On the formation of {l_angle}010{r_angle}-dislocations in the {gamma}{prime}-phase of superalloy single crystals during high temperature low stress creep
- Ruhr-Univ. Bochum (Germany). Inst. fuer Werkstoffe-Werkstoffwissenschaft
- Academy of Sciences, Brno (Czech Republic). Inst. of Physics and Materials
The cutting of {gamma}{prime}-particles by dislocations during shear creep deformation of CMSX 6 superalloy single crystals loaded on the macroscopic crystallographic shear system {l_angle}110{r_angle}{l_brace}111{r_brace} at T = 1,025 C and {tau} = 85 MPa is analyzed using transmission electron microscopy (TEM). The formation of a {l_angle}010{r_angle}-dislocation in the {gamma}{prime}-phase was observed and investigated by means of stereo microscopy, line trace and g{center_dot}b-analysis. Two {gamma}-matrix channel dislocations with different Burgers vectors (b) of type a{sub 0}/2<110> jointly shear the {gamma}{prime}-particle where they form a superdislocation with a total Burgers vector of a{sub 0}{l_angle}010{r_angle}. The present paper provides microstructural evidence for this high temperature cutting process. The results are discussed in relation to the evolution of the dislocation structure in the {gamma}-channels during primary creep. Peach-Koehler forces were calculated to explain the formation of the {l_angle}010{r_angle}-dislocation.
- Sponsoring Organization:
- Deutsche Forschungsgemeinschaft, Bonn (Germany); Government of the Czech Republic (Czech Republic)
- OSTI ID:
- 554121
- Journal Information:
- Acta Materialia, Vol. 45, Issue 10; Other Information: PBD: Oct 1997
- Country of Publication:
- United States
- Language:
- English
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