Microstructure, Texture and Property of Extruded 7N01 Aluminum Alloy Plates

doi:10.11901/1005.3093.2014.092

Chinese Journal of Materials Research

2014, Vol. 28

Issue (7): 541-548 DOI: 10.11901/1005.3093.2014.092

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Microstructure, Texture and Property of Extruded 7N01 Aluminum Alloy Plates

Ying HUANG^1,^2,^*,Yunlai DENG^1,²(

),Long CHEN^1,²,Fei LIAO^1,²,Xinming ZHANG^1,²

1. Key Laboratory of Nonferrous Materials Science and Engineering, Changsha 410083
2. Key Laboratory of materials science and engineering of Ministry of education of nonferrous metal

Cite this article:

Ying HUANG,Yunlai DENG,Long CHEN,Fei LIAO,Xinming ZHANG. Microstructure, Texture and Property of Extruded 7N01 Aluminum Alloy Plates. Chinese Journal of Materials Research, 2014, 28(7): 541-548.

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Abstract

The effect of natural and artificial aging treatment on tensile properties and corrosion resistance and on the microstructure and texture was investigated respectively by means of mechanical test and of observation with OM, SEM and TEM etc for aluminum alloy 7N01 plates extruded with different extrusion ratio (λ=36 and16). The results show that after natural and artificial aging there exist significant difference in the microstructure and mechanical property for the above mentioned 7N01 plates. There exist a large number of tiny recrystallized grains in the plate with higher-extrusion ratio, while coarse subgrain structures in the plate with lower-extrusion ratio; the former one possesses higher tensile strength and yield strength rather that the later one; while the precipitates at grain boundaries in the former one seemed much discrete with each other. Meanwhile, for the plates extruded with the same extrusion ratio both the tensile strength and elongation were decreased after artificial aging in comparison to those naturally aged, i.e. tensile strength was about 5.8% lower, however the yield strength increased reversely by about 25%; the precipitates at boundaries seemed also much discrete with each other after artificial aging, and thereby exhibited better corrosion resistance.

Key words: metallic materials Al-Zn-Mg alloy extrusion process aging process

Received: 24 February 2014

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	Ying HUANG
	Yunlai DENG
	Long CHEN
	Fei LIAO
	Xinming ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.092 OR https://www.cjmr.org/EN/Y2014/V28/I7/541

Table1 Chemical composition of alloy (%, mass fraction)

Table 2 Slow strain tensile strength and stress corrosion factors I_SSRT of alloy after different treatments

Fig.1 Optical micrographs of 7N01 aluminum alloy in different extrusion ratio: (a) H-A(λ=36); (b) L-A(λ=16)

Fig.2 ODF of samples with different extrusion ratio: (a) higher extrusion ratio(λ=36); (b) lower extrusion ratio (λ=16)

Fig.3 Micrograph of Recrystallized fraction of samples with different extrusion ratio: (a) higher extrusion ratio (λ=36); (b) lower extrusion ratio (λ=16)

Fig.4 Statistical result of recrystallized fraction

Fig.5 PF for different extrusion ratio: (a) higher extrusion ratio (λ=36); (b) lower extrusion ratio (λ=16)

Fig.6 SEM images with different extrusion ratio and EDX results of constituent particles: (a) (c) H-A (λ=36); (b) (d) L-A (λ=16)

7N01铝合金不同挤压比下人工时效试样的透射组织

Fig.8 TEM images of 7N01 aluminum alloy with different extrusion ratio after natural aging: (a) H-N (λ=36); (b) (c) L-N (λ=16)

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