Mechanical properties and thermal stability of 7055 Al alloy by minor Sc addition

Liu, Chong-yu; Teng, G. B.; Ma, Z.Y.; Wei, Liang; Zhou, Wenbiao; Huang, Hongfeng; Qi, Haiquan

doi:10.1007/s12598-018-1190-z

Cited by 21 publications

(2 citation statements)

References 28 publications

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“…The addition of Sc in 7055 aluminum alloy could cause grain boundary effect [ 5 , 6 ], effectively refining the grains, which has a good promoting effect on the hardness, tensile strength, ductility and thermal stability [ 7 , 8 , 9 ]. But its high cost is not conducive to large-scale industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sm + Er and Heat Treatment on As-Cast Microstructure and Mechanical Properties of 7055 Aluminum Alloy

Wang

2023

Materials

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The 7055 aluminum alloy is an ultra-high strength aluminum alloy, which is widely used in the aerospace field and new energy automobile manufacturing industry. As it retains high strength, its plastic deformation ability needs to be improved, which limits its application in plastic processing. In this study, the cast grains of the 7055 aluminum alloy were refined by adding Sm + Er, and the proper heat treatment procedure was utilized to further precipitate the rare earth phase in order to increase the alloy’s strength and toughness. The grain size, microstructure and phase were characterized by optical microscopes (OMs), scanning electron microscopy—energy spectrum (SEM-EDS) and a XRD diffractometer (XRD). The macroscopic hardness, yield strength and tensile strength of alloy materials were measured by a hardness meter and universal electronic tensile machine. The results showed that the as-cast sample and the heat treatment sample all contained Al10Cu7Sm2 and Al8Cu4Er rare earth phases. But, after heat treatment, the volume percentage of the rare earth phase dramatically increased and the dispersion was more unified. When 0.3 wt.%Sm and 0.1 wt.%Er were added, the grain size could be refined to 53 μm. With the increase in the total content of rare earth elements, the refining effect first increased and then decreased. Under 410 °C solid solution for 2 h + 150 °C and aging for 12 h, the macroscopic hardness, yield strength, tensile strength and elongation of 0.3 wt.%Sm + 0.1 wt.%Er + 7055 as-cast samples were 155.8 HV, 620.5 MPa, 658.1 MPa and 11.90%, respectively. After the addition of Sm and Er elements and heat treatment, the grain refinement effect of 7055 aluminum alloy was obvious and the plastic property was greatly improved under the premise of maintaining its high-strength advantage.

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Section: Introductionmentioning

confidence: 99%

Effect of Sm + Er and Heat Treatment on As-Cast Microstructure and Mechanical Properties of 7055 Aluminum Alloy

Wang

2023

Materials

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“…The material of the main force-bearing components of aircraft have been using aluminum alloy for a long time [1,2] , among which 7055 aluminum alloy proposing high strength, high fracture toughness, and excellent resistance to fatigue crack expansion are widely used as monolithic components in the manufacture of aircraft skins, spars, bulkheads, gangways, landing gears, etc. [3,4,5] . Aviation aluminum alloy monolithic components are usually processed by highspeed milling.…”

Section: Introductionmentioning

confidence: 99%

Research on Influence of Milling Process Parameters on Residual Stress of 7055 Aluminum Alloy

Wang

Yang

et al. 2022

J. Phys.: Conf. Ser.

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The residual stress induced by the process of high-speed milling is an essential factor affecting the machining deformation of structural materials. The two-dimensional modeling and numerical simulation of high-speed milling of 7055 aluminum alloy were carried out to investigate the influence of key milling process parameters on the surface residual stress of aluminum alloy, using finite element approach. Through single factor simulation experiment and multi-factor orthogonal simulation experiment, the effects of milling speed, feed rate, milling depth, milling width, rake angle and relief angle on the surface residual stress of aluminum alloy were discussed. The optimized parameter scheme was obtained by range analysis method. The results demonstrate that the surface residual stress of 7055 aluminum alloy increases with the increase of milling speed, feed per tooth and milling depth, and decreases with the increase of milling width; Using the optimized milling scheme (milling speed 2000 m / min, feed per tooth 0.1 mm / z, tool relief angle 4 °, tool rake angle 16 °, milling depth 10 mm, milling width 10 mm) could reduce the surface tensile residual stress; while using the optimized scheme (milling depth 10 mm, tool rake angle 16 °, milling width 4 mm, feed per tooth 0.5 mm / z, milling speed 4000 m / min) could reduce the surface compressive residual stress.

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Hot deformation behavior and dynamic softening mechanism for extreme-cooled 7055 aluminum alloy

Rui

et al. 2022

Appl. Phys. A

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Mechanical properties and thermal stability of 7055 Al alloy by minor Sc addition

Cited by 21 publications

References 28 publications

Effect of Sm + Er and Heat Treatment on As-Cast Microstructure and Mechanical Properties of 7055 Aluminum Alloy

Effect of Sm + Er and Heat Treatment on As-Cast Microstructure and Mechanical Properties of 7055 Aluminum Alloy

Research on Influence of Milling Process Parameters on Residual Stress of 7055 Aluminum Alloy

Hot deformation behavior and dynamic softening mechanism for extreme-cooled 7055 aluminum alloy

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