The influence of chemistry and microstructure on the fracture toughness of V-V{sub 3}Si in-situ composites
- Lawrence Livermore National Lab., CA (United States)
- General Electric Co., Schenectady, NY (United States). Corporate Research and Development Lab.
The room temperature fracture behavior is described for ductile-phase toughened V-V{sub 3}Si in-situ composites produced by arc melting (AM), cold-crucible induction melting (IM), and cold-crucible directional solidification (DS). Composites were produced containing a wide range of microstructures, interstitial impurity contents, and volume fractions of the ductile V-Si solid solution phase, denoted (V). The fracture toughness of these composites generally increases as the volume fraction of (V) increases. For a given volume fraction of (V), the fracture toughness increases with decreasing {open_quotes}effective{close_quotes} interstitial impurity content, [I]=[N]+1.3[O]+9[H]. In eutectic composites, as [I] decreases from 1400 ppm (AM) to 400 ppm (IM), the fracture toughness increases from 10 to 20 MPa {radical}m. The fracture toughness of the V-V{sub 3}Si composites is further correlated with the mechanical properties of the component phases, SEM observations of the fracture surface characteristics, and electron back-scattering pattern measurements of the fracture facet crystallography. These correlations are discussed with respect to conventional ductile phase {open_quotes}bridging{close_quotes} theories.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10183965
- Report Number(s):
- UCRL-JC--117630; CONF-9410203--1; ON: DE94018997
- Country of Publication:
- United States
- Language:
- English
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