Effect of Grain and Secondary Phase Morphologies in the Mechanical and Damping Behavior of Al7075 Alloys

被引:25
|
作者
Puga, H. [1 ,2 ]
Carneiro, V. H. [2 ]
Barbosa, J. [1 ,2 ]
Soares, D. [1 ,2 ]
机构
[1] Univ Minho, CMEMS, Campus Azurem, P-4800058 Guimaraes, Portugal
[2] Univ Minho, Dept Mech Engn, Campus Azurem, P-4800058 Guimaraes, Portugal
关键词
ultrasonic treatment; intermetallic phases; grain refinement; mechanical properties; damping; INTERNAL-FRICTION; MAGNESIUM ALLOYS; REFINEMENT; ALUMINUM; MICROSTRUCTURE; TEMPERATURE; MODULUS;
D O I
10.1007/s12540-016-6073-y
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The present study evaluates the role of the microstructure in the static and dynamic mechanical behavior of as-cast Al7075 alloy promoted by ultrasonic treatment (US) during solidification. The characterization of samples revealed that US treatment promoted grain and intermetallics refinement, changed the shape of the intermetallic phases (equilibrium phases of soluble M and/or T (Al, Cu, Mg, Zn) and their insoluble Al-Cu-Fe compounds) and lead to their uniform distribution along the grain boundaries. Consequently, the mechanical properties and damping capacity above critical strain values were enhanced by comparison with values obtained for castings produced without US vibration. This results suggest that the grain and secondary phases refinement by US can be a promising solution to process materials to obtain high damping and high strength characteristics.
引用
收藏
页码:863 / 871
页数:9
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