On the CSL grain boundary distributions in polycrystals. [Coincidence site lattice]

Journal Article · Fri Apr 15 04:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90554-1· OSTI ID:5188906

Pan, Yu ^[1]; Adams, B L ^[2]

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1. Yale Univ., New Haven, CT (United States). Dept. of Mechanical Engineering
2. Brigham Young Univ., Provo, UT (United States). Dept. of Manufacturing Engineering

CSL (Coincidence Site Lattice) grain boundaries are considered to be special for polycrystals. Compared to non-special, random grain boundaries, they are believed to be low-energy, and they are observed to be resistant to intergranular fracture, creep cavitation, etc. Thus the frequencies of CSL distribution are important in Grain Boundary Characteristics Design (GBCD). In a previous paper, the influence of crystallographic texture on the frequencies of CSL grain boundary distributions in polycrystals was discussed. The authors draw the conclusion that the frequency of CSL-boundaries depends upon texture, but that this frequency is weak for textures which are not sharp. However, the potential for spatial correlations between neighboring grain orientations was not considered in this earlier work, and some recent experimental measurements in real polycrystals are in contradiction with this conclusion. Recent experimental advances make it possible to determine the crystallographic characteristics of a large number of grain boundaries in a short time. This paper illustrates two examples for fcc cubic materials: Inconel 600 alloy with a weak rolling texture, and a highly fiber-textured aluminum thin film. It is demonstrated that the occurrence of CSL boundaries is very strong in the weakly textured Inconel 600 alloy, in disagreement with theoretical estimates. For the aluminum thin film, it is shown that experimental measurements and theoretical predictions are in reasonable agreement. In the next section the numerical results of theoretical and computer simulated CSL grain boundary distributions are described. Section 3 details the OIM experimental measurements. Section 4 provides a more complete discussion of the comparison between theoretical predictions and experimental measurements.

• DOE Contract Number: FG02-88ER45355
• OSTI ID: 5188906
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 30:8; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY-NI76CR15FE8
ALLOYS
ALUMINIUM
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
DATA
ELEMENTS
GRAIN BOUNDARIES
GRAIN ORIENTATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCONEL 600
INCONEL ALLOYS
INFORMATION
IRON ALLOYS
MATERIALS
METALS
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIMONIC
NUMERICAL DATA
ORIENTATION
TEXTURE
THEORETICAL DATA
TITANIU
TITANIUM ADDITIONS