Abstract: Disclosed is a magnesium alloy material having excellent tensile strength and favorable ductility. Therefore, the magnesium alloy sheet material formed by rolling a magnesium alloy having a long period stacking order phase crystallized at the time of casting includes in a case where a sheet-thickness traverse section of an alloy structure is observed at a substantially right angle to the longitudinal direction by a scanning electron microscope, a structure mainly composed of the long period stacking order phase, in which at least two or more ?Mg phases having thickness in the observed section of 0.5 ?m or less are laminated in a layered manner with the sheet-shape long period stacking order phase.

Abstract: To provide a method of welding a metallic glass and a crystalline metal by shifting a high-energy beam scan area from a butting face thereof to the metallic glass side, to fall within a composition range required for glass phase formation of a metallic glass base material in a simplified assured manner. In a welding method for weldingly joining a metallic glass and a crystalline metal together by scanning a high-energy beam in a position shifted from a butt interface between the metallic glass and the crystalline metal toward the metallic glass, it is intended to provide a technique for allowing a composition of a melt zone formed around a welding interface to fall within a composition range required for forming a glass phase in the metallic glass to be joined, in a simple and more reliable manner. A metallic glass (1) and a crystalline metal (2) are butted against each other to define a groove space (Y) over a groove formed on the side of the crystalline metal (2).

Abstract: The present invention provides a magnesium alloy material excellent in high mechanical characteristics without using special manufacturing facilities or processes and a method for manufacturing the magnesium alloy material. The magnesium alloy material is an Mg—Zn—RE alloy containing Zn as an essential component, at least one of Gd, Tb, and Tm as RE, and the rest including Mg and unavoidable impurities and contains a needle-like precipitate or a board-like precipitate (lengthy precipitate: X-phase=?-phase, ??-phase, and ?1-phase).

Abstract: Provided is a high-strength and high-toughness magnesium alloy which has practical level of both the strength and the toughness for expanded applications of the magnesium alloys, and is a method for manufacturing thereof. The high-strength and high-toughness magnesium alloy of the present invention contains: a atom % in total of at least one metal of Cu, Ni, and Co; and b atom % in total of at least one element selected from the group consisting of Y, Dy, Er, Ho, Gd, Tb, and Tm, while a and b satisfying the following formulae (1) to (3), 0.2?a?10??(1) 0.2?b?10??(2) 2/3a?2/3<b.

Abstract: A welding method is provided which makes it possible to obtain a joint body having a sufficient strength by selecting a metal glass and a crystalline metal having given conditions. According to the present invention, there is provided a welding method of applying energy to an interface where a metal glass and a crystalline metal make contact with each other or to the metal glass near the interface, of forming a molten layer by heating and melting the metal glass and of performing welding, in which the molten layer after the metal glass and the crystalline metal have been joined together has a glass formation ability, the metal glass has a glass formation ability in which a nose time of a TTT curve when a solid of the metal glass is reheated is 0.

Abstract: [Problems] To provide a method of welding a metallic glass and a crystalline metal by shifting a high-energy beam scan area from a butting face thereof to the metallic glass side, to fall within a composition range required for glass phase formation of a metallic glass base material in a simplified assured manner. [Means for Solving Problems] In a welding method for weldingly joining a metallic glass and a crystalline metal together by scanning a high-energy beam in a position shifted from a butt interface between the metallic glass and the crystalline metal toward the metallic glass, it is intended to provide a technique for allowing a composition of a melt zone formed around a welding interface to fall within a composition range required for forming a glass phase in the metallic glass to be joined, in a simple and more reliable manner. A metallic glass (1) and a crystalline metal (2) are butted against each other to define a groove space (Y) over a groove formed on the side of the crystalline metal (2).

