Surface gradient nanostructures in high speed machined 7055 aluminum alloy

Chen, Yanxia; Yang, Yanqing; Feng, Zongqiang; Huang, Bin; X, Luo

doi:10.1016/j.jallcom.2017.08.018

Cited by 40 publications

(10 citation statements)

References 41 publications

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“…Table 4 shows the calculation results of the average size of the precipitated phase. In 7055 aluminum alloys, Zn and Mg are the main elements of the precipitated phase MgZn 2 [26,27]. The shape variables of the aluminum alloy are controlled by changing the amount of reduction during the rolling process.…”

Section: Precipitation Phase Sizementioning

confidence: 99%

Characterization of Precipitation in 7055 Aluminum Alloy by Laser Ultrasonics

Zhu

Peng

et al. 2021

Metals

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After different rolling conditions, four 7055 aluminum alloy samples with different precipitation sizes were measured by scanning electron microscope, transmission electron microscope and laser ultrasonic. The attenuation coefficients of ultrasound measured by laser ultrasonic were calculated in the time domain, frequency domain and wavelet denoising, respectively. The relationship between the precipitate size and attenuation coefficient was established. The results show that the attenuation of the ultrasonic wave is related to the size of the precipitated phase; this provides a new method for rapid non-destructive testing of the precipitation of aluminum alloys.

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Section: Precipitation Phase Sizementioning

confidence: 99%

Characterization of Precipitation in 7055 Aluminum Alloy by Laser Ultrasonics

Zhu

Peng

et al. 2021

Metals

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“…After T7452 heat treatment, sample I contains both semi-coherent η and incoherent η precipitates with an average radius of 6.27 ± 1.05 nm (Figure 8a). Generally speaking, in 7xxx series Al alloys, the strengthening mechanism of either bypassing or cutting precipitates is determined primarily by the precipitate radius [40,44]. Our previous research shows that when the precipitate size reaches 3 nm, the shearing mechanism of the 7085 Al alloy transforms to the Orowan bypassing mechanism [20].…”

Section: Discussionmentioning

confidence: 99%

Study on the Relationship between High Temperature Mechanical Properties and Precipitates Evolution of 7085 Al Alloy after Long Time Thermal Exposures

Zang

Dai

Yang

et al. 2021

Metals

Self Cite

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The requirement for 7085 Al alloy as large airframe parts has been increasing due to its low quenching sensitivity and high strength. However, the relationship between high temperature mechanical properties and the evolution of precipitates in hot environments is still unclear. In this work, thermal exposure followed by tensile tests were conducted on the 7085 Al alloy at various temperatures (100 °C, 125 °C, 150 °C and 175 °C). Variations of hardness, electrical conductivity and tensile properties were investigated. The evolution of the nano scale precipitates was also quantitatively characterized by transmission electron microscopy (TEM). The results show that the hardness and electrical conductivity of the alloy are more sensitive to the temperature than to the time. The strength decreases continuously with the increase of temperature due to the transformation from η′ to η phase during the process. Furthermore, the main η phase in the alloy transformed from V3 and V4 to V1 and V2 variants when the temperature was 125 °C. Additionally, with increasing the temperature, the average precipitate radius increased, meanwhile the volume fraction and number density of the precipitates decreased. The strengthening effect of nano scale precipitates on tensile properties of the alloy was calculated and analyzed.

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“…For deformation-assisting solute and precipitation, precipitate dissolution, solute diffusion and precipitate reprecipitation have to be considered. [32] Mechanical processing, in this case the SFT, may induce dissolution since the accumulation of deformation in the precipitates can wreck their crystal structures and therefore lead to precipitate dissolution. [21] The degree of the dissolution is dependent on the strain and strain rate, which are related to the depth from the SFTed surface.…”

Section: Precipitate Redistributionmentioning

confidence: 99%

Mechanical Behavior and Strengthening Mechanisms in Precipitation-Strengthened Aluminum Alloy with Gradient Structure Induced by Sliding Friction Treatment

Huo

et al. 2020

Metall Mater Trans A

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The flat surfaces of a 7075 aluminum (Al) alloy plate were processed by sliding friction treatment (SFT), which is a technique for surface nanocrystallization of metals and alloys. The aim of this study was to investigate the microstructural evolution, mechanical behavior and strengthening mechanisms in this SFTed precipitation-strengthened Al alloy. The SFT resulted in a gradient structure (GS) with an effective depth of~800 lm, and a nanostructured layer was formed within a depth of~30 lm from the surface. Increasing boundary spacing and decreasing misorientation angle between boundaries were found with increasing depth from the surface, which was accompanied by a decrease in hardness from~2436 MPa in the topmost surface layer to~1568 MPa in the undeformed coarse grain (CG) matrix. Moreover, the GS revealed a prominent precipitate redistribution induced by the SFT. The GS revealed higher strength and especially exhibited a higher work-hardening rate at low strain (e < 0.026) than the CG, attributed to a novel coupling of dislocations, boundaries and precipitates. Grain boundary strengthening, dislocation strengthening, precipitation strengthening and synergetic strengthening in the GS were quantitatively evaluated based on sufficient discussion.

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Surface gradient nanostructures in high speed machined 7055 aluminum alloy

Cited by 40 publications

References 41 publications

Characterization of Precipitation in 7055 Aluminum Alloy by Laser Ultrasonics

Characterization of Precipitation in 7055 Aluminum Alloy by Laser Ultrasonics

Study on the Relationship between High Temperature Mechanical Properties and Precipitates Evolution of 7085 Al Alloy after Long Time Thermal Exposures

Mechanical Behavior and Strengthening Mechanisms in Precipitation-Strengthened Aluminum Alloy with Gradient Structure Induced by Sliding Friction Treatment

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