Study on Linear Segregation of ZL205A Alloy

Abstract:

Linear segregation of high strength aluminum alloy ZL205A castings were studied by X-ray Nondestructive testing, scanning electron microscope and energy dispersive spectrometer. It is found that the linear segregation occurs at the large wall thickness of the casting and/or at the place where the wall thickness is in transition. Segregation element is mainly Cu, which exists as compound θ (Al₂Cu) phase. The formation of linear segregation is related to the flow of Cu-rich melt in the late solidification period, while the occurrence of thermal cracks promotes the formation of linear segregation. The formation of linear segregation of the casting can be effectively prevented by eliminating hot spots of the casting, refining crystal grains and increasing solidification speed of the casting.

• Periodical: Materials Science Forum (Volume 1020)
• Pages: 8-12
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1020.8
• Online since: February 2021
• Authors: Wu Hu, Ke Zhu, Meng Wang, Wei Dong Huang, Jian Min Zeng*
• Keywords: Casting, Linear Segregation, ZL205A Alloy

References

[1] Jia Panjiang, Chen Bangfeng, Application of ZL205A High Strength and High Quality Casting in Large Aircraft, Materials Engineering, 1(2009) 77-80.

[2] Li Yuanyuan, Guo Guowen, Zhang Weiwen, Luo Zongqiang, Effects of alloying elements on hot tearing trends of Al-Cu alloy, The Chinese Journal of Nonferrous Metals, 11(2001) 791-795.

[3] Dong Shengquan, Zhou Jingen, et al. Elements the Solidification Procession of Casting Aluminum Alloys, Foundry Technology, 23(2002) 50-52.

[4] Li Yusheng, Zhai Hu, et al. The Study on Formative Mechanism of Linearity Segregation of ZL205A Alloy Shelly Casting, Foundry, 55(2006) 1170-1173.

[5] Ding Hao, Fu Hengzhi, et al. Compensation of solidification contraction and hot cracking tendency of alloys[J]. ACTA ETALLURGICA SINICA, 33(1997) 921-926.

[6] Wang Yeshuang, Wang Qudong et al. Research Development of Hot Tear Mechanism for Cast Alloys [J]. Special casting & nonferrous alloys, 02 (2000) 48-50.