Abstract: An copper alloy material having a structure in which fine particles with a mean particle size of 50 nm or less have precipitated in a structure composed of fibrous crystal grains with a minor axis length of 10 &mgr;m or less which are composed of subgrains with a mean grain size of 3 &mgr;m or less is obtained by extruding an alloy material represented by a general formula Cubal.Xa (wherein X is at least one element selected from the group consisting of Cr, Zr, Fe, P, and Ag; a is 1.5% by weight or less, and the balance is Cu comprising unavoidable impurities) at an extrusion ratio of 4 or higher and at a temperature of 300 to 600° C. The copper alloy material is preferably heat treated at a temperature of 350 to 700° C before and after the extrusion.

Abstract: A method of manufacturing a press-formed product having a base portion and a projecting portion which is integral with the base portion and projects in a direction different from the base portion, wherein a first forming part for forming the base portion and a second forming part which is integral with the first forming part and projects in a direction different from the first forming part are provided in a divided forming mold, and the first forming part communicates with an accommodating hole having an alloy material input port which is smaller in area than the first forming part, the method comprising the steps of moving a material placed in the accommodating hole, in the state of plastic flow by means of pressure means, and moving the material in the state of plastic flow while sequentially changing the direction of movement of the material, from the accommodating hole to the first forming part and then from the first forming part to the second forming part, thereby press-feeding and forming the alloy mat

Abstract: The present invention provides high strength magnesium-based alloys which are composed a fine crystalline structure, the alloys having a composition represented by the general formula (I) Mg.sub.a X.sub.b ; (II) Mg.sub.a X.sub.c M.sub.d, (III) Mg.sub.a X.sub.c Ln.sub.e ; or (IV) Mg.sub.a X.sub.c M.sub.d Ln.sub.e (wherein X is one or more elements selected from the group consisting of Cu, Ni, Sn and Zn; M is one or more elements selected from the group consisting of Al, Si and Ca; Ln is one or more elements selected from the group consisting of Y, La, Ce, Nd and Sm or a misch metal of rare earth elements; and a, b, c, d and e are atomic percentages falling within the following ranges: 40.ltoreq.a.ltoreq.95, 5.ltoreq.b.ltoreq.60, 1.ltoreq.c.ltoreq.35, 1 .ltoreq.d.ltoreq.25 and 3.ltoreq.e.ltoreq.25). Since the magnesium-based alloys have a superior combination of properties of high hardness, high strength and good processability, they are very useful in various industrial applications.