Growth twin crystals of aluminum and aluminum-base alloys

Watanabe, Shuichiro; Honma, Umeo; Ōya, Shigeo

doi:10.2464/jilm.19.7_279

Cited by 7 publications

(2 citation statements)

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“…[6][7][8][9][10][11] They showed that, within a feathery crystal, the microstructure after proper metallographic preparation appears as an ensemble of parallel bands exhibiting alternated colors under polarized light. [6][7][8][9][10][11] They showed that, within a feathery crystal, the microstructure after proper metallographic preparation appears as an ensemble of parallel bands exhibiting alternated colors under polarized light.…”

Section: Introductionmentioning

confidence: 99%

Electron backscattered diffraction investigation of the texture of feathery crystals in aluminum alloys

Henry

Jarry

Jouneau³

et al. 1997

Metall Mater Trans A

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Scanning electron microscopy (SEM), metallographic observations, and automated electron backscattered diffraction (EBSD) experiments were carried out on ''feathery crystals'' of a unidirectionally solidified (1D) Al-Cu alloy and of a direct-chill (DC) cast Al-Mg-Si alloy. The results clearly show that the ''feathery grains'' are made of twinned lamellae, which are parallel to a (111) twin plane. The contrast seen in the metallographic sections after a Barker etching or observed in an SEM is perfectly corroborated with the EBSD reconstructed microstructure. The lamellae are separated by an alternance of straight and wavy lines. Some equiaxed grains are also observed occasionally in the specimens. From the ͗111͘ pole figures of the various grains, it is concluded that the thermal gradient direction is close to, but not necessarily within, the (111) twin plane: its direction is in between a [01 ] and a [ 2] direction. Within a given feathery grain, small variations of the crystallographic 1 1 1 orientations (subgrain boundaries) are observed. The lamellae of one grain can sometimes penetrate into another one. Based upon this information, the mechanism of feathery grain growth previously proposed by Eady and Hogan is ruled out. Although no other growth mechanism is proposed yet, it is believed that feathery grains are the result of a competition similar to that occurring in normal dendritic alloys, but with twinned dendrites.

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Section: Introductionmentioning

confidence: 99%

Electron backscattered diffraction investigation of the texture of feathery crystals in aluminum alloys

Henry

Jarry

Jouneau³

et al. 1997

Metall Mater Trans A

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“…18) This sample had been heated at 908 K, so that it was natural that aluminum obtained thermal stress and feather crystals. Therefore, it reveals that the left section was aluminum.…”

Section: Resultsmentioning

confidence: 99%

A novel method for joining aluminum foil and alumina by polysiloxane coating

Kita

Kondo

2017

J. Ceram. Soc. Japan

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This paper describes the joining of aluminum and alumina by using polymethylphenylsiloxane, which is a type of polysiloxane. The polymethylphenylsiloxane that was coated on alumina formed an interlayer through a heat reaction involving aluminum, alumina, and polymethylphenylsiloxane. Scanning electronic microscopy and transmission electronic microscopy showed that the alumina and aluminum were joined together through the interlayer without any cracks or exfoliation, and the thickness of the interlayer was approximately 100 nm. The interlayer formed at temperatures of 873 K and higher. The X-ray diffraction pattern and energy dispersive X-ray spectroscopy suggested that the interlayer consisted of aluminum silicate. The average bending strength of the joined samples was 232 MPa. Although the strength of the samples decreased during a thermal cycling test under conditions of alternating exposure to heating at 423 K and cooling at 233 K, the strength maintained a value of at least 160 MPa, despite the number of thermal cycles exceeding 100 times.

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Heterogeneous nucleation model of twinned crystal growth from the melt

Katô

Cahoon

1985

Metall Trans A

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Growth twin crystals of aluminum and aluminum-base alloys

Cited by 7 publications

References 0 publications

Electron backscattered diffraction investigation of the texture of feathery crystals in aluminum alloys

Electron backscattered diffraction investigation of the texture of feathery crystals in aluminum alloys

A novel method for joining aluminum foil and alumina by polysiloxane coating

Heterogeneous nucleation model of twinned crystal growth from the melt

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