Microstructure and mechanical properties of high strength die-casting Al–Mg–Si–Mn alloy

Hu, Zhenjiang; Wan, Li; Wu, Shusen; Wu, Han; Liu, Xueqiang

doi:10.1016/j.matdes.2012.10.020

Cited by 45 publications

(20 citation statements)

References 19 publications

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“…The small amount (0.2%) of Fe has also been reported to increase the fatigue life of the present alloy by forming a small amount of Fe-containing intermetallics [43]. Furthermore, Hu et al [66] reported that the fatigue life increases with increasing content of magnesium as well, which is~5.5 wt.% in the present alloy. The fatigue life of a material could be described by the Basquin's equation and Coffin-Manson relationship for the high-cycle and low-cycle fatigue lives, respectively.…”

Section: Fatigue Behavioursupporting

confidence: 56%

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Cyclic Deformation Behavior of A Heat-Treated Die-Cast Al-Mg-Si-Based Aluminum Alloy

Mohammed

Gupta

et al. 2020

Materials

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The purpose of this investigation was to study the low-cycle fatigue (LCF) behavior of a newly developed high-pressure die-cast (HPDC) Al-5.5Mg-2.5Si-0.6Mn-0.2Fe (AlMgSiMnFe) alloy. The effect of heat-treatment in comparison with its as-cast counterpart was also identified. The layered (α-Al + Mg2Si) eutectic structure plus a small amount of Al8(Fe,Mn)2Si phase in the as-cast condition became an in-situ Mg2Si particulate-reinforced aluminum composite with spherical Mg2Si particles uniformly distributed in the α-Al matrix after heat treatment. Due to the spheroidization of intermetallic phases including both Mg2Si and Al8(Fe,Mn)2Si, the ductility and hardening capacity increased while the yield stress (YS) and ultimate tensile strength (UTS) decreased. Portevin–Le Chatelier effect (or serrated flow) was observed in both tensile stress–strain curves and initial hysteresis loops during cyclic deformation because of dynamic strain aging caused by strong dislocation–precipitate interactions. The alloy exhibited cyclic hardening in both as-cast and heat-treated conditions when the applied total strain amplitude was above 0.4%, below which cyclic stabilization was sustained. The heat-treated alloy displayed a larger plastic strain amplitude and a lower stress amplitude at a given total strain amplitude, demonstrating a superior fatigue resistance in the LCF regime. A simple equation based on the stress amplitude of the first and mid-life cycles ((Δσ/2)first, (Δσ/2)mid) was proposed to characterize the degree of cyclic hardening/softening (D): D=±(Δσ/2)mid − (Δσ/2)first(Δσ/2)first, where the positive sign “+” represents cyclic hardening and the negative sign “−“ reflects cyclic softening.

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Section: Fatigue Behavioursupporting

confidence: 56%

Section: Resultsmentioning

confidence: 54%

Cyclic Deformation Behavior of A Heat-Treated Die-Cast Al-Mg-Si-Based Aluminum Alloy

Mohammed

Gupta

et al. 2020

Materials

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“…4 Microstructures from the die-cast plates sectioned longitudinally: a inlet transverse of the castings showing the gate area (enclosed by the dotted box) and the die-filling direction heads into the page, b longitudinally cross-sectional area near the gate from the solid line in a, c higher magnification of the dotted box in b and the surface layer edge is enclosed by the dotted lines, d longitudinally cross-sectional area around the line 2 in a properties of the specimens sectioned near the overflows are superior to those sectioned near the ingate. As compared to previous investigations [6,14], the slightly lower elongation in this experiment can be attributed to the relatively higher magnesium content (6.9%).…”

Section: Microstructure Segregationcontrasting

confidence: 52%

Microstructure, Mechanical Properties and Die-Filling Behavior of High-Performance Die-Cast Al–Mg–Si–Mn Alloy

Zhang

2015

Acta Metall. Sin. (Engl. Lett.)

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This work aims to reveal the relationships between the microstructure, mechanical properties and flow behavior of die-casting AlMg 5 Si 2 Mn alloy. Results indicated that the microstructure of the die-cast AlMg 5 Si 2 Mn consists of a 1-Al grains, fine-size a 2-Al grains and (Al ? Mg 2 Si) eutectic. The surface layer observed has the thickness in a range of 120-135 lm, while an ellipse-like surface layer edge is observed in the corner of the plate-like sample. Tensile strength and elongation (d) of the specimens are slightly decreased along the die-filling direction due to the backflow of melt. Pure (Al ? Mg 2 Si) eutectic layer and ultra-fine-size a 2-Al grains observed are around the overflow channels. Mass feeding is predominantly responsible for the superior mechanical properties of the round bars as compared to those of plate-like samples.

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“…In order to increase the yield strength, the micro alloying method has been applied, but the achievable yield strengths are still in the relatively low level of 180-190 MPa [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

High performance Al/TiB2 composites fabricated by nanoparticle reinforcement and cutting-edge super vacuum assisted die casting process

Dong

Youssef

Zhang

et al. 2019

Composites Part B: Engineering

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The enhancement of double strengthening by nanoparticles and nanoscale precipitates in diecast Al-Si-Mg-Mn-TiB2 composites has be achieved by introducing TiB2 nanoparticles into Al-*Si-*Mg alloy fabricated by super vacuum assisted high pressure die casting process. The composite with 3.5wt.% TiB2 nanoparticles could deliver the hardness of 1.5 GPa, the yield strength of 351 MPa and ultimate tensile strength of 410 MPa in association with an industrially applicable ductility of 5.2 %, after solution and peak ageing heat treatment. The TiB2 nanoparticles distributed at the grain boundaries rather than in the α-Al matrix of the composites in as-cast state. After solution and peak ageing, the TiB2 nanoparticles were enrolled into the α-Al matrix through the combining and coarsening of the α-Al phase during heat treatment, and nanoscale β′′ precipitates formed in the α-Al matrix. Both the TiB2 nanoparticles and the nanoscale β′′ precipitates had highly coherent interfaces with the α-Al matrix, i.e., Al(11-1)//TiB2(0001), Al[011]//TiB2[11-20], Al[320]//β''(a-axis), Al[1-30]//β''(caxis) and Al(020)//β''(b-axis), confirming strong interfacial strengthening. The double strengthening of the TiB2 nanoparticles and the nanoscale β′′ precipitates dispersing in the α-Al matrix resulted in the milestone high strength of the composites.

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Microstructure and mechanical properties of high strength die-casting Al–Mg–Si–Mn alloy

Cited by 45 publications

References 19 publications

Cyclic Deformation Behavior of A Heat-Treated Die-Cast Al-Mg-Si-Based Aluminum Alloy

Cyclic Deformation Behavior of A Heat-Treated Die-Cast Al-Mg-Si-Based Aluminum Alloy

Microstructure, Mechanical Properties and Die-Filling Behavior of High-Performance Die-Cast Al–Mg–Si–Mn Alloy

High performance Al/TiB2 composites fabricated by nanoparticle reinforcement and cutting-edge super vacuum assisted die casting process

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