Patents by Inventor Michiaki Yamasaki
Michiaki Yamasaki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230340653Abstract: The present disclosure intends to provide an aircraft member having both high strength and good ductility. Further, the present disclosure intends to provide an aircraft member satisfying required flame resistance. Further, the present disclosure intends to provide an aircraft member satisfying required corrosion resistance. In a method of manufacturing the aircraft member according to the present disclosure, a billet of an Mg—Al—Ca based alloy is extruded at an extrusion temperature that is higher than or equal to 350° C. and lower than or equal to 400° C. and at a ram rate that is higher than or equal to 1 mm/sec and lower than or equal to 3 mm/sec.Type: ApplicationFiled: October 8, 2020Publication date: October 26, 2023Inventors: Takayuki TAKAHASHI, Hiroki MORI, Yoshihito KAWAMURA, Michiaki YAMASAKI
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Patent number: 10358702Abstract: 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)2Ca in an amount of “c” volume %, wherein “a”, “b” and “c” satisfy the following equations (1) to (4), and having the (Mg, Al)2Ca dispersed therein. 3?a?7??(1) 4.5?b?12??(2) 1.2?b/a?3.Type: GrantFiled: April 16, 2013Date of Patent: July 23, 2019Assignee: NATIONAL UNIVERSITY CORPORATION KUMAMOTO UNIVERSITYInventors: Yoshihito Kawamura, Michiaki Yamasaki
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Patent number: 10184165Abstract: 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) ?a???b.Type: GrantFiled: August 1, 2014Date of Patent: January 22, 2019Inventors: Yoshihito Kawamura, Michiaki Yamasaki
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Patent number: 10138535Abstract: 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)2Ca, a, b, c and k satisfying formulae (1) to (4) and (21) below. The (Mg, Al)2Ca is dispersed and the at least one element is an element that enhances at least one of corrosion resistance and flame resistance: (1) 3?a?7, (2) 4.5?b?12, (3) 1.2?b/a?3.0, (4) 10?c?35, (21) 0<k?0.3.Type: GrantFiled: October 22, 2014Date of Patent: November 27, 2018Assignee: NATIONAL UNIVERSITY CORPORATION KUMAMOTO UNIVERSITYInventors: Yoshihito Kawamura, Michiaki Yamasaki
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Patent number: 9562277Abstract: 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.Type: GrantFiled: November 20, 2007Date of Patent: February 7, 2017Assignees: Kobe Steel, Ltd., NISSAN MOTOR CO., LTD., NATIONAL UNIVERSITY CORPORATION KUMAMOTO UNIVERSITYInventors: Mamoru Nakata, Yuuichi Yamada, Koji Itakura, Yoshio Okada, Yoshihito Kawamura, Michiaki Yamasaki
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Publication number: 20160369378Abstract: 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)2Ca, a, b, c and k satisfying formulae (1) to (4) and (21) below. The (Mg, Al)2Ca is dispersed and the at least one element is an element that enhances at least one of corrosion resistance and flame resistance: (1) 3?a?7, (2) 4.5?b?12, (3) 1.2?b/a?3.0, (4) 10?c?35, (21) 0<k?0.3.Type: ApplicationFiled: October 22, 2014Publication date: December 22, 2016Applicant: National University Corporation Kumamoto UniversityInventors: Yoshihito KAWAMURA, Michiaki YAMASAKI
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Publication number: 20160355917Abstract: 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.Type: ApplicationFiled: June 15, 2016Publication date: December 8, 2016Inventors: Yoshihito KAWAMURA, Michiaki YAMASAKI
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Publication number: 20150090374Abstract: 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)2Ca in an amount of “c” volume %, wherein “a”, “b” and “c” satisfy the following equations (1) to (4), and having the (Mg, Al)2Ca dispersed therein. 3?a?7??(1) 4.5?b?12??(2) 1.2?b/a?3.Type: ApplicationFiled: April 16, 2013Publication date: April 2, 2015Inventors: Yoshihito Kawamura, Michiaki Yamasaki
