Microstructure and Properties of Rapidly Solidified Al-Zn-Mg-Cu Alloy

Abstract:

Refining grain plays an important role in improving the mechanical properties of aluminum alloys. However, the conventional casting method with a slow cooling rate can be easy to cause coarseness of the microstructure and serious segregation. In this paper, the rapid solidification of Al-Zn-Mg-Cu alloy was prepared by the single-roller belt method. The alloy strip was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and hardness test to study the microstructure and properties of the rapidly solidified aluminum alloy. The results show that the roller speed was an important parameters affecting the formability of the alloy. When the roller speed was 15 m/s, the aluminum alloy produced a thin bandwidth of 5 mm and a thickness of 150 um. As the rotation speed of the roller increased, the cooling rate of the melt increased, and the microstructure of the rapidly solidified Al-Zn-Mg-Cu aluminum alloy strip improved in grains refinement. Compared with the conventionally cast Al-Zn-Mg-Cu aluminum alloys, the Al-Zn-Mg-Cu aluminum alloys prepared by rapid solidification showed much finer crystal grains, and enhanced solid solubility of alloying elements with less precipitation of second phase and high hardness.

• Periodical: Materials Science Forum (Volume 993)
• Pages: 203-207
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.993.203
• Online since: May 2020
• Authors: Wei Min Ren, Zi Yong Chen*, Zhi Lei Xiang, Li Hua Chai
• Keywords: Al-Zn-Mg-Cu Alloy, Mechanical Properties, Microstructure, Rapid Solidification

References

[1] Heinz, A. Haszler A, et al. Recent development in aluminum alloys for aerospace applications [J]. Materials Science and Engineering: A. 2000, 280(1): 102-107.

DOI: 10.1016/s0921-5093(99)00674-7

[2] Liu Xiaotao, Cui Jianzhong, Wang Eng ang, et al. Influence of a low-frequency electromagnetic field on precipitation behavior of a high strength aluminum alloy [J]. Materials Science & Engineering A, 2005, 402:1.

DOI: 10.1016/j.msea.2005.01.010

[3] Srivatsan T S, Anand S, Sriram S, et al. The high-cycle fatigue and fracture behavior of aluminum alloy 7055 [J]. Materials Science and Engineering: A. 2000, 281(1): 292-304.

DOI: 10.1016/s0921-5093(99)00716-9

[4] LIU J, KULAK M. A new paradigm in the design of aluminum alloys for aerospace applications [J]. Materials Science Fourum, 2000, 331/337(1): 127-140.g.

DOI: 10.4028/www.scientific.net/msf.331-337.127

[5] Kamp N, Sinclair I, starink M J. Toughness-strength relations in the overaged 7449 Al-based alloy. [J]. Metallurgical and Materials Transactions A, 2002, 33A: 1125.

DOI: 10.1007/s11661-002-0214-2

[6] Davies C H J, Raghuathan N, Sheppard T. Structure-property relationships of Sic reinforced Al-Zn-Mg-Cu alloy [J]. Materials Science and technology, 1992, 8: 977.

DOI: 10.1179/mst.1992.8.11.977

[7] Li H, Cao F, Guo S, et al. Effects of Mg and Cu on microstructures and properties of spray-deposited Al-Zn-Mg-Cu alloys [J]. Journal of Alloys and Compounds, 2017, 719: 89-96.

DOI: 10.1016/j.jallcom.2017.05.101

[8] Lin Y, Mao S, Yan Z, et al. Melt spinning induces sub-micrometric/micrometric grained structure and dislocations in 7075 Al alloy [J]. Journal of Alloys and Compounds, 2015, 651: 699-704.

DOI: 10.1016/j.jallcom.2015.08.146

[9] Cai Y. H, Liang R. G, Su Z. P, et al. Microstructure of spray formed Al-Zn-Mg-Cu alloy with Mn addition [J]. Transactions of Nonferrous Metals Society of China, 2011, 21(1): 9-14.

DOI: 10.1016/s1003-6326(11)60671-7

[10] Chen Z, Mo Y, Nie Z. Effect of Zn Content on the Microstructure and Properties of Super-High Strength Al-Zn-Mg-Cu Alloys [J]. Metallurgical and Materials Transactions A. 2013, 44(8): 3910-3920.

DOI: 10.1007/s11661-013-1731-x