Phase-specific deformation behavior of a relatively tough NiAl-Cr(Mo) lamellar composite

D. Yu; H. Bei; Y. Chen; E. P. George; K. An

doi:10.1016/j.scriptamat.2014.04.025

Phase-specific deformation behavior of a relatively tough NiAl-Cr(Mo) lamellar composite

D. Yu, H. Bei, Y. Chen, E. P. George, K. An

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

A NiAl-Cr(Mo) nanolayered composite exhibits improved room-temperature toughness in compression compared to its constituent phases, NiAl and Cr solid solution (Cr_ss). Real-time in situ neutron diffraction and post-test microstructural observations show that the Cr_ss layers with thickness of ∼400 nm can bear very high stresses and deform plastically before fracture, unlike in bulk form, where the Cr solid solution fractures in a relatively brittle fashion at significantly lower stresses, which contribute to the much higher toughness of the composite.

Original language	English
Pages (from-to)	59-62
Number of pages	4
Journal	Scripta Materialia
Volume	84-85
DOIs	https://doi.org/10.1016/j.scriptamat.2014.04.025
State	Published - Aug 2014

Funding

This work was sponsored by the U.S. Department of Energy, Office of Fossil Energy, Coal and Power R & D Turbines Program. Neutron diffraction was carried out at the Spallation Neutron Source (SNS), Oak Ridge National Laboratory, supported by the U.S. Department of Energy, Basic Energy Sciences, Scientific User Facilities Division. D.Y. also greatly thanks the China Scholarship Council for financial support during his visit to SNS, ORNL.

Keywords

Deformation behavior
In situ composites
Neutron diffraction
Toughness

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10.1016/j.scriptamat.2014.04.025

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abstract = "A NiAl-Cr(Mo) nanolayered composite exhibits improved room-temperature toughness in compression compared to its constituent phases, NiAl and Cr solid solution (Crss). Real-time in situ neutron diffraction and post-test microstructural observations show that the Crss layers with thickness of ∼400 nm can bear very high stresses and deform plastically before fracture, unlike in bulk form, where the Cr solid solution fractures in a relatively brittle fashion at significantly lower stresses, which contribute to the much higher toughness of the composite.",

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AU - George, E. P.

AU - An, K.

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AB - A NiAl-Cr(Mo) nanolayered composite exhibits improved room-temperature toughness in compression compared to its constituent phases, NiAl and Cr solid solution (Crss). Real-time in situ neutron diffraction and post-test microstructural observations show that the Crss layers with thickness of ∼400 nm can bear very high stresses and deform plastically before fracture, unlike in bulk form, where the Cr solid solution fractures in a relatively brittle fashion at significantly lower stresses, which contribute to the much higher toughness of the composite.

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KW - In situ composites

KW - Neutron diffraction

KW - Toughness

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ER -

Phase-specific deformation behavior of a relatively tough NiAl-Cr(Mo) lamellar composite

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Keywords

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