Transition from Superplastic Behavior - Viscous Glide - Dislocation Climb - Power-Law Break down Regimes in Friction Stir Processed AA5083

Ehab El-Danaf; Mahmoud Soliman; Magdy M. El Rayes

doi:10.4028/www.scientific.net/MSF.863.23

Paper Titles

Wettability of TiAl Alloy on Calcia-Stabilized Zirconia
p.3

Effect of Hafnium on the Structural and Mechanical Properties of the Surface Layers on the Basis of TiNi
p.8

Microstructures and Mechanical Properties of Ti-Nb Alloy at Different Composition of Nb Produced via Powder Metallurgy Route
p.14

On the Bead Geometry of Dissimilar Joints between SA516Gr65 and 304L Produced by TIG and A-TIG Welding
p.19

Transition from Superplastic Behavior - Viscous Glide - Dislocation Climb - Power-Law Break down Regimes in Friction Stir Processed AA5083
p.23

Microstructural and Mechanical Characterization of Artificially-Aged Power Plant Steel
p.31

Effect of Composition on Tensile and Impact Properties of Tungsten-Based Heavy Alloy
p.40

Failure Analysis of an Additive Manufactured Porous Titanium Structure for Orthopedic Implant Applications
p.45

Friction and Wear of Commercially Pure Titanium with Different Microstructure from the View Point of Thermodynamic Analysis
p.50

HomeMaterials Science ForumMaterials Science Forum Vol. 863Transition from Superplastic Behavior - Viscous...

Transition from Superplastic Behavior - Viscous Glide - Dislocation Climb - Power-Law Break down Regimes in Friction Stir Processed AA5083

Abstract:

5083 Al alloy was friction stir processed (FSP) at room temperature under various experimental conditions. Two rotational speeds of 430 and 850 rpm with a single traverse feed of 90 mm/min (430-90, 850-90) were used, to investigate the effect of rotation speed. Also, another feed rate of 140 mm/min was used with a rotational speed of 430 rpm (430-140), to investigate the effect of feed rate. The processing conditions resulted in three different grain sizes of 0.95, 1.6 and 2.6 μm depending on the FSP parameters. The deformation behavior of the FSP samples was investigated at 250 C at three strain rates of 10^-4, 10^-3 and 10^-2 s^-1. The values of strain rate sensitivity, m was determined, as a function of grain size, and it decreased from 0.45 to 0.33 to 0.18 with increasing the grain size. True activation energy was calculated as 63, 95, 157 kJ/mole for the grain sizes of 0.95, 1.6 and 2.6 μm, respectively. These calculated values are comparable to grain boundary sliding of magnesium in aluminum (69 – 78 kJ mol^-1), magnesium in aluminum (~115 kJ mole^-1) and aluminum lattice diffusion (~143 kJ mol^-1 ). The change in the deformation mechanism with grain size was discussed in some details.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Materials Science Forum (Volume 863)

Pages:

23-30

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.863.23

Citation:

Cite this paper

Online since:

August 2016

Authors:

Ehab El-Danaf*, Mahmoud Soliman, Magdy M. El Rayes

Keywords:

Cavitation, Flow Mechanisms, Grain Boundary Sliding, Severe Plastic Deformation, Superplasticity

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

* - Corresponding Author

References

[1] R.S. Mishra, M.W. Mahoney Metalsuperplasticity enhancement and forming process, US Patent 6, 712, 916 (2004).

Google Scholar

[2] Z.Y. Ma, R.S. Mishra, M.W. Mahoney, Superplastic deformation behavior of friction stir processed 7075 Al alloy, Acta Mater. 50 (2002)4419– 4430.

DOI: 10.1016/s1359-6454(02)00278-1

Google Scholar

[3] P. Cavalierea, A. Squillace, High temperature deformation of friction stir processed 7075 aluminum alloy, Mater. Charact. 55(2005)136-142.

DOI: 10.1016/j.matchar.2005.04.007

Google Scholar

[4] L.B. Johannes, I. Charit, R.S. Mishra, R. Verma, Enhanced superplasticity through friction stir processing in continuous cast AA5083 aluminum, Mater. Sci. Eng. A. 464(1997)351-357.

DOI: 10.1016/j.msea.2007.02.012

Google Scholar

[5] M.S. Soliman, Scr. Met. Mater. Superplastic characteristics of the Pb-62%Sn eutectic alloy at room temperature. 31(1994)439.

DOI: 10.1016/0956-716x(94)90015-9

Google Scholar

[6] F.A. Mohamed, Met. Trans. The role of impurities during creep and superplasticity at very low stresses. A33(2002)261-278.

DOI: 10.1007/s11661-002-0088-3

Google Scholar

[7] M.S. Soliman, Scr. Met. Mater. Effect of strain rate and grain size on the ductility of superplastic Pb-62% Sn eutectic alloy at room temperature31(1995)919.

DOI: 10.1016/0956-716x(95)00297-9

Google Scholar

[8] A. Yousefiani, F.A. Mohamed, Met. Trans. Superplatic flow and cavitation in Zn-22% Al doped with Cu. A29(1998)1653-1663.

DOI: 10.1007/s11661-998-0088-z

Google Scholar

[9] K. Duong, F.A. Mohamed, Philos. Mag. Effect of Cd on the boundary sliding behavior of superplastic Pb-62 wt%Sn alloy. A80(2000)2721-2735.

DOI: 10.1080/01418610008216501

Google Scholar

[10] M. Abo-Elhkier, M.S. Soliman, J. Mater. Eng. Perform. Superplastic characteristics of fine grained 7475 aluminum alloy. 15(2006)76.

DOI: 10.1361/105994906x83394

Google Scholar

[11] P.K. Chaudhury, F.A. Mohamed, Acta Metall. Effect of impurity contents on superplastic flow in the Zn-22% aluminum alloy. 36(1988)1099-1110.

DOI: 10.1016/0001-6160(88)90163-0

Google Scholar

[12] F.A. Mohamed, Correlation between creep behavior in Al-based solid solution alloys, powder metallurgy aluminum alloys. Mat. SciEng A. 245 (1998) 242-256.

DOI: 10.1016/s0921-5093(97)00725-9

Google Scholar

[13] E.A. El-Danaf, A.A. Almajid, M.S. Soliman, High temperature deformation and ductility of a modified 5083 Al alloy. J. Mater. Eng. Perform. 17(2008)572-580.

DOI: 10.1007/s11665-007-9173-5

Google Scholar

[14] E.A. Brandes, G.B. Brook, (eds) 1992 Smithells metals reference book (Oxford: Butterworth-Heinemann) 7th edn.

Google Scholar