Journal ArticleDOI
Effects of hot extrusion and heat treatment on microstructure and properties of industrial large-scale spray-deposited 7055 aluminum alloy
Yonggang Yang,Yutao Zhao,Xizhou Kai,Zhen Zhang,Hao Zhang,Ran Tao,Gang Chen,Houshang Yin,Min Wang +8 more
- Vol. 5, Iss: 1, pp 016519
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TLDR
In this article, the industrial large-scale 7055 aluminum alloy fabricated by spray forming technology was subjected to hot extrusion and heat treatment to achieve high strength and ductility, and the results showed that the alloy after T7X temper treatment exhibits higher electrical conductivity (>35 % IACS) and facture toughness (>25.6 MPa m1/2) although a 8%-17% reduction in strength compared with that at T6 temper.Abstract:
The industrial large-scale 7055 aluminum alloy fabricated by spray forming technology was subjected to hot extrusion and heat treatment to achieve high strength and ductility. Microstructure of the as-deposited alloy indicates that higher density billets with equiaxed grains (20–40 μm) were fabricated rather than a typical dendritic microstructure of the as-cast alloy. The grains of the as-extruded alloy exhibit fibrous morphology, the original boundaries disappear and fined second phases with size about 0.5–5 μm distribute along with extrusion direction. Meanwhile, the defects could be eliminated by hot extrusion, which resulted in good strength as well as ductility. The ultimate tensile strength, yield strength and elongation of the as-extruded alloy are 345 MPa, 236 MPa and 18.5%, respectively. After heat treatment, the partial recrystallization is observed around the un-recrystallized grains and sub-grains. And the platelet/rod-shaped precipitates (MgZn2) show a uniform distribution in the matrix alloy. The alloy reaches the maximum tensile strength of 730 MPa after T6 temper treatment, associated with a fine precipitation (MgZn2). However, with further deepen aging degree (from T6 to T73 temper), the size of dominant precipitated phases (MgZn2) grows obviously, the grain boundary precipitates transform from continuous to individual ones and the width of precipitate free zone increases. The result shows that the alloy after T7X temper treatment exhibits higher electrical conductivity (>35 %IACS) and facture toughness (>25.6 MPa m1/2) although a 8%–17% reduction in strength compared with that at T6 temper.read more
Citations
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Journal ArticleDOI
Microstructure and mechanical properties of an Al-Zn-Cu-Mg alloy processed by hot forming processes followed by heat treatments
Muhammad Abubaker Khan,Yangwei Wang,Mohamed A. Afifi,Abdul Malik,Faisal Nazeer,Ghulam Yasin,Bao Jiawei,Hao Zhang +7 more
TL;DR: In this paper, the microstructure and tensile properties of an Al-Zn-Cu-Mg alloy processed by spray formed then hot forming processes (forging and extrusion at 703
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Effects of solution temperature and cooling rate on α phases and mechanical properties of a forged Ti-55511 alloy
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Effect of Welding Wires Containing ZrB2 Particles on Microstructure and Mechanical Properties of Spray-Formed 7055 Aluminum Alloy TIG Welded Joints
TL;DR: In this paper, a series of welding wires with ZrB2 particles were developed by the in situ reaction, and they were successfully introduced into the spray-formed 7055 aluminum alloy welded joints by TIG welding.
Journal ArticleDOI
SiC/graphene reinforced aluminum metal matrix composites prepared by powder metallurgy: A review
TL;DR: In this paper , a review of the work which has been done to improve the properties of AMMCs by incorporating SiC and Graphene particles is presented, and the challenges and their remedies in making Al-SiC or Al-Graphene composite are also addressed.
Journal ArticleDOI
Effect of severe plastic deformation on structure refinement and mechanical properties of the Al-Zn-Mg-Fe-Ni alloy
I. G. Brodova,Dmitriy Rasposienko,I. G. Shirinkina,Anastasia Petrova,Torgom Akopyan,Elena Bobruk +5 more
TL;DR: In this article, the authors identify the mechanisms of phase and structural transformations during severe plastic deformation by shearing under pressure (high pressure torsion) of an Al-Zn-Mg-Fe-Ni-based aluminum alloy depending on different initial states of the material (an ingot after homogenizing annealing and a rod produced by radial-shear rolling).
References
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Journal ArticleDOI
Structure-property correlations in Al 7050 and Al 7055 high-strength aluminum alloys
TL;DR: In this article, the information available from different studies conducted on alloys Al 7050 and Al 7055 was collated to prepare maps that are intended to serve as guides to design aluminum alloys with desired combination of properties.
Journal ArticleDOI
Heat treatment of 7xxx series aluminium alloys—Some recent developments
TL;DR: In this paper, the effects of homogenization, solution treatment, quenching and ageing treatments on the evolution of the microstructure and properties of some important medium to high-strength 7xxx alloys are described.
Journal ArticleDOI
On the nature of T(Al2Mg3Zn3) and S(Al2CuMg) phases present in as-cast and annealed 7055 aluminum alloy
TL;DR: In this article, a combination of light microscopy, scanning electron microscopy (SEM), electron probe micro analysis (EPMA) and X-ray diffraction (XRD) was used to examine AA 7055 alloy compositions.
Journal ArticleDOI
The Hall–Petch relation in aluminium and its dependence on the grain boundary structure
J.W. Wyrzykowski,M.W. Grabski +1 more
TL;DR: In this paper, the mechanical properties of aluminium polycrystals exhibiting differences in grain boundary (GB) properties have been studied by means of the Hall-Petch analysis and the results obtained indicate that th...
Journal ArticleDOI
The effect of RRA on the strength and SCC resistance on AA7050 and AA7150 aluminium alloys
TL;DR: The effect of retrogression and re-aging (RRA) on the strength and stress corrosion cracking (SCC) performance was evaluated in AA7050 and AA7150 aluminum alloys.