Properties and Microstructure of an Al-Zn-Mg-Cu Alloy Forging

Xi Wu Li; Bai Qing Xiong; Yong An Zhang; Zhi Hui Li; Hong Wei Liu; Feng Wang; Shu Hui Huang; Hong Wei Yan

doi:10.4028/www.scientific.net/AMR.1120-1121.1019

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1120-1121Properties and Microstructure of an Al-Zn-Mg-Cu...

Properties and Microstructure of an Al-Zn-Mg-Cu Alloy Forging

Abstract:

In this study, the inhomogeneous properties and microstructure at typical position of an Al-7.5Zn-1.6Mg-1.4Cu-0.11Zr alloy forging in T7452 condition have been investigated using OM, SEM, TEM and EBSD analysis, tensile properties testing, conductivity measurement and fracture toughness testing. The results indicate that wherein the properties near the surface layer and in the core of the alloy forging exhibit a difference of 10% or more. There are obvious differences in grain morphology, quench-introduced precipitation and recrystallization degree in the two positions. Due to the high quenching temperature, there appears a heavy quench-introduced precipitation phenomenon in the core more than surface layer of the alloy forging, which improves the electrical conductivity, but significantly reduces the strength of the final material. And there is a higher proportion of the recrystallization organization in the core of the alloy forging, seriously affecting its elongation and fracture toughness. Microstructure inhomogeneity of the alloy forging determines the uniformity of its properties.

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Periodical:

Advanced Materials Research (Volumes 1120-1121)

Pages:

1019-1023

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1120-1121.1019

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Online since:

July 2015

Authors:

Xi Wu Li*, Bai Qing Xiong, Yong An Zhang, Zhi Hui Li, Hong Wei Liu, Feng Wang, Shu Hui Huang, Hong Wei Yan

Keywords:

Al-Zn-Mg-Cu Alloy, Forging, Inhomogeneous, Microstructure, Properties

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