Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 524, Issue 1-2, Pages 119-128Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.06.013
Keywords
Friction stir processing; Bronze; Microstructure; Mechanical properties
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Funding
- National Outstanding Young Scientist Foundation [50525103]
- National Basic Research Program of China [2006CB605205]
- National High-tech Research Program [2006AA03Z111]
- Chinese Academy of Sciences
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As-cast Cu-9Al-4.5Ni-4Fe NiAl bronze (NAB) alloy was subjected to friction stir processing (FSP) in a wide range of tool rotation rates of 800-2000 rpm and traverse speeds of 50-200 mm/min. After FSP, the initial coarse microstructure of the as-cast NAB was transformed to fine structure, and the porosity defects were eliminated. However, the stir zones were characterized by inhomogeneous structure and could be divided into four regions: fine Widmanstatten primary alpha phase in the surface layer, banded primary alpha and beta' phases in the subsurface layer, equiaxed alpha and beta' phases in the center, and streamlike alpha and beta' phases at the bottom. The heterogeneous microstructure could be alleviated by adjusting the FSP parameters, but could not be completely eliminated under investigated FSP parameters. The FSP NAB exhibited significantly improved hardness, tensile strength, and ductility compared to the base metal. When the NAB was subjected to two pass FSP, its microstructure was further homogenized, resulting in apparently increased ductility with similar hardness and tensile strength. (C) 2009 Elsevier B.V. All rights reserved.
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