Mechanical Properties of Extrusions of Spray Formed 7055 Al Alloy

doi:10.11901/1005.3093.2013.099

Chinese Journal of Materials Research

2014, Vol. 28

Issue (12): 914-918 DOI: 10.11901/1005.3093.2013.099

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Mechanical Properties of Extrusions of Spray Formed 7055 Al Alloy

Jisen QIAO(

),Hao XIA,Tiandong XIA,Wenjun ZHAO,Han ZHANG,Ruifeng DUAN

State Key Laboratory of Gansu Advanced Nonferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050

Cite this article:

Jisen QIAO,Hao XIA,Tiandong XIA,Wenjun ZHAO,Han ZHANG,Ruifeng DUAN. Mechanical Properties of Extrusions of Spray Formed 7055 Al Alloy. Chinese Journal of Materials Research, 2014, 28(12): 914-918.

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Abstract

The effect of indirect extrusion process and T76 heat treatment on microstructure evolution and mechanical properties of the spray formed 7055 alloy was investigated by means of optical microscopy, SEM, EDS and XRD as well as mechanical testing. The results show that the as-sprayed billet has an equiaxed and homogeneous structure with grain sizes of 20-40μm and without macro-segregation. After indirect extrusion and T76 heat treatment, the billets were fully densified with a certain amount of recrystallized grains. The ultimate tensile strength of the alloy after T76 heat treatment reaches 680MPa with 10% elongation.

Key words: metallic materials 7055 aluminum alloy heat treatment microstructure mechanical properties high-strength aluminum alloy

Received: 21 February 2014

Fund: *Supported by Key Programs for Science and Technology Development of Gansu Province No.1203GKDJ004 and Project of Gansu Technology Foundation for Overseas Scholar No.1001ZBS113.

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	Jisen QIAO
	Hao XIA
	Tiandong XIA
	Wenjun ZHAO
	Han ZHANG
	Ruifeng DUAN

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.099 OR https://www.cjmr.org/EN/Y2014/V28/I12/914

Table 1 Chemical composition of 7055 aluminum alloy (%, mass fraction)

Fig.1 Microstructure of as-deposited billet

Fig.2 SEM image of as-deposited billet

Fig.3 Microstructure of as-extruded samples after T76 heat treatment (a) Longitude; (b) Transverse

Fig.4 XRD pattern of as-deposited sample

Fig.5 XRD pattern of as-extruded sample after T76 treatment

Fig.6 SEM analysis of precipitated phase of as-deposited sample (a), spot analysis results of EDS (b), Line scanning analysis on transversal microstructure of as-extruded sample, (c) and Line scanning analysis on longitudinal microstructure of as-extruded sample (d)

Table 2 Mechanical properties in different areas of extrusion profile

Fig.7 SEM photographs of tensile fracture surface of as-extruded samples after heat treatment (a) overall morphology of the transversal tensile specimen, (b) high magnification of (a), (c) overall morphology of the longitudinal tensile specimen, (d) high magnification of (c)

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