Welcome to American Journal of Materials Science and Engineering

American Journal of Materials Science and Engineering is a peer-reviewed, open access journal that provides rapid publication of articles in all areas of materials science and engineering. The goal of this journal is to provide a platform for scientists and academicians all over the world to promote, share, and discuss various new issues and developments in different areas of materials science and engineering.

ISSN (Print): 2333-4665

ISSN (Online): 2333-4673

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Website: http://www.sciepub.com/journal/AJMSE

   

Article

Evaluation of Aluminium Alloy for Plasticity Applications

1Department of Mechanical Engineering, University of Agriculture, Makurdi, Nigeria

2Department of Research, Collaboration and Consultancy, National Centre for Technology Management (NACETEM), Abuja, Nigeria


American Journal of Materials Science and Engineering. 2015, 3(1), 1-6
doi: 10.12691/ajmse-3-1-1
Copyright © 2015 Science and Education Publishing

Cite this paper:
J.D. Amine, K. Abubakar, L.T. Tuleun. Evaluation of Aluminium Alloy for Plasticity Applications. American Journal of Materials Science and Engineering. 2015; 3(1):1-6. doi: 10.12691/ajmse-3-1-1.

Correspondence to: K.  Abubakar, Department of Research, Collaboration and Consultancy, National Centre for Technology Management (NACETEM), Abuja, Nigeria. Email: kz4tawa@gmail.com

Abstract

An evaluation of aluminium alloy for plasticity applications was undertaken to bridge the gap in appraising the impact of variation of alloying elements such as magnesium (Mg) and copper (Cu) on plasticity as a mechanical property of the aluminium alloy. To this end, twenty seven (27) samples of aluminium alloys were produced with constituents drawn from 6 % zinc (Zn), 2.5 % - 3.5 % magnesium (Mg), 1.8 % - 3.0 % copper (Cu), 0.03 % manganese (Mn), 0.23 % chromium (Cr) and aluminium (Al) as balance in all cases. 0.1 gram of sulphur (S), which the same as the quantity of iron (Fe) in chromium (Cr) and manganese (Mn), was added to oxidize (eradicate) iron (Fe). Samples were subjected to hardness test; to measure the ability of the alloy to resist plastic deformation and percentage elongation (% e) to unveil the mechanical properties of the alloy. Maximum Vickers hardness (Hv) of 130.7 was displayed by an alloy of 6 % zinc (Zn), 2.5 % magnesium (Mg), 1.8 % copper (Cu), 0.03 % manganese (Mn), 0.23 % chromium (Cr) and aluminium, quenched in water at 490°C and soaked for five (5) hours. The same alloy, non-heat treated, displayed a least Hv of 91.5. Hardness increased from 91.5 Hv in an alloy of 2.5 percentage weight of magnesium to 120.3 Hv in an alloy of 3.5 percentage weight of magnesium. Maximum percentage elongation (% e) of 130.00 was recorded by an alloy of 3.5 % Mg and 2.5 % Cu. A least percentage elongation of 12.00 % was established in an alloy of 3.5 % Mg and 3.0 % Cu. The experiment observed that with increase in percentage weight of magnesium from 2.5 % - 3.0 % - 3.5 %, there was variation from 25.67-18.67- 130.00 respectively in percentage elongation. The alloy with 3.5 % Mg, 1.8 % Cu was recommended for plasticity (% elongation) applications. Investigation of the impacts of other constituents on this alloy may be considered.

Keywords

References

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Article

Contribution of the GP Zones to the Hardening and to the Electrical Resistivity in Al10at.%Ag Alloy

1Solids solutions laboratory, physics faculty USTHB, BP 32, El-Alia, Algiers, Algeria


American Journal of Materials Science and Engineering. 2015, 3(1), 7-10
doi: 10.12691/ajmse-3-1-2
Copyright © 2015 Science and Education Publishing

Cite this paper:
Faiza Lourdjane, Azzeddine Abderrahmane Raho. Contribution of the GP Zones to the Hardening and to the Electrical Resistivity in Al10at.%Ag Alloy. American Journal of Materials Science and Engineering. 2015; 3(1):7-10. doi: 10.12691/ajmse-3-1-2.

