Segregation of Solute Atoms in Hot Rolled Aluminum Alloy LT24

doi:10.11901/1005.3093.2014.260

Chinese Journal of Materials Research

2014, Vol. 28

Issue (12): 919-924 DOI: 10.11901/1005.3093.2014.260

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Segregation of Solute Atoms in Hot Rolled Aluminum Alloy LT24

Hui LI^1,^3,^**(

),Bo WANG^1,⁴,Wenqing LIU¹,Shuang XIA²,Bangxin ZHOU²,Cheng SU³,Wenyan DING³,Yansong CHEN³

1. Key Laboratory for Microstructures, Shanghai University, Shanghai 200444
2. Institute of Materials, Shanghai University, Shanghai 200072
3. Zhejiang Jiuli Hi-Tech Metals Co., Ltd., Huzhou 313000
4. Guiyang Vocational and Technical College, Guiyang 550081

Cite this article:

Hui LI,Bo WANG,Wenqing LIU,Shuang XIA,Bangxin ZHOU,Cheng SU,Wenyan DING,Yansong CHEN. Segregation of Solute Atoms in Hot Rolled Aluminum Alloy LT24. Chinese Journal of Materials Research, 2014, 28(12): 919-924.

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Abstract

The segregation of solute atoms in hot rolled LT24 aluminum alloy was investigated by atom probe tomography. The results show that a precipitate with composition of Al_0.5Mg(Si_0.7Cu_0.3) can be observed in the grains. No solute segregation can be observed at the interface between precipitates and the matrix. However solute atoms, such as Mg, Si and Cu all tend to segregate at grain boundaries, but the segregation tendency of Cu is much stronger than that of Mg and Si. The concentration of Cu at grain boundaries is 45 times of that at the matrix. Based on the experimental results, the feature of solute segregation and its effect on the performance of the alloy are discussed.

Key words: metallic materials aluminum alloy segregation precipitates grain boundary atom probe tomography

Received: 20 May 2014

Fund: *Supported by National Natural Science Foundation of China No.51301103, China Postdoctoral Science Foundation No.2013M541507, Key Project of Shanghai Science and Technology Commission No.12JC1404000, and Innovation Fund of Shanghai University.

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	Articles by authors
	Hui LI
	Bo WANG
	Wenqing LIU
	Shuang XIA
	Bangxin ZHOU
	Cheng SU
	Wenyan DING
	Yansong CHEN

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.260 OR https://www.cjmr.org/EN/Y2014/V28/I12/919

Fig.1 Optical micrograph of the specimens (vertical direction is the hot rolling direction)

Fig.2 Three dimensional distribution of Mg, Si, Cu atoms in the interior of grain of the specimen

Fig.3 One dimensional concentration profile across the precipitate, the cross section of the data is 10 nm ×10 nm

Fig.4 Three dimensional distribution of Mg, Si and Cu atoms at the grain boundary of the specimen, the observation directions are parallel (a) and perpendicular (b) to the grain boundary

Fig.5 Concentration distribution at the grain boundary. One dimensional concentration profile of Mg, Si, Cu (a) and cumulative concentration profile of Mg, Si, Cu (b) across the grain boundary. The dash line in Fig.(a) indicates the position of grain boundary

Table 1 Enrich factor (S_av) and Gibbs interface excess (Γ, ×10¹⁸/m²)

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