Abstract: The present invention provides a magnesium alloy material excellent in mechanical properties without using specific manufacturing facilities and processes and a method of manufacturing the same. The magnesium alloy material is an Mg—Zn—RE alloy containing, as an essential component, Zn and at least one of Gd, Tb, and Tm as RE, and of the rest including Mg and unavoidable impurities, and has stacking faults of a thickened two-atomic layer of Zn and RE in the alloy structure of the Mg—Zn—RE alloy. A method of manufacturing a magnesium alloy material involves a casting step, a solution treatment step, and a heat treatment step and the heat treatment step is carried out in a condition satisfying ?14.58 [ln(x)]+532.32<y<?54.164 [ln(x)]+674.05 and 0<x?2, wherein y denotes the heat treatment temperature (K) and x denotes the heat treatment time (h).

Abstract: Disclosed is a magnesium alloy material which can be produced without the need of employing any specialized production facility or process and has excellent mechanical properties, particularly high elongation. Also disclosed is a process for producing the magnesium alloy material. The magnesium alloy material comprises a Mg—Gd—Zn alloy comprising 1 to 5 mass % of Zn and 5 to 15 mass % of Gd as essential ingredients, with the remainder being Mg and unavoidable impurities, wherein the Mg—Gd—Zn alloy has a long period stacking structure in its alloy structure and also has Mg3Gd and/or Mg3Zn3Gd2. The process for producing the magnesium alloy material comprises a melting/casting step and a forging processing step for subjecting the casted material to a hot forging processing at a predetermined processing rate.

Abstract: Disclosed herein is a medical implant including an implant body of which at least a part is comprised of a biodegradable metal, wherein the part comprised of the biodegradable metal has a crystal grain diameter of not more than 10 ?m.

Abstract: The present invention provides a magnesium alloy material excellent in high mechanical characteristics without using special manufacturing facilities or processes and a method for manufacturing the magnesium alloy material. The magnesium alloy material is an Mg—Zn—RE alloy containing Zn as an essential component, at least one of Gd, Tb, and Tm as RE, and the rest including Mg and unavoidable impurities and contains a needle-like precipitate or a board-like precipitate (lengthy precipitate: X-phase=?-phase, ??-phase, and ?1-phase).

Abstract: Provided is a high-strength and high-toughness magnesium alloy which has practical level of both the strength and the toughness for expanded applications of the magnesium alloys, and is a method for manufacturing thereof. The high-strength and high-toughness magnesium alloy of the present invention contains: a atom % in total of at least one metal of Cu, Ni, and Co; and b atom % in total of at least one element selected from the group consisting of Y, Dy, Er, Ho, Gd, Tb, and Tm, while a and b satisfying the following formulae (1) to (3), 0.2?a?10??(1) 0.2?b?10??(2) 2/3a?2/3<b.

Abstract: The present invention provides a magnesium alloy material, having superior mechanical properties without using special production equipment or processes, and a production process thereof. The magnesium alloy material of the present invention composed of an Mg—Zn-RE alloy comprises essential components in the form of 0.5 to 3 atomic percent of Zn and 1 to 5 atomic percent of RE, with the remainder comprising Mg and unavoidable impurities. The Mg—Zn-RE alloy has a lamellar phase formed from a long period stacking ordered structure and ?-Mg in the alloy structure thereof. The long period stacking ordered structure has at least one of a curved portion and a bent portion and has a divided portion in at least a portion thereof. Finely granulated ?-Mg having a mean particle diameter of 2 ?m or less is formed in the divided portion.

Abstract: This invention provides a high-strength and high-toughness metal which has strength and toughness each high enough to be put to practical use in expanded applications of magnesium alloys, and a process for producing the same. The high-strength and high-toughness metal is a magnesium alloy comprising a crystal structure containing an hcp-structure magnesium phase and a long-period layered structure phase. At least a part of the long-period layered structure phase is in a curved or flexed state. The magnesium alloy comprises a atomic % of Zn and b atomic % of Gd with the balance consisting of Mg.

