lapovok-microstructureandmechanic-2017.pdf (2.78 MB)
Microstructure and mechanical properties of LPSO phase dominant Mg85.8Y7.1Zn7.1 and Mg85.8Y7.1Ni7.1 alloys
journal contribution
posted on 2017-04-01, 00:00 authored by S M Zhu, Rimma Lapovok, J F Nie, Y Estrin, S N MathaudhuMg 85.8 Y 7.1 Zn 7.1 (Mg 12 Y 1 Zn 1 ) and Mg 85.8 Y 7.1 Ni 7.1 (Mg 12 Y 1 Ni 1 ) alloys composed primarily of long-period stacking ordered (LPSO) phase were prepared by conventional casting and were further processed by hot extrusion or equal-channel angular pressing (ECAP) to investigate the effect of substitution of Zn with Ni on microstructure and mechanical properties. While a mixture of 18R and 14H structures of the LPSO phase was observed in the cast Mg 85.8 Y 7.1 Zn 7.1 alloy after homogenisation treatment, the LPSO phase in the Mg 85.8 Y 7.1 Ni 7.1 alloy was found to consist of 18R only. Beside the LPSO phase, both alloys contained small amounts of α-Mg and intermetallic phases, viz. MgZn 2 Y (W-phase) in the Mg 85.8 Y 7.1 Zn 7.1 alloy and MgNi 2 and MgNi 4 Y in the Mg 85.8 Y 7.1 Ni 7.1 alloy. Mechanical testing of the extruded or ECAP processed alloys showed that the substitution of Zn with Ni significantly improved the strength of the Mg 85.8 Y 7.1 Zn 7.1 alloy, but at the expense of ductility. The mechanical properties of the alloys are discussed in light of the microstructural observations.
History
Journal
Materials science and engineering aVolume
692Pagination
35 - 42Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0921-5093Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2017, ElsevierUsage metrics
Keywords
Magnesium alloysLong-Period Stacking Ordered (LPSO) phaseMechanical propertiesMg–Y–ZnMg–Y–NiScience & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringScience & Technology - Other TopicsMaterials ScienceMg-Y-ZnMg-Y-NiY-ZN ALLOYSSTACKING ORDERED PHASEMAGNESIUM ALLOYMG94Y4ZN2 ALLOYNISTRENGTHEQUILIBRIASYSTEMDEFORMATIONEXTRUSIONMechanical Engineering
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