Journal
MATERIALS TRANSACTIONS
Volume 43, Issue 3, Pages 580-584Publisher
JAPAN INST METALS
DOI: 10.2320/matertrans.43.580
Keywords
magnesium base alloy; hexagonal phase; long periodic atomic configuration; rapid solidification; extruded bulk allols; high strength; good ductility
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A magnesium (Mg) solid solution with a novel long periodic hexagonal structure was formed for a Mg97Zn1Y2 (at%) alloy in a rod form prepared by extrusion of atomized powders at 573 K as well as in a melt-spun ribbon form. The novel structure of the rod alloy had an ABACAB-type six layered packing with lattice parameters of a = 0.322 nm and c = 3 x 0.521 nm, The Mg phase in the extruded rod alloy had fine grain sizes of 100 to 150 nm and included cubic Mg24Y5 particles with a size of about 10 nm at volume fractions below 10%. The density (p) was 1.84Mg/m(3). The tensile yield strength (sigma(y)) and elongation of the rod alloy were 6 10 MPa and 5%, respectively. and the specific strength defined by the ratio of sigma(y) to p was 330 MPa/(Mg/m(3)), being the highest among all metallic alloys, The sigma(y) is 2.7 to 8 times higher than those for conventional high-strength Mg-based alloys. The excellent mechanical properties are due to the combination of fine grain size. new long periodic hexagonal solid solution, homogeneous dispersion of fine Mg24Y5 particles inside the nano-grains and the absence of the second precipitates along the grain boundary. The new Mg-based alloy is promising for future uses in many fields.
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