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자료유형
학술저널
저자정보
A. Montajabnia (Islamic Azad University) B. Pourbahari (University of Tehran) M. Emamy (University of Tehran)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.5
발행연도
2018.1
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1,099 - 1,111 (13page)

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The microstructures and tensile properties of Mg–x wt%Al–y wt%Sb alloys have been studied where x/y ratio was 1 andSb(Al) contents were 5, 10, 15 and 20 wt%, respectively. The results indicated that by increasing Sb(Al) content, not onlythe crystals of primary Mg 3 Sb 2 alter from small fl ake-like particles to polygonal or needle-like morphology, but also theeutectic structure changes from semi-continuous network in Mg–5Al–5Sb to continuous network in Mg–20Sb–20Al alloy. The results obtained from thermal analysis revealed different peaks related to the formation of Mg 3 Sb 2 as primary phase andeutectic structure containing Mg 17 Al 12 + Al 3 Mg 2 intermetallic phases. Further results also revealed that Sb(Al) additionschange the solidification performance of the material by depressing the Mg 3 Sb 2 nucleation temperature, reducing solidifi -cation range and widening eutectic area. Tensile testing results showed that with the increase in Sb (Al) content, ultimatetensile strength (UTS) and elongation values of the alloys are decreased in as-cast condition. But, signifi cant improvement inthe UTS and elongation values of the extruded specimens was attributed to the severe fragmentation of intermetallic phasesand well distributed fi ne particles in the matrix which provided proper obstacles for dislocation motion. It was interesting tonote that the fracture behavior of intermetallic particles was found to be different, while Mg 3 Sb 2 was ductile, intermetalliccompounds in eutectic regions were brittle.

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