An internal stress induced by node-blocked grain boundary sliding and associated backward sliding

Journal Article · Sun May 01 00:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90321-2· OSTI ID:5187886

Monzen, Ryoichi ^[1]; Mori, T ^[2]

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1. Kanazawa Univ. (Japan). Dept. of Mechanical Systems Engineering
2. Tokyo Inst. of Tech., Yokohama (Japan). Dept. of Materials Science and Engineering

In an earlier paper, the authors detected elastic distortion, caused by grain boundary sliding, which is blocked by b.c.c. Fe-Co particles on a grain boundary of Cu, examining the rotation of moire fringes. These fringes are formed by the interference between the Cu matrix 111[tau] and b.c.c. particle 011[sub b] reflections in transmission electron microscopy (TEM). That is, the particles, formed by aging a Cu-Fe-Co alloy, have the Kurdjumov-Sachs (K-S) relationship to one of the abutting grains. When a constant load is applied to a bicrystal with the particles on its boundary at 523 K, sliding occurs, and is then blocked by the boundary particles. The blocking develops an internal stress, which acts against an applied shear stress in the particle-free area of the boundary, and eventually stops the sliding. The internal stress also acts on the particles. The internal stress elastically distorts their (011)[sub b] planes, resulting in a magnified change in the direction of the moire fringes. A temperatures over about 550 K, diffusivity becomes large, and diffusion relaxes the internal stress in and around the b.c.c. particles. Using the moire fringe method, it has been shown that boundary sliding, and at the same time diffusion, on the Cu matrix-b.c.c. particle interfaces occur during 50 h loading at 623 K in a bicrystal. After loading at about 600 K for a sufficient time, therefore, the backward sliding on a boundary should occur upon unloading at 523 K, essentially owing to an internal stress, based on the node-suppressed sliding, produced by the loading. In this note, they offer experimental evidence for this by the moire fringe method.

• OSTI ID: 5187886
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 30:9; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT ALLOYS
STRESSES
COPPER ALLOYS
IRON ALLOYS
DIFFUSION
EXPERIMENTAL DATA
TERNARY ALLOY SYSTEMS
ALLOY SYSTEMS
ALLOYS
DATA
INFORMATION
NUMERICAL DATA
360103* - Metals & Alloys- Mechanical Properties