Plastic deformation of single crystals of WSi{sub 2} with the C11{sub b} structure
- Kyoto Univ. (Japan). Dept. of Materials Science and Engineering
The deformation behavior of single crystals of WSi{sub 2} has been investigated as a function of crystal orientation in the temperature range from room temperature to 1500 C in compression. Single crystals of WSi{sub 2} can be deformed only at high temperatures above 1100 C, in contrast to MoSi{sub 2} in which plastic flow is possible even at room temperature. Four slip systems, {l_brace}110{r_brace}{l_angle}111{r_angle}, {l_brace}011{r_brace}{l_angle}100{r_angle}, {l_brace}023{r_brace}{l_angle}100{r_angle} and (001){l_angle}100{r_angle}, are identified. While the former three slip systems are operative also in MoSi{sub 2}, the (001){l_angle}100{r_angle} slip is only operative in WSi{sub 2}. The (001){l_angle}100{r_angle} slip in WSi{sub 2} is the alternative to {l_brace}013{r_brace}{l_angle}331{r_angle} slip in MoSi{sub 2} since they are operative in the same orientation range. Slip on {l_brace}110{r_brace}{l_angle}331{r_angle} is hardly observed in WSi{sub 2}. The values of critical resolved shear stress (CRSS) for the commonly observed slip systems are much higher in WSi{sub 2} than in MoSi{sub 2} with the largest difference for {l_brace}110{r_brace}{l_angle}111{r_angle} slip. The higher CRSS values in WSi{sub 2} are not only due to the intrinsic difference in the deformation behavior but also due to the existence of numerous grown-in stacking faults on (001).
- OSTI ID:
- 329086
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 3 Vol. 47; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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