Influence of Minor Additions of Be on the Eutectic Modification of an Al-33wt.%Cu Alloy Solidified under Transient Conditions

被引:4
|
作者
Rodrigues, Adilson Vitor [1 ,2 ]
Kakitani, Rafael [1 ]
Silva, Cassio [1 ]
Giovanetti, Leonardo [1 ]
Dias, Marcelino [3 ]
Henein, Hani [3 ]
Garcia, Amauri [1 ]
Cheung, Noe [1 ]
机构
[1] Univ Estadual Campinas, Fac Mech Engn, BR-13083860 Campinas, Brazil
[2] IFSP, Fed Inst Educ Sci & Technol Sao Paulo, BR-12903000 Braganca Paulista, Brazil
[3] Univ Alberta, Chem & Mat Engn Dept, Edmonton, AB T6G 2R3, Canada
基金
巴西圣保罗研究基金会;
关键词
Al-33Cu-Be alloys; directional solidification; microstructure; hardness; AL-CU; MECHANICAL-PROPERTIES; THERMAL PARAMETERS; MICROSTRUCTURE EVOLUTION; CORROSION BEHAVIOR; TENSILE PROPERTIES; SI; ALUMINUM; SN; BERYLLIUM;
D O I
10.3390/met13010094
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Al-based alloys are often selected for use in various engineering applications as well as in the aircraft and aerospace industry. The improvement of their performances under severe conditions have required the use of alloying elements. In the present work, Be is added to the eutectic Al-33 wt.%Cu alloy with a view to investigating the resulting effects on microstructural features and hardness. A directional solidification technique is used, yielding a wide range of solidification cooling rates. This permits microstructural features to be investigated with emphasis on the role of Be on the eutectic morphology. The directionally solidified microstructures are formed by eutectic colonies for the Al-33 wt.%Cu alloy, however, with additions of both 0.05 and 0.5 wt.% Be, the original cell-like morphology is transformed into a trefoil-like morphology. This together with the alpha-Al dendritic pattern characterize the microstructure of the Al-33Cu-Be alloys examined. Solidification growth laws are experimentally derived relating dendritic and eutectic colony spacings to solidification cooling rates and growth rates. The length scale of such spacings is shown not to affect the Vickers hardness of the Al-33Cu-Be alloys examined; however, the additions of Be are shown to improve the brittle behavior of the Al-33 wt.%Cu alloy.
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页数:18
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