Interface-facilitated stable plasticity in ultra-fine layered FeAl/FeAl2 micro-pillar at high temperature

Lulu Li; Irene J. Beyerlein; Weizhong Han

doi:10.1016/j.jmst.2020.09.018

Interface-facilitated stable plasticity in ultra-fine layered FeAl/FeAl₂ micro-pillar at high temperature

Lulu Li, Irene J. Beyerlein, Weizhong Han^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

11 Citations (Scopus)

Abstract

Fe-Al compounds possess a combination of high strength and corrosion resistance at high temperatures. However, increasing Al content to make them lighter results in embrittlement. Here, we investigate the high-temperature behavior of a novel, lightweight, ultra-fine-layered FeAl/FeAl₂ material. We report a transition from unstable to stable plasticity at 450 °C. Below 450 °C, deformation is dominated by localized shear deformation within the soft FeAl layers, while above 450 °C, it proceeds by co-deformation between FeAl and the brittle FeAl₂ layers. We show that co-deformation is associated with the temperature at which the interface converts from sliding to sourcing dislocations for FeAl₂. © 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

Original language	English
Pages (from-to)	61-65
Number of pages	5
Journal	Journal of Materials Science & Technology
Volume	73
Online published	30 Sept 2020
DOIs	https://doi.org/10.1016/j.jmst.2020.09.018
Publication status	Published - 20 May 2021
Externally published	Yes

Funding

This work was financially supported by the National Natural Science Foundation of China (Nos. 51922082, 51971170 and 51942104), the National Key Research and Development Program of China (No. 2017YFB0702301), the 111 Project of China (No. BP2018008), and the Innovation Project of Shaanxi Province (No. 2017KTPT-12).

Research Keywords

Compression
Dislocation
Fe-Al alloy
High-temperature
Interface

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10.1016/j.jmst.2020.09.018

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Cite this

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title = "Interface-facilitated stable plasticity in ultra-fine layered FeAl/FeAl2 micro-pillar at high temperature",

abstract = "Fe-Al compounds possess a combination of high strength and corrosion resistance at high temperatures. However, increasing Al content to make them lighter results in embrittlement. Here, we investigate the high-temperature behavior of a novel, lightweight, ultra-fine-layered FeAl/FeAl2 material. We report a transition from unstable to stable plasticity at 450 °C. Below 450 °C, deformation is dominated by localized shear deformation within the soft FeAl layers, while above 450 °C, it proceeds by co-deformation between FeAl and the brittle FeAl2 layers. We show that co-deformation is associated with the temperature at which the interface converts from sliding to sourcing dislocations for FeAl2. {\textcopyright} 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.",

keywords = "Compression, Dislocation, Fe-Al alloy, High-temperature, Interface",

author = "Lulu Li and Beyerlein, {Irene J.} and Weizhong Han",

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T1 - Interface-facilitated stable plasticity in ultra-fine layered FeAl/FeAl2 micro-pillar at high temperature

AU - Li, Lulu

AU - Beyerlein, Irene J.

AU - Han, Weizhong

PY - 2021/5/20

Y1 - 2021/5/20

N2 - Fe-Al compounds possess a combination of high strength and corrosion resistance at high temperatures. However, increasing Al content to make them lighter results in embrittlement. Here, we investigate the high-temperature behavior of a novel, lightweight, ultra-fine-layered FeAl/FeAl2 material. We report a transition from unstable to stable plasticity at 450 °C. Below 450 °C, deformation is dominated by localized shear deformation within the soft FeAl layers, while above 450 °C, it proceeds by co-deformation between FeAl and the brittle FeAl2 layers. We show that co-deformation is associated with the temperature at which the interface converts from sliding to sourcing dislocations for FeAl2. © 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

AB - Fe-Al compounds possess a combination of high strength and corrosion resistance at high temperatures. However, increasing Al content to make them lighter results in embrittlement. Here, we investigate the high-temperature behavior of a novel, lightweight, ultra-fine-layered FeAl/FeAl2 material. We report a transition from unstable to stable plasticity at 450 °C. Below 450 °C, deformation is dominated by localized shear deformation within the soft FeAl layers, while above 450 °C, it proceeds by co-deformation between FeAl and the brittle FeAl2 layers. We show that co-deformation is associated with the temperature at which the interface converts from sliding to sourcing dislocations for FeAl2. © 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

KW - Compression

KW - Dislocation

KW - Fe-Al alloy

KW - High-temperature

KW - Interface

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DO - 10.1016/j.jmst.2020.09.018

M3 - RGC 21 - Publication in refereed journal

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EP - 65

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