Development of Very High Strength and Ductile Dilute Magnesium Alloys by Dispersion of Quasicrystal Phase

作者：Singh Alok^*; Osawa Yoshiaki; Somekawa Hidetoshi; Mukai Toshiji; Parrish Catherine J; Shih Donald S

来源：Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 2014, 45A(8): 3232-3240.

DOI：10.1007/s11661-013-2056-5

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 A degrees C to 255 A degrees C), which produced an average grain size of about 1 mu m. Quasicrystalline i-phase particles were dispersed in the matrix with size ranging from 50 nm to 1 mu m. 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.

• 出版日期2014-7