Apparent Viscosity of Al-10mass%Cu Semi-solid Alloys.

In present study, the Al-Al 2 Cu functionally graded material (FGM) ring was fabricated from Al-3 mass%Cu initial master alloy by the centrifugal in-situ method. In the case of Al-3 mass%Cu alloy, the density of the primary -Al crystal is larger than that of the molten Al alloy. Therefore, the solid -Al phase migrates towards the outer periphery of the ring when the centrifugal force is applied in the early stage of solidification. Consequently, since the Cu concentration within the FGM ring monolithically increases towards the ring's inner position, the FGM ring, whose density increases toward inner region, can be successfully fabricated by the centrifugal in-situ method from dilute Al-Cu alloy. It is also found that the hardness increases towards the inner region of the ring within the Al-Al 2 Cu FGM ring. The hardness of the fabricated specimens at the inner region of the ring increases in a large scale by the heat treatments, since Guinier-Preston (GP) zones would be formed by aging.

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“…The following equation was reported for the apparent viscosity of Al-10 mass%Cu semi-solid alloy. 25)…”

Section: Discussionmentioning

confidence: 99%

Density and Hardness Gradients of Functionally Graded Material Ring Fabricated from Al-3 mass%Cu Alloy by a Centrifugal <I>In-Situ</I> Method

Watanabe

Sato

Ogawa³

et al. 2007

Mater. Trans.

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“…5,16) In this study, with increase in the shear rate at the gate, the mean particle diameter of the solid particles decreased while the specific surface area of the solid particles decreased because the mean particle roundness decreased. Hence, it is contemplated that the viscosity of the slurry decreased with increase in the shear rate.…”

Section: ¹1mentioning

confidence: 99%

Effects of Injection Conditions in the Semi-Solid Injection Process on the Fluidity of JIS AC4CH Aluminum Alloy

Murakami

Miwa

Kito³

et al. 2013

Mater. Trans.

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The semi-solid process is viewed as a promising manufacturing method for producing nearly net-shaped metal products with low porosity and shrinkage. However, the semi-solid slurry is inferior to liquid state in terms of fluidity; thus, the semi-solid process exhibits low formability. Therefore, improving the fluidity of the semi-solid slurry is an important issue. To address the issue, we attempted to improve the fluidity by applying shear stress on the slurry at the gate of the mold. In this study, the effect of shear rate on the fluidity of the semi-solid slurry of the AC4CH aluminum alloy was investigated. The shear rate at the gate was controlled by changing the thickness of the gate to 1.0, 2.2, 3.1 and 4.0 mm. The fluidity was evaluated by injecting through a narrow gate into a spiral cavity in terms of the length that has flowed into the cavity. The microstructures were observed by optical microscopy. The roundness and diameter of the solid particles in the specimens were measured by image analysis. According to the results, the fluidity increased with increasing gate velocity or increasing shear rate at identical injection velocities. However, both the mean roundness and diameter of the solid particles in the specimen decreased with increase in the shear rate obtained by decreasing the gate thickness. Therefore, the slurry composed of fine spherical solid particles could be obtained with a high shear rate. Additionally, both the mean particle roundness and diameter correlated with fluidity. These results suggested that the fluidity of the slurry improved with increase in the gate velocity and the shear rate because the viscosity of slurry decreased. As mentioned previously, the fluidity of semi-solid slurry could be improved by controlling the gate velocity and shear rate. It is expected that this method can enable the production of semi-solid forming products with complex configurations.

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“…It is important to note that by addition of boron in the form of A15TÍ1B or A15TÍ0.6B, the critical titanium level shifts to lower titanium level. 120,000 The role of boron in the Al-Ti-B system is less clear. As discussed above, it has been suggested that boron acts to shift the onset of peritectic reaction to the lower titanium level.…”

Section: Titanium-boron Refinementmentioning

confidence: 99%

“…Melt agitation is commonly generated by means of augers or screw [115][116][117][118], impellers or some special kind of agitators [114,[119][120][121]. Non-dendritic structures could be formed by applying shear forces exerted by stirrers during solidification.…”

Section: Mechanical Stirringmentioning

confidence: 99%

Effects of grain refining and modification on the microstructural evolution of semi-solid 356 alloy /

Nafisi¹

2006

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Semi-solid metal (SSM) processing is gaming momentum as an effective alternative to the classical manufacturing processes of casting and forging. This category takes advantages of both liquid and solid forming processes. In the absence of shear force, semi-solid slug is similar to a solid, self standing, while with the application of shear force, the viscosity is reduced appreciably and the material flows like a liquid; Thixotropic-"

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Apparent Viscosity of Al-10mass%Cu Semi-solid Alloys.

Cited by 49 publications

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Density and Hardness Gradients of Functionally Graded Material Ring Fabricated from Al-3 mass%Cu Alloy by a Centrifugal <I>In-Situ</I> Method

Density and Hardness Gradients of Functionally Graded Material Ring Fabricated from Al-3 mass%Cu Alloy by a Centrifugal <I>In-Situ</I> Method

Effects of Injection Conditions in the Semi-Solid Injection Process on the Fluidity of JIS AC4CH Aluminum Alloy

Effects of grain refining and modification on the microstructural evolution of semi-solid 356 alloy /

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