Effect of combined addition of Zr, Ti and Y on microstructure and tensile properties of an Al-Zn-Mg-Cu alloy

Zhang, Yingbo; Li, Mojia; Hu, Yunfeng; Zeng, Qinghua; Zhang, Pu

doi:10.1016/j.matdes.2022.111129

Cited by 35 publications

(4 citation statements)

References 52 publications

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“…Slightly higher strengthening was achieved after a two-step solution treatment. The Er-or Y-containing precipitates that formed during the solution treatment may affect the aging process [40][41][42][43][44][45]. The size and distribution of the precipitates after a one-and two-step solution treatment are different.…”

Section: Hardening Under Aging Treatment and Mechanical Propertiesmentioning

confidence: 99%

“…Based on these two principles, novel heat-resistant cast and wrought Al alloys were developed [38,39]. Trace additives of Er or Y in Al-Zn-Mg-Cubased alloys affect the aging strengthening and corrosion resistance [40][41][42][43][44][45]. As a result, two basic principles should be taken into consideration to develop novel heat-resistant Al-Zn-Mg-Cu-based alloys with improved casting properties: 1-mass ratio of Zn/Mg = 1, and 2-atomic ratio of Cu/Y(Er) = 4.…”

Section: Introductionmentioning

confidence: 99%

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Novel Cast and Wrought Al-3Zn-3Mg-3Cu-Zr-Y(Er) Alloys with Improved Heat Resistance

Главатских

Barkov

Gorlov

et al. 2023

Metals

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The main weaknesses of commercial high-strength Al-Zn-Mg-Cu-based alloys are the low casting properties, corrosion and heat resistance. Al-Zn-Mg-Cu-based alloys with Zn/Mg ratio equal to 1 combine good strength, corrosion and heat resistance. Al alloys with atomic ratio Cu/Y(Er) equal to 4 have a narrow solidification range and high solidus temperature. Two basic principles were taken into consideration to develop novel heat-resistant Al-Zn-Mg-Cu-based alloys with improved casting properties: 1—mass ratio of Zn/Mg = 1, and 2—atomic ratio of Cu/Y(Er) = 4. The microstructure, phase transformation and tensile properties of the novel cast and wrought Al–3Zn–3Mg–3Cu–0.2Zr–Y(Er) alloys were investigated. The structure and phase composition were investigated via thermodynamic calculation, optical and scanning electron microscopy and X-ray diffraction methods. A two-step solution treatment with higher temperature in the second step provides a microstructure with better elongation, making possible to increase the hot rolling temperature of the Y or Er-containing alloys. The yield strength (YS) of the alloys decreased insignificantly from 270 to 290 MPa at room temperature to 225 to 260 MPa at 200 °C after casting, solution treatment, water quenching and aging. A better combination of the YS = 291–345 MPa and elongation (El.) (11–14.8%) was achieved in the Al3Zn3Mg3CuY and Al3Zn3Mg3CuEr alloys after solution treatment, rolling, recrystallization annealing, water quenching and aging compared with the Al3Zn3Mg3Cu alloy with YS = 245–340 MPa and El. = 6.8–12.5%.

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Section: Hardening Under Aging Treatment and Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Cast and Wrought Al-3Zn-3Mg-3Cu-Zr-Y(Er) Alloys with Improved Heat Resistance

Главатских

Barkov

Gorlov

et al. 2023

Metals

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“…In Al-Zn-Mg-Cu alloys, adding Y element alone could refine dendrite substructure and increase the proportion of equiaxed crystals. The combined addition of Zr, Ti and Y could simultaneously refine the grain and dendrite substructure, and the tensile strength could reach about 700 MPa [81]. The synergistic strengthening of rare earth Y with transition elements Zr and Ti might be related to the formation of Al 8 Cu 4 Y and Al 3 (Zr,Y) phases in the nanonetwork structure.…”

Section: Effect Of the Phase Of The Y On The Al-zn-mg-cu Alloymentioning

confidence: 99%

Research Status and Prospective Properties of the Al-Zn-Mg-Cu Series Aluminum Alloys

Wang

2023

Metals

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An Al–Zn–Mg–Cu alloy has high specific strength, good corrosion resistance, fracture toughness and fatigue resistance. It is one of the most important structural materials in the fields of aviation, aerospace, weapons and transportation; in particular, it plays a huge role in the field of aerospace. In order to optimize the strength, toughness and corrosion properties of an Al–Zn–Mg–Cu alloy, the focus of research on this alloy has always been on the alloying process. The effects of the main alloying elements, trace alloying elements and rare earth elements on the microstructure and properties of Al–Zn–Mg–Cu alloys are briefly introduced in this paper, and future research directions are proposed.

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“…The microstructure examination shows that the base alloy has lamellar Mg(Zn, Cu, Al) 2 phases in as-cast condition (figure 3(b), (d), (f) and (h)) and second phases distributed along the grain boundary in assolutionized condition (figure 3(j), (i), (n) and (p)). Previous studies have shown that the distribution of coarse brittle particles along the grain boundary will have a negative impact on the properties [20]. Therefore, subsequent plastic deformation of the alloy, such as extrusion and rolling, will break the second phases and make it uniform distribute in the matrix.…”

Section: Future Outlookmentioning

confidence: 99%

Effect of yttrium content on microstructure and tensile properties of as-cast and as-solutionized Al-Zn-Mg-Cu alloys

Hu²,

Zhang³

et al. 2023

Mater. Res. Express

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Four kinds of 7xxx series aluminum alloys with different Y contents were obtained by ordinary gravity casting. The effect of Y content on the microstructure and mechanical properties of as-cast and as-solutionized Al-7.9Zn-3Mg-2.4Cu-0.13Zr (wt.%) alloys were investigated by means of X-ray diffraction (XRD), electron backscattering diffraction (EBSD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and room-temperature tensile tests. The results shows that, in as-cast condition, Y element can refine the grain and reduce the content of Mg(Zn, Cu, Al)2 lamellar phases at the interdendritic. (Al, Zn)8Cu4Y block-shaped phases form in interdendritic regions. After solution treatment, the undissolved Mg(Zn, Cu, Al)2 phases evolved from lamellar to bulk-like which distribution in interdendritic, but no obvious change in (Al, Zn)8Cu4Y phase. The tensile testing results shows that the optimal Y content is 0.45 wt.%. At 0.45 wt.% Y, the ultimate tensile strength and elongation are 267 MPa and 2.4% in as-cast condition and 420 MPa and 3.6% in as-solutionized condition.

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Effect of combined addition of Zr, Ti and Y on microstructure and tensile properties of an Al-Zn-Mg-Cu alloy

Cited by 35 publications

References 52 publications

Novel Cast and Wrought Al-3Zn-3Mg-3Cu-Zr-Y(Er) Alloys with Improved Heat Resistance

Novel Cast and Wrought Al-3Zn-3Mg-3Cu-Zr-Y(Er) Alloys with Improved Heat Resistance

Research Status and Prospective Properties of the Al-Zn-Mg-Cu Series Aluminum Alloys

Effect of yttrium content on microstructure and tensile properties of as-cast and as-solutionized Al-Zn-Mg-Cu alloys

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