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Publication number: 20150023836Abstract: 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.Type: ApplicationFiled: July 28, 2014Publication date: January 22, 2015Inventors: Yoshihito KAWAMURA, Michiaki YAMASAKI
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Publication number: 20150020931Abstract: 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) ?a???b.Type: ApplicationFiled: August 1, 2014Publication date: January 22, 2015Inventors: Yoshihito KAWAMURA, Michiaki YAMASAKI
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Publication number: 20150013854Abstract: 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; 0.2?a?5.0??(1) 0.2?b?5.0??(2) 0.5a?0.Type: ApplicationFiled: September 18, 2014Publication date: January 15, 2015Inventors: Yoshihito KAWAMURA, Michiaki YAMASAKI
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Patent number: 8394211Abstract: 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).Type: GrantFiled: March 20, 2007Date of Patent: March 12, 2013Assignees: Kobe Steel, Ltd., Nissan Motor Co., Ltd., National University Corporation Kumamoto UniversityInventors: Mamoru Nakata, Yuuichi Yamada, Koji Itakura, Takahiro Mibe, Yoshio Okada, Yoshihito Kawamura, Michiaki Yamasaki
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Patent number: 8333924Abstract: 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.Type: GrantFiled: March 20, 2007Date of Patent: December 18, 2012Assignees: National University Corporation Kumamoto University, Chiba UniversityInventors: Yoshihito Kawamura, Michiaki Yamasaki, Takaomi Itoi, Mitsuji Hirohashi
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Publication number: 20100206438Abstract: 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).Type: ApplicationFiled: September 18, 2008Publication date: August 19, 2010Applicants: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), Nissan Motor Co., Ltd., NAT. UNIV. CORP. KUMAMOTO UNIVInventors: Mamoru Nakata, Yuuichi Yamada, Koji Itakura, Yoshihito Kawamura, Michiaki Yamasaki
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Publication number: 20100061882Abstract: 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.Type: ApplicationFiled: November 27, 2007Publication date: March 11, 2010Applicants: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd.), NAT. UNIV. CORP. KUMAMOTO UNIVInventors: Mamoru Nakata, Yuuichi Yamada, Koji Itakura, Yoshio Okada, Yoshihito Kawamura, Michiaki Yamasaki
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Publication number: 20090192595Abstract: 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.Type: ApplicationFiled: January 29, 2009Publication date: July 30, 2009Applicant: TERUMO KABUSHIKI KAISHAInventors: Hiroaki Nagura, Yoshihito Kawamura, Michiaki Yamasaki
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Publication number: 20090056837Abstract: 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).Type: ApplicationFiled: March 20, 2007Publication date: March 5, 2009Applicants: Nissan Motor Co., Ltd.,, National University Corp. Kumamoto UniversityInventors: Mamoru Nakata, Yuiichi Yamada, Koji Itakura, Takahiro Mibe, Yoshio Okada, Yoshihito Kawamura, Michiaki Yamasaki
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Publication number: 20090035171Abstract: 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.Type: ApplicationFiled: March 20, 2007Publication date: February 5, 2009Inventors: Yoshihito Kawamura, Michiaki Yamasaki, Takaomi Itoi, Mitsuji Hirohashi
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Publication number: 20080152532Abstract: 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.Type: ApplicationFiled: November 20, 2007Publication date: June 26, 2008Applicants: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), Nissan Motor Co., Ltd., National University Corp. Kumamoto UniversityInventors: Mamoru NAKATA, Yuuichi YAMADA, Koji ITAKURA, Yoshio OKADA, Yoshihito KAWAMURA, Michiaki YAMASAKI
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Publication number: 20070169859Abstract: 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.Type: ApplicationFiled: March 28, 2007Publication date: July 26, 2007Inventors: Yoshihito Kawamura, Michiaki Yamasaki