Defects and site occupancies in Nb-Cr-Ti C15 Laves phase alloys
Description
A multiply-faulted dipole in the C15 Laves phase of composition Nb15Cr68Ti17 has been characterized. The dislocations all lie along [011] and show no residual contrast when imaged edge-on at B = [0 bar 1 bar 1] indicating that they are edge in character. Given this, the Burgers vectors for the Shockley partials are ± 1/6[2 bar 11] and those of the stair-rods are ± 1/6[0 bar 11]. This is consistent with a g · b analysis which was performed. The stacking fault energy was determined to be 35 mJ/m2 which is higher than the experimental value of 25 mJ/m2 from NbCr2. Simulations are currently underway to understand, given the site occupancies and observed trend in stacking fault energy, whether Ti would be expected to raise the stacking fault energy of the C15 Laves phase
Availability note (English)
Available from INIS in electronic form; ALSO AVAILABLE FROM OSTI AS DE98006298; NTIS; US GOVT. PRINTING OFFICE DEP.
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Additional details
Publishing Information
- Imprint Pagination
- 9 p.
- Report number
- LA-UR--98-873
Conference
- Title
- Annual meeting of the Minerals, Metals and Materials Society (TMS)
- Dates
- 15-19 Feb 1998
- Place
- San Antonio, TX (United States)
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 30012354
- Subject category
- S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Conference, Numerical Data
- Descriptors DEI
- BURGERS VECTOR; CHROMIUM ALLOYS; CRYSTAL DEFECTS; EXPERIMENTAL DATA; INTERMETALLIC COMPOUNDS; LAVES PHASES; NIOBIUM ALLOYS; PHASE DIAGRAMS; SOLID SOLUTIONS; TITANIUM ALLOYS
- Descriptors DEC
- ALLOYS; CRYSTAL STRUCTURE; DATA; DIAGRAMS; DISPERSIONS; HOMOGENEOUS MIXTURES; INFORMATION; MIXTURES; NUMERICAL DATA; SOLUTIONS; TRANSITION ELEMENT ALLOYS
Optional Information
- Contract/Grant/Project number
- Contract W-7405-ENG-36
- Funding organization
- USDOE Office of Energy Research, Washington, DC (United States)
- Secondary number(s)
- CONF-980202--