Determining hot cracking index of Al–Mg–Zn casting alloys calculated using effective solidification range

Поздняков, А. В.; Zolotorevskiy, V. S.; Мамзурина, О. И.

doi:10.1179/1743133615y.0000000029

Cited by 15 publications

(14 citation statements)

References 10 publications

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“…The hot cracking index (HCI) was experimentally tested with a pencil probe [2,18]. The pencil probe allows quickly and easily assessing hot cracking.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and materials characterisation of the novel Al–Cu–Y alloy

Поздняков¹,

Barkov²

2018

Materials Science and Technology

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The microstructure, hot cracking susceptibility, and mechanical properties of a novel Al–Cu–Y alloy were investigated. The Al–4.7Cu–1.6Y alloy demonstrated very good casting properties, hot cracking susceptibility that is similar to Al–Si–Mg alloys. Analysis of the solidification process showed that the primary Al solidification is followed by the eutectic reaction Liquid→ τ1(Al8Cu4Y)+Al and the peritectic reactions Liquid+ τ6(Al,Cu)11Y3)→Al+ τ1(Al8Cu4Y) (612°C) and Liquid+ η(AlCu)→ τ1(Al8Cu4Y)+ θ(Al2Cu) (595°C). The τ1(Al8Cu4Y) eutectic phase demonstrated high thermal stability during homogenisation treatment. The recrystallisation temperature was in the range 250–350°C after rolling with previous quenching at 540 and 590°C and without heat treatment. The recommended annealing mode for material in the as-rolled condition is 100°C for 1 h: YS = 273 MPa, UTS = 305 MPa and El. = 6.6%.

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“…The hot cracking index (HCI) was experimentally tested with a pencil probe [2,18]. The pencil probe allows quickly and easily assessing hot cracking.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and materials characterisation of the novel Al–Cu–Y alloy

Поздняков¹,

Barkov²

2018

Materials Science and Technology

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“…The cylinder bars obtained in the SM had a diameter of 24 mm and length of 290 mm with a weight of about 800 g. The SM bars were used for tensile test sample preparation. The hot tearing sensitivity was measured using "pencil probe", and the hot cracking index (HCI) was determined [2][3][4][5].…”

Section: Alloys Preparationmentioning

confidence: 99%

“…The Al-Cu-(Mg) alloys demonstrate a good strength at room and elevated temperatures but exhibit low casting properties and corrosion resistance [1][2][3][4]. The high strength wrought Al-Zn-Mg-(Cu) alloys lack low casting and corrosion properties, and low heat resistance [1][2][3]5,6]. General principles of eutectic forming elements alloying were employed to enhance the castability and heat resistance of both groups of alloys [4,5,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…The high strength wrought Al-Zn-Mg-(Cu) alloys lack low casting and corrosion properties, and low heat resistance [1][2][3]5,6]. General principles of eutectic forming elements alloying were employed to enhance the castability and heat resistance of both groups of alloys [4,5,7,8]. A novel approach to developing crossover alloys based on using aluminum alloy scraps was presented [9].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, this alloy could be classified as a crossover alloy, based on the Al-Cu/Al-Zn-Mg-(Cu) systems, with additional alloying by rare earth metals. As a result, the novel Al-3Zn-3Mg-3Cu-Zr-Y(Er) alloy combines the improved casting properties of the cast A-Zn-Mg alloys [1,3,5,6], good strength of the Al-Zn-Mg-Cu alloys [1], and improved heat resistance of the Al-Cu alloy [1,2,4]. Zn, Mg, and Cu in the ratio used provide aging strengthening due to nucleation of the T' precipitates [13,16,21].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Phase Composition of Novel Crossover Al-Zn-Mg-Cu-Zr-Y(Er) Alloys with Equal Zn/Mg/Cu Ratio and Cr Addition

Glavatskikh,

Barkov,

Gorlov

et al. 2024

Metals

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The effect of 0.2%Cr addition on the structure, phase composition, and mechanical properties of the novel cast and wrought Al-2.5Zn-2.5Mg-2.5Cu-0.2Zr-Er(Y) alloys were investigated in detail. Chromium is distributed between primary crystals (5.7–6.8%) of the intermetallic phase and the aluminum solid solution (0.2%) (Al). The primary crystals contain for the main part Cr, Ti, Er(Y). The experimental phase composition is in good correlation with the thermodynamic computation data. The micron-sized solidification origin phases (Al8Cu4Er(or Y) and Mg2Si) and supersaturated (Al) with nano-sized Al3(Zr,Ti) and E (Al18Mg3Cr2) precipitates are presented in the microstructure of the novel alloys after solution treatment. The nucleation of η (MgZn2) (0.5%), S (Al2CuMg) (0.4%), and T (Al,Zn,Mg,Cu) (8.8%) phase precipitates at 180 °С, providing the achievement of a maximum hardness of 135 HV in the Al2.5Zn2.5Mg2.5CuYCr alloy. The corrosion potential of the novel alloy is similar to the Ecor of the referenced alloy, but the corrosion current density (0.68–0.98 µA/sm2) is still significantly lower due to the formation of E (Al18Mg3Cr2) precipitates and S phase precipitates of the aging origin, in addition to the T phase. The formation of E (Al18Mg3Cr2) precipitates under the solution treatment provides a lower proportion of recrystallized grains (2.5–5% vs. 22.4–25.1%) and higher hardness (110 HV vs. 85–95 HV) in the Cr-rich alloys compared to the referenced alloys. Solution treated, hot and cold rolled, recrystallized, water quenched and aged at 210 °С alloys demonstrate an excellent microstructure stability and tensile properties: YS = 299–300 MPa, UTS = 406–414 MPa, and El. = 9–12.3%.

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