Development of High Strength and High Toughness Aluminum Alloy and Application to Transportation Equipment
In order to develop a high strength aluminum alloy, ISMA developed an alloy composition and manufacturing process that increases the tensile strength of the existing material (A7150) by 25 % or more while maintaining the same ductility and toughness. A room temperature electrolytic refining process utilizing an ionic liquid was also developed as an alternative to the conventional Hall-Héroult process, which is an electric power-intensive technology. ISMA is also promoting development of high strength, high ductility automotive aluminum materials by using a multilayer structure, and is engaged in technology development of the basic manufacturing process, including the alloy composition, and study toward use in actual automotive members.
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Target for development of aluminum alloy
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Precision controlled rolling device
Research Achievements
Development of High Strength and High Toughness Aluminum Alloy
Research Achievements
A large increase in strength was achieved by improvement of the metal microstructure by adding torsional working to the conventional process. The final targets for alloy development (0.2 % proof stress > 700 MPa, elongation > 12 %, same toughness) were achieved in FY 2017.
Development of Process Technology for New Aluminum Material Production Process
Research Achievements
Aluminum in foil form was produced by using an independently-developed experimental drum-type continuous electrodeposition device, and a technology for recovery of the Al foil was established. The final targets are a production cost reduction of 25 % and impurity concentration of 10 ppm or less.
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Experimental drum-type continuous electrodeposition device and its mechanism
Development of Multilayer Aluminum Alloy
Research Achievements
Properties approaching the final targets (proof stress after heat treatment: 700 MPa or higher, elongation before forming: 20 % or more) were obtained by optimization of the alloy design, clad structure and heat treatment conditions.
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Goals and Level of Achievement of Multilayer Aluminum Alloy Development