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Effects of manganese on microstructure and mechanical properties of A206 alloys containing iron

Published online by Cambridge University Press:  31 January 2011

Chien-Jung Tseng
Affiliation:
Department of Mechanical Engineering, National Central University, Chung-Li 320, Taiwan, Republic of China
Sheng-Long Lee
Affiliation:
Department of Mechanical Engineering, National Central University, Chung-Li 320, Taiwan, Republic of China
Sheng-Chuan Tsai
Affiliation:
Department of Mechanical Engineering, National Central University, Chung-Li 320, Taiwan, Republic of China
Chia-Jen Cheng
Affiliation:
Department of Mechanical Engineering, National Central University, Chung-Li 320, Taiwan, Republic of China
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Abstract

The effects of Mn and Fe contents on the mechanical properties of aluminum-based A206 alloys were investigated quantitatively. Results showed that the addition of Fe caused a loss in both ductility and yield strength. Further addition of Mn could recover the ductility, but it caused a further loss in yield strength. In low-Mn alloys (0.29 wt% Mn) the primary constituent was the needle shape of Cu2FeAl7. Upon further addition of Mn, the Chinese script configuration of Mn-bearing particles formed instead. The Cu2Mn3Al20 particles formed in high-Mn alloys during solution treatment and resulted in grain-growth inhibition. The needle, Mn-bearing, and Cu2Mn3Al20 particles caused the solid solution level of copper in the matrix to decrease; meanwhile, increasing the Mn solution level retarded the precipitation of the strengthening phase. Differential scanning calorimetry analyses showed the kinetics and amount of decrease in θ′ phase precipitation when the contents of Fe and/or Mn were increased. The smaller grain size induced by the Cu2Mn3Al20 particles and the θ′ phase were the factors that determined the hardness of A206 alloys under as-quenched and T7-treated conditions, respectively.

Type
Articles
Copyright
Copyright © Materials Research Society 2002

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References

REFERENCES

1.Davidson, N.J., Current Aluminum Research and Application (AFS, Des Plaines, IL, 1988), p. 232.Google Scholar
2.Kearney, A.L. and Raffin, J., AFS Trans. 85, 559 (1977).Google Scholar
3.Bäckerud, L., Chai, G., Tamminen, J., Solidification Characteristics of Aluminum Alloys (AFS/Skan Aluminum, Universitetsforlaget AS, Oslo, Norway, 1990), Vol. 2, p. 63.Google Scholar
4.Properties and Selection: Nonferrous Alloys and Pure Metals, Metals Handbook, 9th ed. (ASM Metals Park, OH, 1987), Vol. 2, p. 152.Google Scholar
5.Tseng, C.J., Lee, S.L., Wu, T.F., and Lin, J.C., Mater. Trans. JIM 41, 708 (2000).CrossRefGoogle Scholar
6.Tan, Y.H., Lee, S.L., and Lin, Y.L., Metall. Trans. A 26A, 2937 (1995).Google Scholar
7.Warng, P.S., Liauh, Y.J., Lee, S.L., and Lin, J.C., Mater. Chem. Phys. 53, 195 (1998).Google Scholar
8.Starink, M.J. and Van, P. Mourik, Metall. Trans. A 22A, 665 (1991).Google Scholar
9.Jena, A.K., Gupta, A.K., and Chaturvedi, M.C., Acta Metall. 37, 885 (1989).Google Scholar
10.Papazian, J.M., Metall. Trans. A 13A, 761 (1982).CrossRefGoogle Scholar
11.Wang, P.S., Lee, S.L., Lin, J.C., and Jahn, M.T., J. Mater. Res. 15, 2027 (2000).CrossRefGoogle Scholar
12.Yie, S.N., Lee, S.L., Lin, Y.H., and Lin, J.C., Mater. Trans. JIM 40, 294 (1999).CrossRefGoogle Scholar
13.Jacob, S. and Fantaine, D., Fonderie 294, 326 (1970).Google Scholar
14.Couture, A., AFS Int. Cast Metals J. 6(4), 9 (1981).Google Scholar
15.Murali, S., Raman, K.S., and Murthy, K.S.S., AFS Int. Cast Metals J. 6(4), 189 (1994).Google Scholar
16.Mollard, F.R., AFS Trans. 79, 443 (1970).Google Scholar
17.Mondolfo, L.F., Aluminum Alloys: Structure and Properties (Butterworths, London, U.K., 1976), pp. 324, 491, 505, 635.CrossRefGoogle Scholar
18.AMS 4235A (Aerospace Material Specification, SAE International, Warrendale, PA, 1987).Google Scholar
19.Petzow, G. and Effenberg, G., Ternary Alloys (VCH, New York, 1991), Vol. 4, p. 573.Google Scholar
20.Russ, J.C., Practical Stereology (Plenum Press, New York, 1986), p. 35.CrossRefGoogle Scholar
21.Biroli, G., Caglioti, G., Martini, L., and Riontino, G., Scripta Mater. 39, 197 (1998).CrossRefGoogle Scholar
22.Robinson, D.L. and Hunter, M.S., Metall. Trans. A 3, 1147 (1972).CrossRefGoogle Scholar
23.Miyake, J., Ghosh, G., and Fine, M.E., MRS Bull. 21(6), 13 (1996).CrossRefGoogle Scholar
24.Barghout, J.Y., Lorimer, G.W., Pilkington, R., and Prangnell, P.B., Mater. Sci. Forum, 217–222, 975 (1996).Google Scholar
25.Hatch, J.E., Aluminum: Properties and Physical Metallurgy (ASM, Metals Park, OH, 1984), p. 205.Google Scholar