Deformation mechanisms of FeCoCrNiMo0.2 high entropy alloy at 77 and 15 K

Lei Tang; Biao Cai; Moataz Attallah

doi:10.1016/j.scriptamat.2019.11.026

Deformation mechanisms of FeCoCrNiMo0.2 high entropy alloy at 77 and 15 K

Lei Tang, Biao Cai, Moataz Attallah

Metallurgy and Materials

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6 Citations (Scopus)

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Abstract

Deformation mechanisms of high entropy alloys (HEAs) at cryogenic temperatures have attracted extensive research interest. We used in situ neutron diffraction to study the tensile behavior of a face-centered-cubic HEA at 77 and 15 K and compared its stacking fault energy (SFE) at ambient and cryogenic temperatures. The SFE dropped from 28 mJm^-2 at 293 K to 11 mJm^-2 at 15 K, leading to the transition of deformation mechanism from deformation-induced twinning to martensite phase transformation. As a result, excellent balance of strength and ductility was achieved at both temperatures. This finding highlights the importance
of SFE for cryogenic alloy design.

Original language	English
Pages (from-to)	166-170
Number of pages	5
Journal	Scripta Materialia
Volume	178
Early online date	19 Nov 2019
DOIs	https://doi.org/10.1016/j.scriptamat.2019.11.026
Publication status	Published - 15 Mar 2020

Keywords

high entropy alloy
cryogenic deformation
neutron diffraction

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title = "Deformation mechanisms of FeCoCrNiMo0.2 high entropy alloy at 77 and 15 K",

abstract = "Deformation mechanisms of high entropy alloys (HEAs) at cryogenic temperatures have attracted extensive research interest. We used in situ neutron diffraction to study the tensile behavior of a face-centered-cubic HEA at 77 and 15 K and compared its stacking fault energy (SFE) at ambient and cryogenic temperatures. The SFE dropped from 28 mJm-2 at 293 K to 11 mJm-2 at 15 K, leading to the transition of deformation mechanism from deformation-induced twinning to martensite phase transformation. As a result, excellent balance of strength and ductility was achieved at both temperatures. This finding highlights the importanceof SFE for cryogenic alloy design. ",

keywords = "high entropy alloy, cryogenic deformation, neutron diffraction",

author = "Lei Tang and Biao Cai and Moataz Attallah",

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doi = "10.1016/j.scriptamat.2019.11.026",

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T1 - Deformation mechanisms of FeCoCrNiMo0.2 high entropy alloy at 77 and 15 K

AU - Tang, Lei

AU - Cai, Biao

AU - Attallah, Moataz

PY - 2020/3/15

Y1 - 2020/3/15

N2 - Deformation mechanisms of high entropy alloys (HEAs) at cryogenic temperatures have attracted extensive research interest. We used in situ neutron diffraction to study the tensile behavior of a face-centered-cubic HEA at 77 and 15 K and compared its stacking fault energy (SFE) at ambient and cryogenic temperatures. The SFE dropped from 28 mJm-2 at 293 K to 11 mJm-2 at 15 K, leading to the transition of deformation mechanism from deformation-induced twinning to martensite phase transformation. As a result, excellent balance of strength and ductility was achieved at both temperatures. This finding highlights the importanceof SFE for cryogenic alloy design.

AB - Deformation mechanisms of high entropy alloys (HEAs) at cryogenic temperatures have attracted extensive research interest. We used in situ neutron diffraction to study the tensile behavior of a face-centered-cubic HEA at 77 and 15 K and compared its stacking fault energy (SFE) at ambient and cryogenic temperatures. The SFE dropped from 28 mJm-2 at 293 K to 11 mJm-2 at 15 K, leading to the transition of deformation mechanism from deformation-induced twinning to martensite phase transformation. As a result, excellent balance of strength and ductility was achieved at both temperatures. This finding highlights the importanceof SFE for cryogenic alloy design.

KW - high entropy alloy

KW - cryogenic deformation

KW - neutron diffraction

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DO - 10.1016/j.scriptamat.2019.11.026

M3 - Article

SN - 1359-6462

VL - 178

SP - 166

EP - 170

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Deformation mechanisms of FeCoCrNiMo0.2 high entropy alloy at 77 and 15 K

Abstract

Keywords

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