Misorientation dependence of nanometer grain boundary sliding of [011] twist boundaries in copper
- Kanazawa Univ. (Japan). Dept. of Mechanical Systems Engineering
Internal friction studies indicate that grain boundaries in copper polycrystals can slide under an applied shear stress at about 500K. The authors have found a method which allows them to examine grain boundary sliding (GBS) in copper at such low temperatures without activating crystal dislocations. That is, b.c.c. Fe-Co and fine coherent f.c.c. Fe-Co particles precipitate on boundaries and in a Cu matrix, respectively, by aging a Cu-Fe-Co alloy. The f.c.c. particles strengthen the Cu matrix. The boundary particles have the Kurdjumov-Sachs orientation relationship to one of the abutting grains; {l_brace}111{r_brace}{sub f}//{l_brace}011{r_brace}{sub b}. The moire fringes are formed on the b.c.c. particles by the interference between the 111{sub f} and 011b reflections. Using the moire fringe method, the authors have examined systematically the inherent capability of GBS for various [011] symmetric tilt boundaries and for various [011] twist boundaries below 573 K. It has been concluded that grain boundaries slide in a viscous manner with inherent viscosity.
- OSTI ID:
- 55441
- Journal Information:
- Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 8 Vol. 32; ISSN SCRMEX; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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