Texture development in SiC-seeded AlN

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(96)00148-6· OSTI ID:445350

Sandlin, M S; Bowman, K J ^[1]; Root, J ^[2]

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1. Purdue Univ., West Lafayette, IN (United States). School of Materials Engineering
2. AECL Research, Chalk River, Ontario (Canada). Chalk River Labs.

Polycrystalline AlN specimens containing 15 volume percent SiC seed particles were slip-cast then hot-pressed at 1,800 C. These processing steps resulted in oriented SiC platelets in a nearly random AlN matrix. Samples were then annealed for up to 18 hours at 2,150 C under nitrogen. Quantitative texture measurements of the AlN and SiC basal poles, and powder diffraction measurements were performed using neutron and X-ray diffraction. The results indicate that SiC platelets effectively seed AlN-SiC alloy textures by a coalescence and growth mechanism during annealing. Texture intensification does not occur in AlN specimens without SiC platelet additions, or in specimens containing non-oriented SiC powder. The most effective seeing was observed in specimens containing 15 volume percent SiC platelets. Optical microscopy and electron microscopy were used in conjunction with texture analysis to elucidate texture development mechanisms.

• OSTI ID: 445350
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 1 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM NITRIDES
ANNEALING
COMPOSITE MATERIALS
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
HOT PRESSING
NEUTRON DIFFRACTION
OPTICAL MICROSCOPY
SAMPLE PREPARATION
SILICON CARBIDES
SLIP CASTING
TEXTURE
X-RAY DIFFRACTION