Study on Refinement Mechanism of Sc and Zr as-Cast Al-7.2Zn-2.2Mg-1.8Cu Alloys

Zhi Gang Wang; Jun Xu; Bao Li; Zhi Feng Zhang

doi:10.4028/www.scientific.net/AMM.372.66

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 372Study on Refinement Mechanism of Sc and Zr as-Cast...

Study on Refinement Mechanism of Sc and Zr as-Cast Al-7.2Zn-2.2Mg-1.8Cu Alloys

Abstract:

The effect of trace Sc and Zr on grain refinement of Al-7.2Zn-2.2Mg-1.8Cu as-cast ingot was studied by using optical microscopy and scanning electron microscopy with EDS. The results show that addition of only 0.20% Zr or 0. 20% Sc to Al-7.2Zn-2.2Mg-1.8Cu alloy can refine grains to a certain degree, and the addition of 0.10% Sc+0.20%Zr leads to stronger grain refinement, the average grain size is only 10-15μm. Al₃Sc/Al₃Zr composite particles in the melt work as the nucleation of heterogeneous nucleation during solidification.

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Applied Mechanics and Materials (Volume 372)

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66-69

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.372.66

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Online since:

August 2013

Authors:

Zhi Gang Wang, Jun Xu, Bao Li, Zhi Feng Zhang

Keywords:

Al₃(Sc,Zr), Al-Zn-Mg-Cu, Grain Refinement, Heterogeneous Nucleation

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References

[1] WU Y L, FROES F H, ALVARFZ A, LI C G, LIU J.: Microstructure and properties of a new super-high-strength Al-Zn-Mg-Cu alloy C912 [J] Materials and Design, 1997, 18(4): 211-215.

DOI: 10.1016/s0261-3069(97)00084-8

Google Scholar

[2] NAKAI M, ETO T. New aspects of development of high strength aluminum alloys for aerospace applications [J]. Materials Science and Engineering 2000, A285: 62-68.

DOI: 10.1016/s0921-5093(00)00667-5

Google Scholar

[3] GAO Ying-jun, ZHONG Xia-ping, LiU Hui, WU Wei-ming. Valence electronic structures of Al-Mg alloy with minor Sc and Zr and its effect on grain refinement [J] Guangxi Sciences, 2003, l0(1): 32-35.

Google Scholar

[4] HE Yong-dong, ZHANG Xin-ming. Refinement mechanism of trace Cr, Mn, Ti and Zr as-cast 7A55 alloys [J] The Chinese Journal of Nonferrous Metals, 2005, 15(10): 1594-1601.

Google Scholar

[5] Verma R, Ghosh A K, Kim S, et al. Grain refinement and superplasticity in 5083 Al[J]. Materials Science and Engineering, 1995, A191(12): 143-150.

DOI: 10.1016/0921-5093(94)09644-9

Google Scholar

[6] TurskiM. Precipitation kinetics of Al3Zr dispersoids in 7xxx aluminum alloys [D]. Manchester: University of Manchester, (2001).

Google Scholar

[7] Srivatsan T S, Sriram S, Veeraraghavan D, et al. Microstructure, tensile deformation and fracture behavior of aluminum alloy 7055[J]. Journal of Materials Science, 1997, 32(11): 2883-2894.

DOI: 10.1023/a:1018676501368

Google Scholar

[8] Easton M A, Stjohn D H. A model of grain refinement incorporating alloy constitution and potency of heterogeneous nucleant particle [J]. Acta Materialia, 2001, 49(10): 1867-1878.

DOI: 10.1016/s1359-6454(00)00368-2

Google Scholar