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Thermomechanical Processing Textures, part 3
Updated 26th Apr. 2014
A. D. Rollett 27-750
Texture, Microstructure & Anisotropy
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Objective
• Part 3 of the notes on typical textures covers solidification textures and textures in hexagonal metals and composites.
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Solidification texture:
<100> growth directions
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Melt-spun Palladium
columnar structures
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Hexagonal Metals
• Common to show the (0001) pole figure: provides most information needed.
• Easy slip on the basal plane means that compression generally aligns the basal plane normal with the compression axis.
• Tension typically aligns basal plane normals perpendicular to the axis.
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Uniaxial textures
in Ti
Compression: 25° from 0001, ~ <11-24>
compression
tension
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Zr: compression
Ti: compression
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hcp Rolling Textures; schematic
c/a > 1.633: RD split in 0001 c/a < 1.633: TD split in 0001
Kocks, Ch. 5
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hcp Rolling Textures:
exptl.
Kocks, Ch. 5
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hcp: Rolling: strain
dependence
20% 30%
55% 97%
Kocks, Ch. 5
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Al-SiC composites
• Reinforcement tends to randomize texture
Kocks, Ch. 5
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Al-SiC:
Fibers vs.
particles:
• Randomization from particles less than for fibers Kocks, Ch. 5
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Summary: part 3
• Typical textures illustrated for solidification, metal matrix composites and for deformed hexagonal metals.
• Solidification textures can be strong but are often ignored in processing histories!
• Significant alloy dependence observed in hexagonal metals.
• Composites generally have weaker textures than equivalently deformed single phase metals.