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Development of Very High Strength and Ductile Dilute Magnesium Alloys by Dispersion of Quasicrystal Phase |
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| Authors: | Alok Singh Yoshiaki Osawa Hidetoshi Somekawa Toshiji Mukai Catherine J Parrish Donald S Shih |
| Affiliation: | 1. Microstructure Design Group, Structure Materials Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan 2. Structure Materials Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan 3. Toughness Design Group, Structure Materials Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan 4. Department of Mechanical Engineering, Kobe University, 1-1 Rokkadai, Kobe, Kobe 5. Materials and Processes, Boeing Research and Technology, The Boeing Company, Huntington Beach, CA, USA 6. Boeing Research and Technology, The Boeing Company, St. Louis, MO, USA |
| Abstract: | Very high strengths, with tensile yield strength from 377 to 405 MPa, combined with elongation to failure of over 12 pct, have been achieved in Mg-Zn-Y dilute alloys by direct extrusion. Alloys Mg-6xZn-xY, where x = 0.2, 0.35, and 0.5 (at. pct) were chill cast in a steel mold and direct extruded at a temperature in the range 508 K to 528 K (235 °C to 255 °C), which produced an average grain size of about 1 μm. Quasicrystalline i-phase particles were dispersed in the matrix with size ranging from 50 nm to 1 μm. In addition, high density of nano-precipitates of average size 15 nm was dispersed in matrix. Thus we have developed magnesium alloys of very high strength combined with ductility by a simple process using extrusion with very little addition of yttrium. |
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