Mechanical behavior of structurally gradient nickel alloy

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 treat...

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Bibliographic Details
Published in:Acta materialia 2018-05, Vol.149 (C), p.57-67
Main Authors: Ding, Jie, Li, Q., Li, Jin, Xue, S., Fan, Z., Wang, H., Zhang, X.
Format: Article
Language:English
Subjects:
Gradient structure
In situ compression
Nickel-based alloy
Surface mechanical grinding treatment
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Summary: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. [Display omitted]
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2018.02.021