Effects of friction stir processing and minor Sc addition on the microstructure, mechanical properties, and damping capacity of 7055 Al alloy

Journal Article · Mon Jan 15 00:00:00 EST 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2017.11.030· OSTI ID:22804857

Chen, Y. ^[1]; Zhang, B. ^[2]; Zhou, W. B.; Jiang, H. J.; Huang, H. F.; Wei, L. L. ^[1]

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1. Key Laboratory of New Processing Technology for Nonferrous Metal & Materials, Ministry of Education, Guilin University of Technology, Guilin 541004 (China)
2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004 (China)

Highlights: • Good mechanical and damping properties were obtained in the 7055 after FSP and Sc addition. • The strengthening and damping mechanisms of FSP 7055(-Sc) were analyzed. • FSP and Sc addition were found to be strategy of preparing 7xxx alloys with well damping and mechanical properties. - Abstract: This study investigated the effects of friction stir processing (FSP) and addition of 0.25% (mass ratio) Sc on the microstructure, mechanical properties, and damping capacity of AA 7055 alloy. Microstructure analyses revealed that a low tool rotation rate of 300 rpm effectively inhibited the grain coarsening in the recrystallization of the alloy during FSP. Sc addition prevented the coarsening of grains and precipitated η phase and the annihilation of dislocations in the FSP AA 7055 alloy. After being subjected to FSP at 300 rpm, the AA 7055 alloy containing Sc exhibited good mechanical and damping properties, which were mainly attributed to the fine recrystallized grain structure, fine precipitated η phase, and large number of nano-sized Al{sub 3}(Sc, Zr) particles located at the grain boundaries and dislocations. This work provides an effective strategy for preparing commercial Al alloys with excellent damping capacity and mechanical properties.

• OSTI ID: 22804857
• Journal Information: Materials Characterization, Vol. 135; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ALUMINIUM ALLOYS
ANNIHILATION
DISLOCATIONS
MICROSTRUCTURE
NANOSTRUCTURES
PRECIPITATION
RECRYSTALLIZATION
SCANDIUM ADDITIONS