Nissan Motor Company Limited

Kobe Steel, Ltd.

Nippon Light Metal Company, Ltd.

Kumamoto University

Kabushiki Kaisha Kobe Seiko Sho

National University Corporation Kumamoto University

Koji Itakura

Yoshihito Kawamura

Michiaki Yamasaki

Yoshio Okada

Yusuke Nagaishi

Mamoru Nakata

Yuuichi Yamada

Shigeyuki Nakagawa

Toshiya Anami

Pizhi Zhao

Takeshi Handa

Tomoyuki Hirayama

Takahiro Mibe

Tsutomu Hattori

Satoru Suzuki

Haruyasu Katto

Hirokazu Miyagawa

Shigenori Yoshizawa

Akio Yoshizawa

An aluminum alloy sheet includes an aluminum alloy substrate having a composition containing, by mass percentage, 3.0 to 4.0% of magnesium, 0.2 to 0.4% of manganese, 0.1 to 0.5% of iron, not less than 0.03% but less than 0.10% of copper, and less than 0.20% of silicon, with the remainder being aluminum and unavoidable impurities. A peak concentration of a copper concentration distribution in a thickness direction in a region at a depth of 15 nm to 200 nm from the surface of the aluminum alloy substrate is equal to or more than 0.15%, and the aluminum alloy substrate has a recrystallized structure with an average grain size of 15 &#x3bc;m or less.

Aluminum alloy sheet and method for 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

There is provided an aluminum alloy casting consisting essentially of 7.0 to 11.5 mass % of Si, 0.9 to 4.0 mass % of Mg, 0.1 to 0.65 mass % of Fe, 0.1 to 0.8 mass % of Mn and the balance being Al and unavoidable impurities, or consisting essentially of 7.0 to 11.5 mass % of Si, 0.9 to 4.0 mass % of Mg, 0.1 to 0.65 mass % of Fe, 0.1 to 0.8 mass % of Mn, 0.3 to 1.0 mass % of Cu and the balance being Al and unavoidable impurities, and containing eutectic Si grains having an aspect ratio of 2.0 or smaller and an average grain size of 1.0 micrometer or smaller. There is also provided an automotive part formed with the aluminum alloy casting and a production method of the aluminum alloy casting.

Aluminum alloy casting and production method thereof

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

Growing community of inventors

Fujisawa, Japan

Koji Itakura