On the grain boundary statistics in metals and alloys susceptible to annealing twinning

Journal Article · Wed Jun 01 04:00:00 EDT 1994 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)90004-3· OSTI ID:7278249

Gertsman, V Y ^[1]; Tangri, K ^[2]; Valiev, R Z ^[3]

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1. Univ. of Manitoba, Winnipeg (Canada). Dept. of Mechanical Engineering Russian Academy of Sciences, Ufa (Russian Federation). Inst. for Metals Superplasticity Problems
2. Univ. of Manitoba, Winnipeg (Canada). Dept. of Mechanical Engineering
3. Russian Academy of Sciences, Ufa (Russian Federation). Inst. for Metals Superplasticity Problems

Grain boundary distribution which includes grain boundary character distribution (i.e. distribution of boundaries by the reciprocal density of coincidence sites [Sigma]) as well as distribution of boundaries by misorientation angles and axes is an important parameter describing polycrystalline microstructure. Numerous experimental data on grain boundary distribution in low stacking fault energy f.c.c. materials that are susceptible to annealing twinning have been analyzed and it has been established that there is a certain stable grain boundary distribution characterized by the dominance of [Sigma]3[double prime] boundaries in all statically recrystallized materials of this class. Computer modeling based on the assumption that multiple twinning is the main process controlling structure formation has confirmed this conclusion. It has been also found that distribution of lengths of different types of grain boundaries is more sensitive to the stacking fault energy and treatment of the material. Relation between grain boundary distributions and grain orientation distributions has been studied both experimentally and by computer modeling. It has been established that the grain boundary distribution is not completely determined by texture but is only influenced by it, because the grain boundary spectrum is primarily dependent on the orientation correlations which may exist between various crystallites of a polycrystal. Control of grain boundary distributions by means of various treatments has been demonstrated and possibilities of grain boundary design for improving the bulk properties of polycrystalline materials are discussed.

• OSTI ID: 7278249
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:6; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
COMPUTERIZED SIMULATION
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
DATA
ELEMENTS
EXPERIMENTAL DATA
FCC LATTICES
GRAIN BOUNDARIES
GRAIN ORIENTATION
INFORMATION
METALS
MICROSTRUCTURE
NUMERICAL DATA
ORIENTATION
POLYCRYSTALS
SIMULATION
THEORETICAL DATA