Twin related silicon crystals in Al–Si alloys and their growth mechanism

Wang R., Lu W. and Hogan L.M. (1995) Twin related silicon crystals in Al–Si alloys and their growth mechanism. Materials Science and Technology (United Kingdom), 11 5: 441-449. doi:10.1179/mst.1995.11.5.441


Author Wang R.
Lu W.
Hogan L.M.
Title Twin related silicon crystals in Al–Si alloys and their growth mechanism
Journal name Materials Science and Technology (United Kingdom)   Check publisher's open access policy
ISSN 1743-2847
Publication date 1995-01-01
Sub-type Article (original research)
DOI 10.1179/mst.1995.11.5.441
Open Access Status Not yet assessed
Volume 11
Issue 5
Start page 441
End page 449
Total pages 9
Language eng
Subject 2500 Materials Science
3104 Condensed Matter Physics
2211 Mechanics of Materials
2210 Mechanical Engineering
Abstract The relationships between the morphologies and growth mechanisms of primary silicon crystals were studied using a hot etching technique to observe growth steps across polished cross-sections. The most frequent morphologies of primary silicon observed were octahedral and starlike. Octahedral crystals are most often bifurcated across a central twin plane to form spinel twins. Their faceted growth isfacilitated by dislocations emerging from the faceted surfaces which nucleate successive atomic planes that spread across the facet surface. Alternatively, accelerated corner growth (skeletal growth) can also nucleate the atomic planes. Starlike crystals usually exhibit five branches in a twin relationship, radiating from a centre. Evidence is presented that each branch can grow as afaceted octahedron, although initial growth may occur by the twin plane re-entrant edge (TPRE) mechanism. This mechanism is the accepted growth mode of a third morphology, plate like growth, which has been described previously. There is a great variety of other morphologies, mostly irregular, described in the literature. Most can be explained as either clusters of octahedral crystals or as the results of skeletal growth.Under relatively extreme conditions, skeletal growth can lead to hollow hopper crystals or pseudodendrites.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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