Abstract: A high strength and high toughness magnesium alloy, characterized in that it is a plastically worked product produced by a method comprising preparing a magnesium alloy cast product containing a atomic % of Zn, b atomic % of Y, a and b satisfying the following formulae (1) to (3), and the balance amount of Mg, subjecting the magnesium alloy cast product to a plastic working to form a preliminary plastically worked product, and subjecting the preliminary plastically worked product to a heat treatment, and it has a hcp structure magnesium phase and a long period stacking structure phase at an ordinary temperature; (1) 0.5?a<5.0 (2) 0.5<b<5.0 (3) 2/3a?5/6?b.

Abstract: A high strength and high toughness magnesium alloy, characterized in that it is a plastically worked product produced by a method comprising preparing a magnesium cast product containing a atomic % of Zn, b atomic % in total of at least one element selected from the group consisting of Dy, Ho and Er, a and b satisfying the following formulae (1) to (3), and the balance amount of Mg, subjecting the magnesium alloy cast product to a plastic working to form a plastically worked product, and it has a hcp structure magnesium phase and a long period stacking structure phase at an ordinary temperature; (1) 0.2?a?5.0 (2) 0.2?b?5.0 (3) 0.5a?0.5?b.

Abstract: Provided are a magnesium alloy which is inexpensive, can be produced at a high yield, and has both high strength and high ductility; and a production process of the magnesium alloy. The magnesium alloy contains from 1 to 4 atomic % of Zn and from 1 to 4.5 atomic % of Y at a Zn/Y composition ratio ranging from 0.6 to 1.3, and contains both an intermetallic compound Mg3Y2Zn3, and Mg12YZn having a long period structure. It may contain from 2 to 3.5 atomic % of Zn and from 2 to 4.5 atomic % of Y at a Zn/Y composition ratio falling within a range of from 0.8 to 1.2. It may contain from 1 to 4 atomic % of Zn, from 1 to 4.5 atomic % of Y and from 0.1 to 0.5 atomic % of Zr and contains, as a remaining portion, Mg and inevitable impurities. An alloy structure having both an intermetallic compound Mg3Y2Zn3 and Mg12YZn having a long period structure is available by casting an Mg alloy containing from 1 to 4 atomic % of Zn and from 1 to 4.5 atomic % of Y at a Zn/Y composition ratio ranging from 0.6 to 1.

Abstract: A method of producing a compact of amorphous alloy, comprising the steps of, preparing a billet by filling a container made of a ductile metal with powder of the amorphous alloy, plastically working said billet at a temperature higher than plasticity transition temperature of the amorphous alloy but less than crystallization temperature of said alloy so that both a shear strain of not less than about 0.7 but less than 1.8 and a stress not less than about 90 Kgf/mm.sup.2 and less than 400 Kgf/mm.sup.2 are applied to the amorphous alloy powder filled in the container.

Abstract: A composite article comprising a metal and an amorphous metal bonded thereto by the explosion, being free from residual stress and compression stress in the amorphous metal portion, and having excellent magnetic properties inherent to the amorphous metal can be obtained by heating a composite article produced by bonding an amorphous metal to a metal through the explosion pressure to remove the residual stress caused in the amorphous metal during the explosion bonding, and then subjecting the heat treated composite article to a plastic working so as to give a tensile stress in the amorphous metal in an amount sufficient to offset the compression stress caused in the amorphous metal due to the heat treatment.

Abstract: An amorphous metal-metal composite article comprising a metal and an amorphous metal thin sheet firmly bonded thereto and having high durability and reliability can be obtained by a method, wherein the surface roughness of a metal to be bonded with an amorphous metal thin sheet is adjusted to a certain surface roughness and an explosion shock is applied to an assembly of the metal and the amorphous metal thin sheet superposed thereon, under a condition that the moving velocity of the collision point of the amorphous metal thin sheet to the metal is higher than the sound velocity in the amorphous metal.