Effect of compositions on the quenching sensitivity of 7050 and 7085 alloys

Nie, Baohua; Pei-ying, Liu; Tie-tao, Zhou

doi:10.1016/j.msea.2016.04.095

Cited by 66 publications

(17 citation statements)

References 22 publications

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“…Similar to the slow quenching process of Al‐Zn‐Mg‐Cu alloys, 35 the supersaturated solid solution in WNZ tended to decompose after welding, forming overgrowth quench‐induced equilibrium phases and nanoscale precipitates. It has been proved that η equilibrium phases as the result of heterogeneous precipitation appear to be mostly nucleated on pre‐existing incoherent Cr or Zr‐containing dispersoids in slow quench processing of Al‐Zn‐Mg‐Cu alloys 21,36 . For 7085Sc alloy, Zr‐containing dispersoids in the matrix were mainly Al 3 (Sc,Zr); thus, the decomposition process of the supersaturated solid solution in WNZ would be associated with Al 3 (Sc,Zr) particles.…”

Section: Discussionmentioning

confidence: 99%

“…The 7085 aluminum alloy is a newer 7xxx alloy designed for aerospace applications. It has been widely used in many aircraft structural components due to high fracture toughness and low quench sensitivity 19–21 . Because the Cu content of the 7085 alloy exceeds 0.8 wt.%, there are challenges in welding by using fusion welding technologies.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural and fatigue crack growth behavior inhomogeneity of trace Sc added 7085 alloy friction stir welded joint

Jia

Wei

Huang

et al. 2021

Fatigue Fract Eng Mat Struct

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The inhomogeneity of friction stir weld (FSW) joint of a 7085 Al‐based alloy containing trace Sc was investigated by comparing the hardening phase morphology, grain structure, mechanical properties, and fatigue crack growth (FCG) behavior in based metal (BM), heat‐affected zone (HAZ), and weld nugget zone (WNZ). The results showed that microstructural evolution during FSW was remarkably affected by Sc addition. The recrystallization and growth of grains in BM and HAZ were restrained by coherent Al3(Sc,Zr) particles. In HAZ, partially dissolution and slight growth of precipitates resulted in softening but contributed to enhance the FCG resistance according to shear mechanism. In WNZ, high frictional heating and intense plastic deformation induced recrystallization and supersaturated solid solution which decomposed to form new reprecipitates, including many new GPII zones, η′ phases, and some coarse η equilibrium phases attached to grown incoherent Al3(Sc,Zr). Owing to combined influences of fine random orientated grain structure and reprecipitates, WNZ possessed the best fatigue endurance.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural and fatigue crack growth behavior inhomogeneity of trace Sc added 7085 alloy friction stir welded joint

Jia

Wei

Huang

et al. 2021

Fatigue Fract Eng Mat Struct

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show abstract

“…However, the tensile strength of the 7A85 alloy is relatively low compared to that of the 7A55 alloy. The high-strength 7A55 alloy exhibits poor stress corrosion resistance due to the relatively high content of Cu [6][7][8]. 7A99 alloy, developed by Beijing Institute of Aeronautical Materials, is a new ultra-high strength and toughness aluminum alloy that has been used on a preliminary basis in weaponry.…”

Section: Introductionmentioning

confidence: 99%

Influence of Deep Cryogenic Treatment on Microstructure and Properties of 7A99 Ultra-High Strength Aluminum Alloy

Gao

Wang

Chen

et al. 2019

Metals

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The hardness, toughness, wear resistance, and fatigue behavior of materials can be improved through a deep cryogenic treatment (DCT). During this treatment, low temperatures (−100 °C to −196 °C) are maintained and then increased to room or higher. In this work, an indirect-extrusion plate of 7A99 ultra-high strength aluminum alloy was subjected to a T6 (peak aging) treatment and a T6-DCT treatment. The influence of the T6-DCT treatment on the mechanical properties, grain morphologies, precipitates, and atom–cluster distribution was investigated via tensile testing, electron backscatter diffraction, transmission electron microscopy, and three-dimensional atom probe analysis. The tensile strength (maximum: 705 deep cryogenic treatment), yield strength (maximum: 678 MPa), and elongation (maximum: 14%) of the T6-DCT-treated alloy were higher than those of the T6-treated alloy. Moreover, the T6-DCT treatment resulted in (i) grain size refinement and increased uniformity of the microstructure (homogeneous distribution of η’-MgZn2- and η-phase precipitates), and (ii) reduced segregation degree of Zn, Mg, and Cu atoms in the matrix (fraction of small atom clusters (sizes: 10–20 nm, 20–50 nm) increased, fraction of large clusters (size: >1,000 nm) decreased). Therefore, DCT can refine the precipitates and increase the uniformity of the precipitate distribution, thereby improving the strength and plasticity of the alloy.

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“…Fink and Willey first use the TTP curves to investigate the quenching sensitivity of 7075 aluminum alloy [8]. Recently, lots of investigations on quenching sensitivity of some 7xxx aluminum alloys have been reported [9][10][11][12][13][14][15][16]. However, most of the previous research objects are high-Cu containing high strength 7xxx aluminum alloy (AA7050 and AA7055) or middle-Cu containing high strength 7xxx aluminum alloy (AA7085) [9,17,18].…”

Section: Introductionmentioning

confidence: 99%

Study on quenching sensitivity of 7097 aluminum alloy

Xie

Chen

et al. 2019

Mater. Res. Express

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The time-temperature-property (TTP) and the time-temperature-transformation (TTT) curves of 7097 aluminum alloy are determined by interrupted quenching experiments in order to investigate the quench sensitivity. The quenching sensitive zone is 230°C-370°C, and the nose temperature and transformation time are about 320°C and 1.2 s, respectively. The evolution of quench-induced precipitates during different isothermal temperatures treatment has been observed by the transmission electron microscope. The number and size of quench-induced precipitates are gradually increased with the extension of isothermal holding time. Moreover, the quenching sensitivity of 7097 aluminum alloy is lower than that of 7055 aluminum alloy and 7050 aluminum alloy, but higher than that of 7085 aluminum alloy, and the influence of alloy composition on the quenching sensitivity is investigated.

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Effect of compositions on the quenching sensitivity of 7050 and 7085 alloys

Cited by 66 publications

References 22 publications

Microstructural and fatigue crack growth behavior inhomogeneity of trace Sc added 7085 alloy friction stir welded joint

Microstructural and fatigue crack growth behavior inhomogeneity of trace Sc added 7085 alloy friction stir welded joint

Influence of Deep Cryogenic Treatment on Microstructure and Properties of 7A99 Ultra-High Strength Aluminum Alloy

Study on quenching sensitivity of 7097 aluminum alloy

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