Influence of ECAP as grain refinement technique on microstructure evolution, mechanical properties and corrosion behavior of pure aluminum

被引:55
作者
Abd El Aal, Mohamed Ibrahim [1 ]
Sadawy, M. M. [2 ]
机构
[1] Zagazig Univ, Mech Design & Prod Dept, Fac Engn, Zagazig 44519, Egypt
[2] Al Azhar Univ, Min & Petr Engn Dept, Cairo 11651, Egypt
关键词
equal channel angular pressing (ECAP); microstructure; mechanical properties; corrosion resistance; passive film; pitting; AL-CU ALLOYS; DEFORMATION-BEHAVIOR; CHANNEL; HOMOGENEITY; RESISTANCE; SIZE;
D O I
10.1016/S1003-6326(15)64034-1
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Pure aluminum samples were processed by equal channel angular pressing (ECAP) up to 10 passes at room temperature. The effects of the ECAP number of passes on the microstructure evolution, the mechanical properties, deformation homogeneity and corrosion behavior of the processed samples were fully investigated. The imposed strain resulted in an obvious reduction in the grain size from 390 mu m before ECAP down to 1.8, 0.4, and 0.3 mu m after ECAP up to 2, 4 and 10 passes, respectively. The microhardness, deformation homogeneity and tensile strength were increased while the elongation decreased with the increase of ECAP number of passes. Immersion tests, open circuit potential, Tafel polarization, cyclic polarization and potentiostatic measurements in 3.5% NaCl solution revealed an obvious improvement in the corrosion resistance of ECAP processed samples compared with the as-cast sample. The increase of the number of passes can be used successfully in producing ultra-fine grained (UFG) bulk pure aluminum sample with a high misorientation angle, reasonably high mechanical properties and corrosion resistance.
引用
收藏
页码:3865 / 3876
页数:12
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