mg alloy under 4 GPa high pressure. J Mater Sci 42, 7123–7128 (2007). https://doi.org/10.1007/s10853-007-1531-z

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  • DOI: https://doi.org/10.1007/s10853-007-1531-z

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