ChemInform Abstract: ON BLOW‐HOLE FORMATION DURING SOLIDIFICATION OF SILVER MELTS CONTAINING OXYGEN AND COPPER MELTS CONTAINING OXYGEN AND SULFUR

Knacke, O.; Probst, H. B.; Wernekinck, J.

doi:10.1002/chin.197916006

Cited by 14 publications

(14 citation statements)

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“…[2][3][4] The specific strength of lotus-type porous metals in the pore growth direction does not decrease because no stress concentration takes place even if the pores exist. 4) Therefore, lotus-type porous metals are considered to be effective light-weight structural materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Conditions of Unidirectional Solidification on Microstructure and Pore Morphology of Al-Mg-Si Alloys

2010

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Aluminum and Al-Mg-Si alloy ingots with pores were fabricated by unidirectional solidification through thermal decomposition of Ca(OH) 2 powders. The porosity of aluminum and Al-Mg-Si alloy were 10-17% and 0.1-2%, respectively. While the pores with 250-400 mm diameter were observed in a grain or across several grains in the aluminum ingots, smaller pores with 50-300 mm were observed in an eutectic region between primary dendrites in the Al-Mg-Si ingots. In the alloys with Mg(0.25-0.5 mass%) and Si(0.2-0.4 mass%), the unidirectional pores were aligned between columnar dendrites grown in the unidirectional solidification. With higher Mg and Si contents, the equiaxed dendrite zones with spherical pores were observed in a region with low temperature gradient. The results of thermal analysis showed that constitutional supercooling, which causes equiaxed dendrites, tends to occur with increase in Mg and Si contents and with low temperature gradient at the solid-liquid interface. Under this condition, spherical pores were evolved, because the surrounding -dendrites solidified isotropically. Therefore, it is concluded that the pore growth direction is affected by morphology of dendrites.

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Section: Introductionmentioning

confidence: 99%

Effect of Conditions of Unidirectional Solidification on Microstructure and Pore Morphology of Al-Mg-Si Alloys

2010

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“…1,2) Since the specific strength of lotus-type porous metals dose not change with the porosity when the loading direction is parallel to the poredirection, lotus-type porous metals are expected to be used for light-weight structural materials.…”

Section: Introductionmentioning

confidence: 99%

An Effect of Addition of NiO Powder on Pore Formation in Lotus-Type Porous Nickel

2008

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Lotus-type porous nickel with cylindrical pores was fabricated by unidirectional solidification in a mixture gas of hydrogen and argon. The pore size is significantly affected by the addition of NiO powder. The pore size decreases and the number density of the pores increases by the addition of NiO. It is concluded that NiO powder can serve as nucleation sites for the pore formation in the process of the solidification.

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“…[1][2][3][4][5][6][7][8][9] In particular, aluminum foams with spherical or isotropic pores, whose porosity exceeds 80%, have been studied intensively, because they exhibit superior light-weight properties originating from the intrinsic light-weight properties of aluminum matrix. [1][2][3] However, conventional aluminum foams have a disadvantage that their mechanical strength is rather low, because large stress concentration occurs in thin walls around the spherical pores under mechanical loadings.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7][8][9] Shapovalov first fabricated porous metals with directional pores from the viewpoint of applicability to functional materials. 9) Such porous metals are known as lotus-type porous metals (lotus metals) 8) or gasar metals.…”

Section: Introductionmentioning

confidence: 99%

Pore Morphology of Porous Al-Ti Alloy Fabricated by Continuous Casting in Hydrogen Atmosphere

et al. 2010

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Porous Al-5 mass%Ti alloy was fabricated by unidirectional solidification in hydrogen atmosphere, using a continuous casting technique. The porous Al-Ti alloy was prepared at different transfer (solidification) velocities, and the effect of transfer velocity on the pore morphology was investigated. It was found that the pore shape changes with increasing transfer velocity, while the porosity does not change with increasing transfer velocity. In the case of a low transfer velocity (0.5 mmÁmin À1 ), elongated pores surrounded by the columnar microstructure are formed, which indicates that the pores grow along the solidification direction together with the solid phase. In the case of a middle transfer velocity (5.0 mmÁmin À1 ), elongated pores surrounded by the columnar microstructure and needle or plate-like Al 3 Ti alloys are formed. In the case of a high transfer velocity (10.0 mmÁmin À1 ), spherical pores surrounded by the equiaxed microstructure are formed, because the primary crystals formed in the solidification front prevent the growth of elongated pores. It is suggested that the pore morphology is closely related with the solidification rate.

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ChemInform Abstract: ON BLOW‐HOLE FORMATION DURING SOLIDIFICATION OF SILVER MELTS CONTAINING OXYGEN AND COPPER MELTS CONTAINING OXYGEN AND SULFUR

Abstract: Die Blasenbildung in den Titelsystemen während linear gerichteter Erstarrung unter Normaldruck sowie zusätzlichen Inertgasdrücken bis zu 5 bar wird mit Hilfe einer modifizierten Bridgman‐Methode untersucht.

Cited by 14 publications

References 0 publications

Effect of Conditions of Unidirectional Solidification on Microstructure and Pore Morphology of Al-Mg-Si Alloys

Effect of Conditions of Unidirectional Solidification on Microstructure and Pore Morphology of Al-Mg-Si Alloys

An Effect of Addition of NiO Powder on Pore Formation in Lotus-Type Porous Nickel

Pore Morphology of Porous Al-Ti Alloy Fabricated by Continuous Casting in Hydrogen Atmosphere

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