Kumamoto University

Nissan Motor Company Limited

Kobe Steel, Ltd.

Other

Chiba University

Kuroki Kogyosho Co., Ltd

Kumamoto Technology and Industry Foundation

Kuroki Kogosyo Co., Ltd.

Mitsubishi Heavy Industries Limited

Kabushiki Kaisha Kobe Seiko Sho

National University Corporation Kumamoto University

Kawamura, Yoshihito

Yoshihito Kawamura

Hiroshi Sakurai

Takayuki Takahashi

Hiroki Mori

Michiaki Yamasaki

Hironori Kuroki

Yoshio Okada

Koji Itakura

Mamoru Nakata

Yuuichi Yamada

Yuji Yanagida

Jonghyun Kim

Takahiro Mibe

Naohisa Sawai

Masafumi Miyajima

Takaomi Itoi

Mitsuji Hirohashi

Masafumi Noda

M c/o Graduate School Kumamoto Univ Yamasaki

Michiaki c/o Graduate School Yamasaki

Minami Sasaki

To provide a magnesium alloy having high incombustibility, high strength and high ductility together. A magnesium alloy including Ca in an amount of 'a' atomic %, Al in an amount of 'b' atomic % and a residue of Mg, including (Mg, Al)Ca in an amount of 'c' volume %, wherein &#x201c;a&#x201d;, &#x201c;b&#x201d; and &#x201c;c&#x201d; satisfy the following equations (1) to (4), and having the (Mg, Al)Ca dispersed therein.3&#x2264;&#x2264;7&#x2003;&#x2003;(1)4.5&#x2264;&#x2264;12&#x2003;&#x2003;(2)1.2&#x2264;&#x2264;3.0&#x2003;&#x2003;(3)10&#x2264;&#x2264;35&#x2003;&#x2003;(4)

Magnesium alloy and production method of the same

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 &#x3b1;Mg phases having thickness in the observed section of 0.5 &#x3bc;m or less are laminated in a layered manner with the sheet-shape long period stacking order phase.

Magnesium alloy sheet material

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&#x2264;a&#x3c;5.0 (2) 0.5&#x3c;b&#x3c;5.0 (3) &#x2154;a&#x2212;&#x215a;&#x2264;b.

High strength and high toughness magnesium alloy and method of producing the same

A magnesium alloy having high strength and high ductility and in which at least one of corrosion resistance and flame resistance is enhanced, or a method of manufacturing the same. The magnesium alloy contains an atomic % of Ca and b atomic % of Al, totally contains k atomic % of at least one element selected from a group consisting of Mn, Zr, Ag, Y and Nd, has a composition in which a remaining part is formed of Mg and contains c volume % of (Mg, Al)Ca, a, b, c and k satisfying formulae (1) to (4) and (21) below. The (Mg, Al)Ca is dispersed and the at least one element is an element that enhances at least one of corrosion resistance and flame resistance: (1) 3&#x2264;a&#x2264;7, (2) 4.5&#x2264;b&#x2264;12, (3) 1.2&#x2264;b/a&#x2264;3.0, (4) 10&#x2264;c&#x2264;35, (21) 0&#x3c;k&#x2264;0.3.

Magnesium alloy and method of manufacturing same

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&#x2014;Zn&#x2014;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&#x2014;Zn&#x2014;RE alloy has a lamellar phase formed from a long period stacking ordered structure and &#x3b1;-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 &#x3b1;-Mg having a mean particle diameter of 2 &#x3bc;m or less is formed in the divided portion.

Magnesium alloy material and production process thereof

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, heating and melting the metal glass to form a molten layer, and joining the metal glass and the crystalline metal. 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 0.2 seconds or more. The metal glass and the crystalline metal are formed with a material that satisfies a temperature range of a temperature of the metal glass at which a spread factor of the crystalline metal that has not been melted and the molten metal glass is 25% or more and a melting point of the crystalline metal to be 100 K or more.

Method of welding method, welding method and welded joint body

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 () and a crystalline metal () are butted against each other to define a groove space (Y) over a groove formed on the side of the crystalline metal (). Then, electron beam welding is performed in a position shifted from the butt interface toward the metallic glass () to form a melt zone () which has a composition for forming an amorphous metallic glass, and comprises a top fused sub-region () and a lower fused sub-region (), wherein the top fused sub-region has a relatively wide area including the groove space (Y) defined adjacent to an upper end of the butt interface and on the side of the crystalline metal, and the lower fused sub-region extends from the top fused sub-region to reach bottom surfaces of the metallic glass and the crystalline metal, while being narrowingly tapered in a downward direction.

Method of welding metallic glass with crystalline metal by high-energy beam

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&#x2014;Zn&#x2014;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=&#x3b2;-phase, &#x3b2;'-phase, and &#x3b2;1-phase).

Magnesium alloy material and method for manufacturing same

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&#x2266;&#x2266;10&#x2003;&#x2003;(1)0.2&#x2266;&#x2266;10&#x2003;&#x2003;(2)2/3&#x2212;2/3&#x2003;&#x2003;(3)

High-strength and high-toughness magnesium alloy and method for manufacturing same

Growing community of inventors

Kumamoto, Japan

Yoshihito Kawamura