Journal
METALS AND MATERIALS INTERNATIONAL
Volume 10, Issue 6, Pages 605-608Publisher
KOREAN INST METALS MATERIALS
DOI: 10.1007/BF03027424
Keywords
magnesium alloys; casting; interface structure; microstructure; eutectic solidification
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The effects of Ni content on the microstructures of gravity cast Mg-Ni alloys were examined. Different shapes of primary solid particles and microstructures of the eutectic matrix were observed with varying Ni content. The eutectic matrix in the hypoeutectic alloy consisted of rod-like Mg2Ni phase with a small amount of alpha-Mg phase. The eutectic matrix in the near-eutectic and hypereutectic alloys consisted of eutectic cells oriented in different directions. A transition of lamellae to fiber occurred. The formation of cellular structure and transition of lamellae to fiber resulted from two-phase instability in the coupled region induced by constitutional undercooling,
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