Grain-boundary dissociation by the emission of stacking faults

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.R4241· OSTI ID:279066

Rittner, J D; Seidman, D N ^[1]; Merkle, K L ^[2]

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1. Department of Materials Science and Engineering and the Materials Research Center, R. R. McCormick School of Engineering and Applied Science, Northwestern University, Evanston, Illinois 60208 (United States)
2. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

A range of {l_angle}110{r_angle} symmetric tilt grain boundaries (GB{close_quote}s) are investigated in several fcc metals with simulations and high-resolution electron microscopy. Boundaries with tilt angles between 50.5{degree} and 109.5{degree} dissociate into two boundaries 0.6 to 1.1 nm apart. The dissociation takes place by the emission of stacking faults from one boundary that are terminated by Shockley partials at a second boundary. This is a general mode of GB relaxation for low stacking fault energy metals. The reasons for the occurrence of this relaxation mode are discussed using the theory of GB dislocations. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 279066
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 8 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
COMPUTERIZED SIMULATION
DISLOCATIONS
ELECTRON MICROSCOPY
FCC LATTICES
GOLD
GRAIN BOUNDARIES
LATTICE RELAXATION
NICKEL
STACKING FAULTS