National Institute for Materials Science

Yoshiaki Osawa

Hidetoshi Somekawa

Toshiji Mukai

Alok Singh

Adding multiple solute elements could create fracture origin through formation of intermetallic compound due to bonding of added elements. While maintaining microstructure for activating non-basal dislocation movement, additive elements not to create fracture origin, but to promote grain boundary sliding are preferably found from among inexpensive and versatile elements. Provided is Mg-based wrought alloy material including two or more among group consisting of Mn, Zr, Bi, and Sn; and Mg and unavoidable constituents, having excellent room-temperature ductility and characterized by having finer crystal grain size in Mg parent phase during room-temperature deformation and in that mean grain size in matrix thereof is 20 &#x3bc;m or smaller; rate of (&#x3c3;&#x2212;&#x3c3;)/&#x3c3;(maximum load stress (&#x3c3;), breaking stress (&#x3c3;)) in stress-strain curve obtained by tension-compression test of the wrought material is 0.2 or higher; and resistance against breakage shows 200 kJ or higher.

Magnesium-based wrought alloy material and manufacturing method therefor

Provided is Mg-based alloy wrought material having improved ductility, formality, and resistance against fracture. Intermetallic compounds may be formed by mutual bonding of added elements to be a fracture origin. While maintaining microstructure for activating non-basal dislocation movement of Mg-based alloy wrought material, added elements to create no fracture origin, but to promote grain boundary sliding were found from among inexpensive and versatile elements. Provided is Mg-based alloy wrought material including at least one element from Zr, Bi, and Sn and at least one element from Al, Zn, Ca, Li, Y, and Gd wherein remainder comprises Mg and unavoidable impurities; an average grain size in a parent phase is 20 &#x3bc;m or smaller; a value of (&#x3c3;&#x2212;&#x3c3;)/&#x3c3;(maximum load stress (&#x3c3;), breaking stress (&#x3c3;)) in a stress-strain curve obtained by tension-compression tests of the wrought material is 0.2 or higher; and resistance against breakage shows 100 kJ or higher.

Magnesium-based alloy wrought product and method for producing same

The quasicrystal phase and/or quasicrystal-like phase particles, which is composed of the Mg&#x2014;Zn&#x2014;Al, are dispersed into Mg-base alloy material for strain working. The microstructure in this material does not include the dendrite structure, and the size of the magnesium matrix is 40 &#x3bc;m or less than 40 &#x3bc;m. The present invention shows that the quasicrystal phase and/or quasicrystal-like phase is able to form by addition of the Zn and Al elements except for the use of rare earth elements. In addition, the excellent trade-off-balancing between strength and ductility and reduction of the yield anisotropy, which are the serious issues for the wrought processed magnesium alloys, is able to obtain by the microstructure controls before the strain working process.

Mg-base alloy

Provided is a Mg alloy, in which precipitated particles are dispersed and which has enhanced tensile strength regardless of the size of the magnesium matrix grains therein.

Mg alloy

An Mg-base alloy shows that an Mg-base alloy, which is added Zn and Al to magnesium, has a composition represented by (100-a-b) wt % Mg-a wt % Al-b wt % Zn, and satisfying 0.5&#x2266;b/a. The alloy can reduce yield anisotropy, which is a serious problem for the wrought magnesium alloy, while maintaining a high strength property. The alloy is produced by additive elements, such as Zn and Al, which are easily obtained in place of rare earth elements.

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Ibaraki, Japan

Yoshiaki Osawa