Journal
ACTA MATERIALIA
Volume 149, Issue -, Pages 57-67Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2018.02.021
Keywords
Nickel-based alloy; Surface mechanical grinding treatment; Gradient structure; In situ compression
Funding
- Petroleum Research Funds [PRF 53741-ND10]
- DOE-Nuclear Energy [DE-NE0008549]
- ONR Office of Naval Research [N00014-1-16-2778]
- Department of Energy OBES [DE-SC0016337]
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Certain structurally gradient metallic materials have shown a combination of high strength and work hardening capability. The fundamental mechanisms behind such a unique mechanical behavior remain less well understood. Here we processed NiCrMo based C-22HS alloys by surface mechanical grinding treatment to achieve a gradient microstructure consisting of surface nanolaminated layer, deformation twinned layer and severely deformed layers. In situ micropillar compression tests performed inside a scanning electron microscope reveal different mechanical behaviors of each layer. This study suggests that the increase of intergranular back stress may have contributed to the high strain hardening behavior of the gradient material. Published by Elsevier Ltd on behalf of Acta Materialia Inc.
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