Correspondence to: Azzeddine  Abderrahmane Raho, Solids solutions laboratory, physics faculty USTHB, BP 32, El-Alia, Algiers, Algeria. Email: lourdjane_faiza@yahoo.fr; raho_azzeddine@yahoo.fr

Abstract

Using microhardness and electrical resistivity measurements, the contributions of the matrix and that of the Guinier-Preston zones to the hardening and to the electrical resistivity of the Al10at.%Ag alloy are determined separately during the Guinier-Preston zones precipitation. A linear correlation between the hardness and the electrical resistivity of the as quenched alloys exists. There is also a linear relationship between the contribution of the matrix to the hardening and that to the electrical resistivity of the isothermal aged alloy. However, no linear relation exists between the hardness and the electrical resistivity of the isothermal aged alloy.

Keywords

References

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[6]  K.Matsumoto, S.Y. Komatsu, M. Ikeda, B. Verlinden, B. Ratchev, “Quantification of volume fraction of precipitates in an aged Al−1.0 mass%Mg2Si alloy”MaterialsTransactions, 2000, 41 (10) 1275-1281.
 
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Article

Precipitation Kinetics of the GP Zones in Al4,65at.% Ag(15%Wt.)

1Solids solutions laboratory, physics faculty USTHB, BP 32, El-Alia, Algiers, Algeria


American Journal of Materials Science and Engineering. 2015, 3(1), 11-14
doi: 10.12691/ajmse-3-1-3
Copyright © 2015 Science and Education Publishing

Cite this paper:
Faiza Lourdjane, Azzeddine Abderrahmane Raho. Precipitation Kinetics of the GP Zones in Al4,65at.% Ag(15%Wt.). American Journal of Materials Science and Engineering. 2015; 3(1):11-14. doi: 10.12691/ajmse-3-1-3.

Correspondence to: Azzeddine  Abderrahmane Raho, Solids solutions laboratory, physics faculty USTHB, BP 32, El-Alia, Algiers, Algeria. Email: raho_azzeddine@yahoo.fr

Abstract

The precipitation of the Guinier-Preston zones in Al4,65at.% Ag(15%wt.), studied using an electrical resistivity measurements technique during an isothermal aging, follows a nucleation, growth and coarsening stages. The particles growth obeys the JMAK law while their coarsening, the LSW theory. The diffusion coefficient of the solute atoms, during the GP zones formation at 125°C, is in the order of (8,69 ± 2,17).10-21m2/s. The electrical resistivity of the alloy results from the contribution of the Guinier-Preston zones and that of the matrix. Due to the weak Guinier-Preston volume fraction, the electrical resistivity of the alloy is essentially due to the matrix contribution.

Keywords

References

[1]  Koji Inoke, Kenji Kaneko “Severe local strain and the plastic deformation of Guinier-Preston zones in the Al–Ag system revealed by three-dimensional electron tomography «Acta Materialia 54 (2006) 2957-2963.
 
[2]  A.M. Abd El-Khalek, « Transformation characteristics of Al-Ag and Al-Ag-Ti alloys » Journal of alloys and compounds 459, (2008) 281-285.
 
[3]  PH, A, Dubey. «Shape and internal structure of Guinier-Preston zones in Al-Ag» Acta metall.mater 39 (1991)1161-1170.
 
[4]  B.Schönfeld, A. Malik, G. Korotz, W.Bürher and J.S.Pedersen «Guinier-Preston zones in Al-rich Al-Cu and Al-Ag single crystals ».Physica B234-236 (1997) 983-985.
 
[5]  K.Matsumoto, S.Y. Komatsu, M. Ikeda, B. Verlinden, B. Ratchev, “Quantification of volume fraction of precipitates in an aged Al−1.0 mass%Mg2Si alloy”MaterialsTransactions, 2000, 41 (10) 1275-1281.
 
Show More References
[6]  Raeisinia B., Poole W.J., Lloyd D.J., “Examination of precipitation in the aluminum alloy AA6111 using electrical resistivity measurements.” Materials Science and Engineering A, 2006, 420 (1-2), 245-249.
 
[7]  J. B. Nelson, D. B. Riley, “An experimental investigation of extrapolation methods in the derivation of accurate unit-cell dimensions of crystals.”, 3rd Proc. Phys. Soc. London, 57 (1945), p. 160-177.
 
[8]  A.J.Hillel, J.T. Edwards, P.Wilkes, “Theory of the resistivity and Hall effect in alloys during Guinier-Preston zone formation.”, Philiosophical Magazine 1975, 32 (1), 189-209.
 
[9]  P.L.Rossiter, P.Wells, “The dependence of electrical resistivity on short-range order.”, Journal of Physics, 1971, 4 354-363.
 
[10]  M. Rosen, E. Horowitz, L. Swartzendruber, S. Fick and R. Mehrabian. “The aging process in aluminium 2024 studied by means of eddy currents.” Mater. Sci. and Engineering 53 (1982), p.191
 
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