Effects of rheocasting and heat treatment on microstructure and mechanical properties of A356 alloy

BoChao, Liao; Park, Young-Koo; Ding, Hongsheng

doi:10.1016/j.msea.2010.09.059

Cited by 42 publications

(18 citation statements)

References 3 publications

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“…Since shear force could break down the dendrite arms of the α-Al phase, leading to grain refinement, its microstructure in the rheocasting condition became smaller and denser, where the rheocast sample recorded the highest microhardness, compared to the as-cast sample [12], as well as a change in the morphology of Si particles, from a flake shape in the as-cast to acicular shapes in the cooling slope, which contributed to the microhardness of A356 alloy, as mentioned in Section 3.2.…”

Section: Hardnessmentioning

confidence: 99%

“…Since the corrosion resistance and strength of alloys are mostly influenced by their microstructure [8][9][10], there are various methods to refine the microstructure of unmodified A356 alloy 2 of 15 in order to improve the corrosion resistance and mechanical properties, such as heat treatment [11][12][13] and semisolid state processing to obtain a spherical microstructure using mechanical stirring, electromagnetic stirring, and controlled nucleation methods [14][15][16]. The cooling slope casting process is also considered as another simple method of the semisolid metal casting process to produce feedstock material, with a spheroid microstructure, which bears minimal equipment and operational costs [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Evaluation and Corrosion Resistance of Semisolid Cast A356 Alloy Processed by Equal Channel Angular Pressing

Gebril

Omar

Mohamed

et al. 2019

Metals

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As-cast and semisolid casting using a cooling slope A356 alloy were processed by equal channel angular pressing (ECAP) for Si and grain refinement. The ECAP was conducted at room temperature in a mold, with a channel angle of 120°, and this resulted in a significant size reduction of grain and Si particles from 170.5 and 4.22 to 23.12 and 0.71 µm, respectively, after six passes of heat-treated cooling slope casting, using the ECAP process. The hardness increased with ECAP processing, from 61 HV, for the as-cast alloy, to 134 Hv, after six passes of heat-treated cooling slope casting. The corrosion resistance of the alloy improved, from 0.042 to 0.0012 mmy−1, after the ECAP process. In this work both the strength and corrosion resistance of the ECAPed A356 alloys were improved with the application of the cooling slope process than without (i.e., from the as-cast condition).

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Section: Hardnessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural Evaluation and Corrosion Resistance of Semisolid Cast A356 Alloy Processed by Equal Channel Angular Pressing

Gebril

Omar

Mohamed

et al. 2019

Metals

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“…Compared with the as-cast samples, the TR location had a slightly improved YS and elongation, following by TH, and finally TS which had the poorest performance. Compared to the as-cast tensile properties of an A356 alloy [33,34], the A362 alloy had a much higher YS (163-167 vs. 97-104 MPa) but a considerably lower UTS (178-205 vs. 240 MPa). This is likely attributed to the higher volume fraction of porosity in HPDC A362 samples.…”

Section: Tensile Propertiesmentioning

confidence: 85%

The Effects of Heat Treatment on the Microstructure and Tensile Properties of an HPDC Marine Transmission Gearcase

Stroh

Sediako

Hanes

et al. 2021

Metals

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The drive for continuously improving the performance and increasing the efficiencies of marine transportation has resulted in the development of a new alloy, Mercalloy A362™. This alloy was designed to lighten Mercury Marine’s lower transmission gearcase while also improving the alloy’s recyclability. The new prototype gearcase was subjected to Mercury Marine’s standard service conditions, which resulted in the premature failure of the prototype. A previous study revealed that a large accumulation of unwanted residual stress (~120 MPa) was present in the gearcase following the high pressure die casting process. Fortunately, the T5 heat treatment reduced the magnitude of stress by approximately 50%. However, the effects that the T5 heat treatment had on the microstructure and mechanical properties of the alloy were not discussed. Thus, this research article characterizes the effects that the T5 heat treatment has on the volume fraction and morphology of the intermetallics, as well as the tensile performance of the alloy. It was found that the T5 heat treatment led to only minor increases in the volume fraction of Fe-bearing intermetallics, leading to similar tensile properties in both the as-cast and T5 condition. These results suggest that the T5 heat treatment can alleviate residual stress without significantly altering the mechanical properties of the alloy. The results from the previous stress analysis and the current study were used to optimize the manufacturing process which led to the successful introduction of the gearcase into the competitive marine industry.

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“…Scandium also helps reduce solidification cracking during welding of high strength aluminium alloys [7]. There are two typical heat treatment methods used for A356: T6 (solution heat treated up to 540°C, water quenched then artificial aged up to 160°C) and T5 (only artificial aged up to 160°C) [8]. Comprehensive study on the effects of heat treatment on the mechanical properties of A356 inoculated with Sc at different weight percentages has been less reported in the literatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on gravity die-cast Sc-A356 aluminium alloy

2017

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The effects of scandium addition (0.00 wt.%, 0.2 wt.%, 0.4 wt.% and 0.6 wt.%) and T6 heat treatment on the microstructure and mechanical properties of A356 aluminium alloy have been investigated in the research reported in this paper. The Sc inoculated specimens were prepared by gravity die-casting, according to ASTM B557-06 standard. The cast samples were then subjected to heat treatment at solutionizing temperature of 540°C for 8 h followed by water quenching and artificial aging at 160°C for 6 h. The microstructure, microhardness and tensile strength of the heat-treated samples were examined with use of scanning electron microscope (SEM), optical microscope, Vicker's hardness tester, and Instron static machine respectively. Heat treatment was found to be able to effectively reduce grain size down to 16 lm (0.6 wt.% Sc), from 40 lm (original A356). The tensile strength was significantly improved, up to 338 MPa for heat treated 0.6 wt.% Sc-A356 having been achieved. The microhardness of 118 HV has been obtained for heat treated 0.6 wt.%Sc-A356.

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Effects of rheocasting and heat treatment on microstructure and mechanical properties of A356 alloy

Cited by 42 publications

References 3 publications

Microstructural Evaluation and Corrosion Resistance of Semisolid Cast A356 Alloy Processed by Equal Channel Angular Pressing

Microstructural Evaluation and Corrosion Resistance of Semisolid Cast A356 Alloy Processed by Equal Channel Angular Pressing

The Effects of Heat Treatment on the Microstructure and Tensile Properties of an HPDC Marine Transmission Gearcase

Effect of heat treatment on gravity die-cast Sc-A356 aluminium alloy

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