Insight into the partial solutionisation of a high pressure die-cast Al-Mg-Zn-Si alloy for mechanical property enhancement

Yang, Wenchao; Liu, Lin; Zhang, Jun; Ji, Shouxun

doi:10.1016/j.msea.2016.11.028

Cited by 10 publications

(2 citation statements)

References 12 publications

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“…T' and T'' phases) are often observed in Al-Mg-Zn alloys [5, 7, 8, 19, 20, 25, 26] [22, 23]. However, it was also reported that the precipitate in several cast Al-Mg-Zn alloys with non-negligible Cu or Si levels, including Al-10.2Mg-3.2Zn-2.7Si aged at 160°C [30], Al-8.1Mg-3.5Zn-2.6Si aged at 180°C [10] and Al-5Mg-3.09Zn-1.0Cu aged at 150°C [21], is g' phase. It indicates that the phase transformation between g' and T' or T'' phases in Al-Mg-Zn alloys maybe exists.…”

Section: Solidification Path and Microstructural Evolutionmentioning

confidence: 99%

The development of low-temperature heat-treatable high-pressure die-cast Al–Mg–Fe–Mn alloys with Zn

et al. 2021

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In the present work, a novel low-temperature heat-treatable recycled die-cast Al–Mg alloy was developed by adding Zn into non-heat-treatable Al–5Mg–1.5Fe–0.5Mn alloy. The results showed that Zn additions resulted in the formation of equilibrium phase T-Mg32(Al, Zn)49 under as-cast condition, which can be dissolved into the α-Al matrix at a relatively low solution temperature (430 °C) and thus set the base for the low-temperature heat treatment. The mechanical test results indicated that Zn additions had a smooth liner improvement in the strength of all as-cast alloys and T6-state alloys with 1% and 2% Zn as its concentration increased but resulted in a sharp improvement on the strength of T6-state alloy when Zn concentration increased from 2 to 3%. TEM analysis revealed that the precipitate in T6-state Al–5Mg–1.5Fe–0.5Mn–3Zn alloy is η′ phase, rather than the widely reported T″ or T′ phase in other Al–Mg–Zn alloys with approximately same Mg and Zn concentrations. After the optimized low-temperature T6 heat treatment (solution at 430 °C for 60 min and ageing at 120 °C for 16 h), the Al–5Mg–1.5Fe–0.5Mn–3Zn alloy exhibits the yield strength of 321 MPa, ultimate tensile strength of 445 MPa and elongation of 6.2%.

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Section: Solidification Path and Microstructural Evolutionmentioning

confidence: 99%

The development of low-temperature heat-treatable high-pressure die-cast Al–Mg–Fe–Mn alloys with Zn

et al. 2021

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“…The heat treatment of the die casting is realized while avoiding the foaming deformation of the casting, and the strength of the casting is improved by the low temperature solid solution aging. Wenchao Yang [8] studied a partial solution treatment process to improve the mechanical properties of die-cast Al-Mg-Zn-Si alloy which successfully increased the alloy ultimate tensile strength(UTS) from 350 MPa to 362 MPa, solutioning at 430°C for 1 h. However, in the study of Al-Mg-Zn-Si die-casting alloys, the effects of various elements such as Ti, Cu and Fe on the microstructure and properties of Al-Mg-Zn-Si die-cast alloys are lacking.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti on microstructure and mechanical properties of die-cast Al-Mg-Zn-Si alloy

Zhang

Yan

Zhao

et al. 2020

Mater. Res. Express

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The Al-11.0Mg-2.6Si-4.0Zn-0.6Mn (wt%) alloy is a new developed high strength die cast alloy which can be used for structural parts in the automotive and aerospace industry. In this study, the effect of various amount of Ti on microstructure evolution and mechanical properties of Al-11.0Mg-2.6Si-4.0Zn-0.6Mn (wt%) alloy under as-cast and T6 heat treatment conditions are investigated. The addition of Ti results in the formation of Al 3 Ti intermetallic phase, and the volume fraction and forming temperature increases with the increase of titanium content. With 0.1wt% Ti addition, the best mechanical properties of the alloy. The yield strength (YS), ultimate tensile strength (UTS) and elongation reach up to 350 MPa, 440 MPa and 3.29% respectively after heat treatment. Titanium content should be controlled below 0.10%.

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Effect of Zn Concentration on the Microstructure and Mechanical Properties of Al-Mg-Si-Zn Alloys Processed by Gravity Die Casting

Zhu

et al. 2018

Metall Mater Trans A

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The microstructure and mechanical properties of Al-8.1Mg-2.6Si-(0.08 to 4.62)Zn alloys (in wt pct) have been investigated by the permanent mold casting process. X-ray diffraction analysis shows that the s-Mg 32 (Al, Zn) 49 phase forms when the Zn content is 1.01 wt pct. With higher Zn contents of 2.37 and 3.59 wt pct, the g-MgZn 2 and s-Mg 32 (Al, Zn) 49 phases precipitate in the microstructure, and the g-MgZn 2 phase forms when the Zn content is 4.62 wt pct. Metallurgical analysis shows that the g-MgZn 2 and s-Mg 32 (Al, Zn) 49 phases strengthen the Al-8.1Mg-2.6Si-(0.08 to 4.62)Zn alloys. After solutionizing at 510°C for 180 minutes and aging at 180°C for 90 minutes, the g¢-MgZn 2 phase precipitates in the a-Al matrix, which significantly enhances the mechanical properties. Addition of 3.59 wt pct Zn to the Al-8.1Mg-2.6Si alloy with heat treatment increases the yield strength from 96 to 280 MPa, increases the ultimate tensile strength from 267 to 310 MPa, and decreases the elongation from 9.97 to 1.74 pct.

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Insight into the partial solutionisation of a high pressure die-cast Al-Mg-Zn-Si alloy for mechanical property enhancement

Cited by 10 publications

References 12 publications

The development of low-temperature heat-treatable high-pressure die-cast Al–Mg–Fe–Mn alloys with Zn

The development of low-temperature heat-treatable high-pressure die-cast Al–Mg–Fe–Mn alloys with Zn

Effect of Ti on microstructure and mechanical properties of die-cast Al-Mg-Zn-Si alloy

Effect of Zn Concentration on the Microstructure and Mechanical Properties of Al-Mg-Si-Zn Alloys Processed by Gravity Die Casting

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