Back to Search
Start Over
Evaluation of single crystal elastic stiffness coefficients of a nickel-based superalloy by electron backscatter diffraction and nanoindentation
- Publication Year :
- 2019
- Publisher :
- PERGAMON-ELSEVIER SCIENCE LTD, 2019.
-
Abstract
- A new methodology was developed in order to obtain single crystal elastic coefficients from nanoindentation experiments on a cubic polycrystal. The method consists of locating grains that are oriented with a 〈100〉, 〈110〉 or 〈111〉 direction near-parallel to the sample surface normal by means of electron backscattering diffraction. The reduced Young's moduli of the selected grains are then determined by nanoindentation. Finally, the average reduced modulus and Euler angles of each grain are used as input for a least-squares optimisation to calculate the three independent stiffness coefficients, which can then be used to obtain Young's modulus in any crystallographic direction. This technique, which was validated on a single crystal nickel-based superalloy (CMSX-4) with known elastic coefficients, was applied to a polycrystalline nickel-based superalloy (RR1000) with unknown elastic coefficients, resulting in a correct prediction of the general trend of increasing Young's modulus from the 〈100〉 to the 〈110〉 to the 〈111〉 direction. The stiffness coefficients C11, C12 and C44 were found to be 282, 121 and 108 GPa, respectively. These results, which are representative of the γ/γ’ structure as a whole, are in good agreement with literature data on similar superalloys. By constructing a visual representation of the elastic anisotropy based on the crystallographic factor, it is shown that the observed anisotropy is lower compared to other alloys.
- Subjects :
- Diffraction
Elastic behaviour
Technology
HARDNESS
Materials science
Materials Science
Materials Science, Multidisciplinary
02 engineering and technology
Mechanics
01 natural sciences
Nanoindentation
Nickel alloys
010305 fluids & plasmas
0103 physical sciences
Electron backscattering diffraction (EBSD)
medicine
ANISOTROPIC MATERIALS
LOAD
Anisotropy
Science & Technology
SPECTROSCOPY
Condensed matter physics
INDENTATION
Mechanical Engineering
Physics
CONSTANTS
Stiffness
MODULUS
021001 nanoscience & nanotechnology
Condensed Matter Physics
Superalloy
Physics, Condensed Matter
Mechanics of Materials
Physical Sciences
Crystallite
medicine.symptom
0210 nano-technology
Single crystal
Electron backscatter diffraction
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....5b50a5da63601ffcc1c79563ce0ef751