Principle of equal-channel angular pressing for the processing of ultra-fine grained materials
- Kyushu Univ., Fukuoka (Japan). Dept. of Materials Science and Engineering
- Xian Univ. of Architecture and Technology (China). Dept. of Metallurgy
- Univ. of Southern California, Los Angeles, CA (United States)
Considerable interest has centered recently on the processing of materials with ultra-fine grain sizes, typically <100 nm. These materials may be prepared by various techniques including gas condensation and subsequent in situ consolidation under high vacuum, high energy ball milling and sliding wear. Alternatively, it has been shown that submicrometer-grained structures may be produced in a wide range of materials (e.g. pure metals, metallic alloys including superalloys, intermetallics, semiconductors) by subjecting these materials to a very high plastic strain using either equal-channel angular (ECA) pressing or torsion straining under high pressure. These latter procedures usually give grain sizes in the submicrometer range of {approximately}100--200 nm although there are reports of grain sizes as small as {approximately}50 nm. In practice, ECA pressing is an especially attractive processing method because it provides the capability of producing large bulk samples which are free from any residual porosity.
- OSTI ID:
- 276157
- Journal Information:
- Scripta Materialia, Vol. 35, Issue 2; Other Information: PBD: 15 Jul 1996
- Country of Publication:
- United States
- Language:
- English
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