Hot-tearing susceptibility of Al–Zn alloys

Баженов, В. Е.; Пикунов, М. В.; Safronova, A. A.; Tselovalnik, Yu. V.

doi:10.1134/s0036029517090026

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…[ 25 ] The HTS of Al–Zn binary alloys has also been studied. However, due to the inconsistency seen in the plots of composition against HTS observed by different researchers, [ 17,26 ] a lambda curve could not be constructed. This is explained by a significant change in the curvature of the solidus line in the Al–Zn phase diagram which manifests itself in significant changes in the partition coefficient of zinc.…”

Section: Introductionmentioning

confidence: 99%

“…The decrease in the HTS at anything more than 25% Zn content was related to a significant fraction of the nonequilibrium eutectic and its predominant influence on the HTS. [ 26 ] Pumphrey and Lyons [ 27 ] tested alloys of 2–20% Zn using the ring test and found a peak in the HTS at 6%. Clyne and Davies [ 28 ] tested alloys of 5–50% Zn using a restrained bar mold, finding the percentage cracking to be constant over the range 5–40% before dropping dramatically between 40 and 50%.…”

Section: Introductionmentioning

confidence: 99%

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Hot Tear Formation During the Casting of Al–Zn Binary Alloys

Yang,

Wu,

Zeng

et al. 2023

Adv Eng Mater

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The hot tearing susceptibility of Al–Zn binary alloys with solute contents of Al–0.5%Zn, Al–1%Zn, Al–2%Zn, and Al–4%Zn, with all compositions being in wt%, is investigated through physical experiments and numerical simulation. The temperature at the hot spot, the designed critical point for hot tearing, and the load at the end of the test bar are measured and compared with the simulation results. The test samples with 0.5 and 1.0% Zn show hot tears while those with 2.0 and 4.0% Zn have no sign of such tearing. The correlation between solid fraction, strain, stress, and hot tearing indicator is revealed using the simulation results of the Al–1%Zn and Al–4%Zn alloys. Just before solidification, the Al–1%Zn alloy is found to have not only a much higher strain rate at the hot spot of the test bar than that of the Al–4%Zn alloy, but also a higher strain gradient along the longitudinal direction. It is believed that both the high strain rate and high strain gradient are attributable to the formation of hot tears in the Al–1%Zn alloy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hot Tear Formation During the Casting of Al–Zn Binary Alloys

Yang,

Wu,

Zeng

et al. 2023

Adv Eng Mater

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Design of Mg Zn Si Ca casting magnesium alloy with high thermal conductivity

Баженов

Колтыгин

Sung

et al. 2020

Journal of Magnesium and Alloys

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Investigation of castability, mechanical, corrosion properties and flammability of ML-OPB and EWZ43 magnesium alloys

Баженов

Baranov

Lyskovich

et al. 2023

Izv.VUZ. Tsvet. Met.

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Magnesium alloys are usually considered as structural materials when the weight reduction is important - in aircraft and space industry for example. In recent years, there has been an increase in the use of new generation ignition-proof high-strength magnesium alloys in the design of aircraft parts. The properties of new ignition-proof casting magnesium alloys ML-OPB (Mg–6.7Y–2.6Zn–0.5Zr–0.35Ce– 0.35Yb; wt.%) and EWZ43 (Mg–3.8Y–4.4Nd–0.6Zr–0.6Zn; wt.%) were investigated and compared with properties of commercial magnesium alloys. The microstructure of investigated alloys in the as-cast condition comprises of a magnesium solid solution and a significant amount of eutectic. Heat treatment according to the T6 mode results in change in the eutectic phase’s morphology and also to their partial dissolution in the magnesium matrix. Long-term high-temperature holding, simulating operating conditions (500 h at 300 °C), leads to the formation of precipitates along the grain boundaries in both alloys, significantly reducing the mechanical properties. During the oxidation of the samples, it was established that the main components that involved into the oxide film and provides the protective properties of the alloys is Y, Nd and Yb. The investigated alloys have a high strength, which is not lower than that of the ML10 alloy. At the same time, the advantage of the ML-OPB alloy is a high elongation at fracture, while the EWZ43 alloy is characterized by high strength. The corrosion rate of the investigated alloys exceeds the corrosion rate of known commercial ML10 and AZ91 alloys, which implies the need for additional protection against corrosion of investigated alloys. At the same time, the castability of ML-OPB and EWZ43 alloys is no lower than that of most commercial magnesium alloys. An oxide film with high Y content and high protective properties is formed when the alloys interact with the sand mold bonded with furan resin. The ignition temperature of the investigated alloys is 100–150 °C higher than that of the ML10 alloy. The flammability test of alloys in the flame of a gas burner, made on cone samples and typical aircraft castings «bracket», showed that ML-OPB and EWZ43 alloys are almost non-flammable under the conditions of experiment.

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Hot-tearing susceptibility of Al–Zn alloys

Cited by 3 publications

References 15 publications

Hot Tear Formation During the Casting of Al–Zn Binary Alloys

Hot Tear Formation During the Casting of Al–Zn Binary Alloys

Design of Mg Zn Si Ca casting magnesium alloy with high thermal conductivity

Investigation of castability, mechanical, corrosion properties and flammability of ML-OPB and EWZ43 magnesium alloys

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