Bamboo structures

Fig. 3. The bamboo structure in a metal wire after protracted heating.

Figure 10.10. Slip-band formation on the surface of a fatigued bamboo structured copper wire of 50 p,m diameter. (From G. Khatibi, A. Betzwar-Kotas, V. Groger, and B. Weiss, A Study of the Mechanical and Fatigue Properties of Metallic Microwires, Fatigue Fracture of Engineering Materials Structures, Vol. 28, No. 8, pp. 723-733, (2005). Reproduced with permission.)...

Fig. 4. Dark field electron micrograph of fibers and wide bundles (at B and C) that were anealed Ih at 383 K after drawing ( bamboo-structure ). The fibers consist of crystalline regions (bright areas) extended over the entire fiber cross section (Courtesy J. Petermann, Saarbrucken)...

Fig. 4. Typical fracture modes of Au micro-wires (a) diameter 50 M-m. as-drawn, and (b) the same wire strongly annealed (few grains per cross-section) (c) diameter 25 M-ni. as-drawn, and (d) the same wire annealed to bamboo structure. As-drawn wires show cylindrical necking fracture whereas oligocrystalline wires and wires with bamboo structure show wedge-shaped necking.

Fii . 35. Fiaclurc surfacc.s of Cii wires with bamboo structure. The thinner wire on the left (30 im) necking down to knife edge. Its surface remains smooth. Failure iificr 2.7 x Kf cycles at 180 MPa. The thicker wire on the right (95 urn) failed in a briulc manner alicr 1.3 x 10 cycles at 80 MPa. 

Figure 33.11 Bamboo structures of CNTs obtained from the pyrolysis of toluene and ferrocene in the presence of 8% diethylamine [22]. Reprinted from Reference 22a. Copyright 2010, with permission from Elsevier.

---