Observation of misoriented tertiary dendrite arms during controlled directional solidification in aluminum-7 wt pct silicon alloys

J. R. Van Hoose; R. N. Grugel; S. N. Tewari; L. N. Brush; R. G. Erdmann; D. R. Poirier

doi:10.1007/s11661-012-1260-z

Observation of misoriented tertiary dendrite arms during controlled directional solidification in aluminum-7 wt pct silicon alloys

J. R. Van Hoose, R. N. Grugel, S. N. Tewari, L. N. Brush, R. G. Erdmann, D. R. Poirier

Materials Science and Engineering

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6 Scopus citations

Abstract

Electron backscattered diffraction (EBSD) examination of transverse cross sections from a directionally solidified aluminum-7 wt pct silicon alloy revealed tertiary dendrite arms that appeared in place but in reality had orientations that significantly differed from their parent arm. The maximum extent of spuriously orientated arms occurred at an intermediate growth velocity and was more pronounced at subgrain boundaries that separated uniquely oriented dendritic arrays. Mechanisms for tertiary arm misorientations are discussed, and attention is called to the practical consequences of these in-situ defects.

Original language	English (US)
Pages (from-to)	4724-4731
Number of pages	8
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	43
Issue number	12
DOIs	https://doi.org/10.1007/s11661-012-1260-z
State	Published - Dec 2012

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys

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Van Hoose, J. R., Grugel, R. N., Tewari, S. N., Brush, L. N., Erdmann, R. G., & Poirier, D. R. (2012). Observation of misoriented tertiary dendrite arms during controlled directional solidification in aluminum-7 wt pct silicon alloys. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 43(12), 4724-4731. https://doi.org/10.1007/s11661-012-1260-z

Observation of misoriented tertiary dendrite arms during controlled directional solidification in aluminum-7 wt pct silicon alloys. / Van Hoose, J. R.; Grugel, R. N.; Tewari, S. N. et al.
In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 43, No. 12, 12.2012, p. 4724-4731.

Research output: Contribution to journal › Article › peer-review

Van Hoose, JR, Grugel, RN, Tewari, SN, Brush, LN, Erdmann, RG & Poirier, DR 2012, 'Observation of misoriented tertiary dendrite arms during controlled directional solidification in aluminum-7 wt pct silicon alloys', Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, vol. 43, no. 12, pp. 4724-4731. https://doi.org/10.1007/s11661-012-1260-z

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title = "Observation of misoriented tertiary dendrite arms during controlled directional solidification in aluminum-7 wt pct silicon alloys",

abstract = "Electron backscattered diffraction (EBSD) examination of transverse cross sections from a directionally solidified aluminum-7 wt pct silicon alloy revealed tertiary dendrite arms that appeared in place but in reality had orientations that significantly differed from their parent arm. The maximum extent of spuriously orientated arms occurred at an intermediate growth velocity and was more pronounced at subgrain boundaries that separated uniquely oriented dendritic arrays. Mechanisms for tertiary arm misorientations are discussed, and attention is called to the practical consequences of these in-situ defects.",

author = "{Van Hoose}, {J. R.} and Grugel, {R. N.} and Tewari, {S. N.} and Brush, {L. N.} and Erdmann, {R. G.} and Poirier, {D. R.}",

note = "Funding Information: The authors are grateful to Dr. Men G. Chu, Technical Fellow–Solidification Technology, Alcoa Technical Center, for providing the Al-7 wt pct Si as-cast feed bars. This research was supported, in part, by NASA Grant No. NNX08AN49G. The support of the Marshall Space Flight Center{\textquoteright}s Materials and Processing Laboratory is also gratefully acknowledged.",

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AU - Brush, L. N.

AU - Erdmann, R. G.

AU - Poirier, D. R.

N1 - Funding Information: The authors are grateful to Dr. Men G. Chu, Technical Fellow–Solidification Technology, Alcoa Technical Center, for providing the Al-7 wt pct Si as-cast feed bars. This research was supported, in part, by NASA Grant No. NNX08AN49G. The support of the Marshall Space Flight Center’s Materials and Processing Laboratory is also gratefully acknowledged.

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N2 - Electron backscattered diffraction (EBSD) examination of transverse cross sections from a directionally solidified aluminum-7 wt pct silicon alloy revealed tertiary dendrite arms that appeared in place but in reality had orientations that significantly differed from their parent arm. The maximum extent of spuriously orientated arms occurred at an intermediate growth velocity and was more pronounced at subgrain boundaries that separated uniquely oriented dendritic arrays. Mechanisms for tertiary arm misorientations are discussed, and attention is called to the practical consequences of these in-situ defects.

AB - Electron backscattered diffraction (EBSD) examination of transverse cross sections from a directionally solidified aluminum-7 wt pct silicon alloy revealed tertiary dendrite arms that appeared in place but in reality had orientations that significantly differed from their parent arm. The maximum extent of spuriously orientated arms occurred at an intermediate growth velocity and was more pronounced at subgrain boundaries that separated uniquely oriented dendritic arrays. Mechanisms for tertiary arm misorientations are discussed, and attention is called to the practical consequences of these in-situ defects.

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Observation of misoriented tertiary dendrite arms during controlled directional solidification in aluminum-7 wt pct silicon alloys

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