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Different lattice distortion effects on the tensile properties of Ni-W dilute solutions and CrFeNi and CoCrFeMnNi concentrated solutions
- Source :
- Acta Materialia. 221:117399
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- The lattice distortion of a solute primarily occurs because its atomic size and chemical bonding are different from those of neighboring atoms. The lattice distortion effects in conventional and high-entropy alloys are different; however, a detailed investigation on these effects has yet to be conducted. To fill this research gap, this study produced face-centered cubic-structured dilute solutions (Ni, Ni–2 at.% W, and Ni–4 at.% W) and concentrated solutions (equiatomic CrFeNi and CoCrFeMnNi) and compared their tensile properties. For the two W-containing alloys, lattice distortion occurred only around the large and strong W atoms. However, for the two concentrated solutions, which had a similar interelement atomic size and shear modulus to the aforementioned alloys, lattice distortion occurred at all lattice sites. These two types of lattice distortion had significantly different effects on tensile properties. The strength and ductility of the alloys with a high concentration of distorted lattice points were higher than those of the alloys with a low concentration of distorted lattice points, although the alloys with a low concentration of distorted lattice points had a larger nominal atomic size difference and shear modulus difference. The mechanisms underlying the evolution of different mechanical properties under different types of lattice distortion were examined for the dilute and concentrated alloys. Moreover, the universal solid solution strengthening mechanism was observed.
- Subjects :
- Materials science
Polymers and Plastics
Condensed matter physics
Metals and Alloys
Lattice distortion
Lattice (group)
Thermodynamics
Electronic, Optical and Magnetic Materials
Shear modulus
Condensed Matter::Materials Science
Solid solution strengthening
Atomic radius
Chemical bond
Peierls stress
Ultimate tensile strength
Ceramics and Composites
Ductility
Solid solution
Subjects
Details
- ISSN :
- 13596454
- Volume :
- 221
- Database :
- OpenAIRE
- Journal :
- Acta Materialia
- Accession number :
- edsair.doi.dedup.....33f8e100a8ffcce780cec8fee5c6a5a0