Manufacturing Science and Technology(CEASE PUBLICATION) Vol. 3(4), pp. 124 - 127
DOI: 10.13189/mst.2015.030408
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Hardness Inhomogeneity and Microstructure Stability in Aluminum-copper Alloys Processed by Equal Channel Angular Pressing

Mahmoud S Soliman ^*, Ehab A El-Danaf , Mohammad J Al-Suwinea
Department of Mechanical Engineering, King Saud University, Saudi Arabia

ABSTRACT

Three alloys; Al- 2Cu, Al- 2Cu- 0.5Ag and Al-2Cu- 0.5Mg (composition in wt.%) were casted from high purity metals into rods of 14 mm diameter and 80 mm long, using chill casting. Samples of 11 mm diameter and 70 mm long were machined, solution treated and overaged at 350℃ and then subjected to equal channel angular pressing (ECAP) processing, for one pass and two passes (route A) at room temperature. The microhardness of ECAP processed specimens was measured along a diametral direction from the top to bottom surface at room temperature (RT). The results indicate homogeneous deformation with hardness values fluctuating around mean value with standard error of ± 5 HV. The thermal stability and recovery process of ECAP processed samples, were investigated by isochronal aging in the temperature range of 200-375℃ for half an hour. Hardness values were compared and showed gradual decrease with increasing aging temperature for one-pass ECAP processed samples. For two-pass processed samples hardness tends to increase, after initial decrease, with increasing annealing temperature above 300℃. Mechanical testing showed high increase in tensile properties with number of passes as compared to overaged samples. Two-pass samples exhibited high tensile strength, high strain hardening and high ductility.

KEYWORDS
Aluminum Alloys, ECAP, Hardness, Mechanical Properties

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Mahmoud S Soliman , Ehab A El-Danaf , Mohammad J Al-Suwinea , "Hardness Inhomogeneity and Microstructure Stability in Aluminum-copper Alloys Processed by Equal Channel Angular Pressing," Manufacturing Science and Technology(CEASE PUBLICATION), Vol. 3, No. 4, pp. 124 - 127, 2015. DOI: 10.13189/mst.2015.030408.

(b). APA Format:
Mahmoud S Soliman , Ehab A El-Danaf , Mohammad J Al-Suwinea (2015). Hardness Inhomogeneity and Microstructure Stability in Aluminum-copper Alloys Processed by Equal Channel Angular Pressing. Manufacturing Science and Technology(CEASE PUBLICATION), 3(4), 124 - 127. DOI: 10.13189/mst.2015.030408.