Abstract
In situ nanodeformation by sharp indenter tip on nanopillars of various sizes was applied on an additively manufactured Ni-based alloy containing equiaxed grains and nano-features for the first time. In situ microscopy compression results showed more homogeneous deformation of the smaller nanopillars (compression mode) than the larger ones (indentation mode) due to their length and the contact area between the nanopillar and the indenter tip established during in situ deformation tests. Finite element modeling indicated a higher average stress level in smaller nanopillars. The local mechanical response of additively manufactured 718 was similar to a wrought 718 alloy.
| Original language | English |
|---|---|
| Pages (from-to) | 57-62 |
| Number of pages | 6 |
| Journal | Scripta Materialia |
| Volume | 186 |
| DOIs | |
| State | Published - Sep 2020 |
Funding
This work was conducted at ORNL, which is managed by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the US Department of Energy (DOE). An additively manufactured sample was prepared by the Manufacturing Demonstration Facility, which was sponsored by DOE's Office of Energy Efficiency and Renewable Energy. Microscopy research conducted at ORNL's Center for Nanophase Materials Sciences (CNMS), which is a US DOE Office of Science User Facility. The FEI Talos F200X STEM was used as part of the Nuclear Science User Facilities. The authors wish to thank R. Dehoff, K.L. More, and D. Hoelzer for providing comments on the manuscript and D.W. Coffey, T.M. Lowe, T.S. Geer, M. Pearce, M. Going, and L. Lowe for their technical support.
Keywords
- Additive manufacturing
- Gamma double prime (γ′′)
- Gamma prime (γ′)
- In situ nanopillar deformation
- Ni-based superalloy
