Fast aging strengthening by hybrid precipitates in high pressure die-cast Al-Si-Cu-Mg-Zn alloy

Wang, Dongtao; Liu, Shichao; Zhang, Xiaozu; Li, Xinzhong; Zhang, Haitao; Nagaumi, Hiromi

doi:10.1016/j.matchar.2021.111312

Cited by 15 publications

(5 citation statements)

References 35 publications

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“…In order to investigate the phase's transformations of the HVDC-AE44-2 alloys before and after aging, the HRTEM was used to analyze the phases and microstructures of the HVDC-AE44-2 alloys aged at 200 °C for 12 h and 250 °C for 12 h. Figure 4 is a TEM image of the HVDC-AE44-2 alloys aged at 250 °C for 12 h. It was found that the morphology, size, and distribution of the layered Al 11 RE 3 and the granular Al 2 RE do not change significantly, which is consistent with the results in literature [11,21]. However, the granular precipitate was found in the TEM images and HRTEM after aging (as shown in figures 4(a)−(d)), and the lattice spacing of the precipitate was 0.225nm, which proved to be Al [11,16,17] that the precipitation strengthening can improve the properties of the alloy.…”

Section: The Microstructure and The Phase Analysis Of The Alloysupporting

confidence: 87%

“…The hardness of the Mg-6Zn-4Sn-1Mn alloy reached a peak of 74 HV during the aging at 180 °C for 12 h [15]. Wang [16] et al found that the artificial aging with low temperature and short time can remarkably improve the mechanical properties of the high pressure die casting Al-Si-Cu-Mg-Zn alloy, and as the aging temperature increases from 160 °C to 220 °C, the θ′ nanoscale particles was sufficiently precipitated and improved the strength of the alloys significantly. The results by Su [17] et al showed that the β′ phase was precipitated during the aging, and the strength of the Mg-Gd(-Y)-Zn-Mn alloys were significantly improved by ∼100 MPa.…”

Section: Introductionmentioning

confidence: 99%

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An investigation on the precipitates in T5 treated high vacuum die-casting AE44–2 magnesium alloy

Li¹,

Wang²,

Hai³

et al. 2022

Mater. Res. Express

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The AE44-2 magnesium alloy was fabricated via die-casting under high vacuum (denoted as HVDC-AE44-2 alloy). The microstructures and mechanical properties of the aged HVDC-AE44-2 alloys were investigated. It found that age strengthening can be achieved in the HVDC-AE44-2 alloys. This paper reports, the HVDC-AE44-2 alloys after aging at 200 °C for 12 h (T5), the hardness increased by ~8.8 HV (~14.0%), the yield strength (YS) and the ultimate tensile strength (UTS) increased by ~30.5 MPa (~20.4%) and ~22.6 MPa (~9.1%), respectively, while the increase in strength after aging was not accompanied by a significant loss in ductility (The elongation was 19.6% in the die casting. The elongation was 19.1% in aged at 200°C for 12h). It is found that the improved age hardening ability is closely related to the Al4Mn and Al11Mn4 precipitation during aging. Both the α-Mg and the Al11RE3 have crystallographic orientation relationships with the Al4Mn. The slipping of dislocations was impeded by the precipitates during tensile deformation at room temperature, and the <a> dislocations were accumulated around the precipitates, which is the reason for the increase of the HVDC-AE44-2 alloy strength.

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Section: The Microstructure and The Phase Analysis Of The Alloysupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

An investigation on the precipitates in T5 treated high vacuum die-casting AE44–2 magnesium alloy

Li¹,

Wang²,

Hai³

et al. 2022

Mater. Res. Express

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show abstract

“…The composition of the alloys in this paper was Al-7Si-1.5Cu-0.25Mg, Cu/Mg ≈ 6, and there was no β phase precipitation in the alloys. The precipitation strengthening phases of the alloys were θ and Q phases, and the θ phase was a lath-like precipitate, while the Q phase was a point block precipitate [ 37 , 38 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Cd on Mechanical Properties of Al-Si-Cu-Mg Alloys under Different Multi-Stage Solution Heat Treatment

Mao

Bai²,

Feng³

et al. 2022

Materials

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Multi-stage heat treatment is an important method to improve the mechanical properties of Al-Si-Cu-Mg aluminum alloys. In this paper, the multi-stage heat treatment was carried out for the Cd-free and Cd-containing alloys. The experimental results show that the addition of Cd promoted the precipitation of Q″ and θ″, which led to the formation of a large number of fine, dispersed precipitates and a higher yield strength (YS) and ultimate tensile strength (UTS) for the Cd-containing alloys. The addition of Cd also altered the optimal heat treatment parameters. For the Cd-free alloys, the Cu-rich phase fully dissolved after three-stage heat treatment, and the YS and UTS of the three-stage heat-treated alloys were higher than their two-stage heat-treated counterparts. For the Cd-containing alloys, the three-stage heat treatment led to the precipitation of Cd-rich low melting point phases, caused defects, and reduced the mechanical properties of the alloy. The size and volume fractions of the precipitates were significantly less than those of the alloys after two-stage heat treatment and the strength of the alloys decreased. Therefore, the solution time should be strictly controlled for Cd-containing Al-Si-Cu-Mg alloys.

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“…Zhang et al [ 12 ] found that the Sc element can refine grain and change the morphology of eutectic Si, and form a new nano-precipitated phase to provide an additional fine grain strengthening and precipitation strengthening effect. Wang et al [ 13 ] obtained a mixture of β″-Mg 5 Si 6 , θ’-Al 2 Cu and Q’-Al 5 Cu 2 Mg 8 Si 6 nanoprecipitated phases by adjusting artificial aging parameters, resulting in excellent mechanical properties of Al–Si–Cu–Mg alloy. Fang et al [ 14 ] optimized the two-stage solution treatments of Al–Si–Cu–Mg alloy to obtain a high and uniform solute concentration without overburning of the Cu-containing phase, thus improving the solution strengthening.…”

Section: Introductionmentioning

confidence: 99%

Research Progress on Multi-Component Alloying and Heat Treatment of High Strength and Toughness Al–Si–Cu–Mg Cast Aluminum Alloys

et al. 2023

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Al–Si–Cu–Mg cast aluminum alloys have important applications in automobile lightweight due to their advantages such as high strength-to-weight ratio, good heat resistance and excellent casting performance. With the increasing demand for strength and toughness of automotive parts, the development of high strength and toughness Al–Si–Cu–Mg cast aluminum alloys is one of the effective measures to promote the application of cast aluminum alloys in the automotive industry. In this paper, the research progress of improving the strength and toughness of Al–Si–Cu–Mg cast aluminum alloys was described from the aspects of multi-component alloying and heat treatment based on the strengthening mechanism of Al–Si–Cu–Mg cast aluminum alloys. Finally, the development prospects of automotive lightweight Al–Si–Cu–Mg cast aluminum alloys is presented.

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Fast aging strengthening by hybrid precipitates in high pressure die-cast Al-Si-Cu-Mg-Zn alloy

Cited by 15 publications

References 35 publications

An investigation on the precipitates in T5 treated high vacuum die-casting AE44–2 magnesium alloy

An investigation on the precipitates in T5 treated high vacuum die-casting AE44–2 magnesium alloy

Effect of Cd on Mechanical Properties of Al-Si-Cu-Mg Alloys under Different Multi-Stage Solution Heat Treatment

Research Progress on Multi-Component Alloying and Heat Treatment of High Strength and Toughness Al–Si–Cu–Mg Cast Aluminum Alloys

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