Enhanced age hardening effects in FCC based Co1.5CrFeNi1.5 high entropy alloys with varying Ti and Al contents

Vickey Nandal; R. Sarvesha; Sudhanshu S. Singh; E. Wen Huang; Yao Jen Chang; An Chou Yeh; Jayant Jain; Suresh Neelakantan

doi:10.1016/j.mtla.2020.100823

Enhanced age hardening effects in FCC based Co_1.5CrFeNi_1.5 high entropy alloys with varying Ti and Al contents

Vickey Nandal, R. Sarvesha, Sudhanshu S. Singh, E. Wen Huang, Yao Jen Chang, An Chou Yeh, Jayant Jain^*, Suresh Neelakantan

^*Corresponding author for this work

Department of Materials Science and Engineering

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

15 Scopus citations

Abstract

The present study is an effort towards enhancing the age hardening response of FCC based non-equiatomic CoCrFeNi HEA alloys with systematic variations of Ti and Al. Upon aging a sharp increase in the hardness was observed with increasing the Ti to Al ratio. This was attributed to the enhanced precipitate number density and finer precipitate size. The results also suggested a significant variation in the precipitate morphology with changing the Ti/Al ratio. The needle-shaped, spherical and cuboidal shaped precipitates were formed in Al_0.5Co_1.5CrFeNi_1.5 (Al₀₅), Al_0.2Co_1.5CrFeNi_1.5Ti_0.3 (Al₀₂Ti₀₃) and Co_1.5CrFeNi_1.5Ti_0.5 (Ti₀₅) HEAs, respectively. A quantitative assessment of precipitate characteristics viz. precipitates size, area fraction, interparticle spacing and its correlation with strengthening have been established. It was found that Orowan model is appropriate for predicting the yield strength of Al₀₂Ti₀₃ and Ti₀₅ alloys.

Original language	English
Article number	100823
Journal	Materialia
Volume	13
DOIs	https://doi.org/10.1016/j.mtla.2020.100823
State	Published - Sep 2020

Keywords

Aging
High entropy alloys
Orowan strengthening
Precipitate morphology

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@article{8da1495459a04420a549a073d4db030d,

title = "Enhanced age hardening effects in FCC based Co1.5CrFeNi1.5 high entropy alloys with varying Ti and Al contents",

abstract = "The present study is an effort towards enhancing the age hardening response of FCC based non-equiatomic CoCrFeNi HEA alloys with systematic variations of Ti and Al. Upon aging a sharp increase in the hardness was observed with increasing the Ti to Al ratio. This was attributed to the enhanced precipitate number density and finer precipitate size. The results also suggested a significant variation in the precipitate morphology with changing the Ti/Al ratio. The needle-shaped, spherical and cuboidal shaped precipitates were formed in Al0.5Co1.5CrFeNi1.5 (Al05), Al0.2Co1.5CrFeNi1.5Ti0.3 (Al02Ti03) and Co1.5CrFeNi1.5Ti0.5 (Ti05) HEAs, respectively. A quantitative assessment of precipitate characteristics viz. precipitates size, area fraction, interparticle spacing and its correlation with strengthening have been established. It was found that Orowan model is appropriate for predicting the yield strength of Al02Ti03 and Ti05 alloys.",

keywords = "Aging, High entropy alloys, Orowan strengthening, Precipitate morphology",

author = "Vickey Nandal and R. Sarvesha and Singh, {Sudhanshu S.} and Huang, {E. Wen} and Chang, {Yao Jen} and Yeh, {An Chou} and Jayant Jain and Suresh Neelakantan",

year = "2020",

month = sep,

doi = "10.1016/j.mtla.2020.100823",

language = "English",

volume = "13",

journal = "Materialia",

issn = "2589-1529",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Enhanced age hardening effects in FCC based Co1.5CrFeNi1.5 high entropy alloys with varying Ti and Al contents

AU - Nandal, Vickey

AU - Sarvesha, R.

AU - Singh, Sudhanshu S.

AU - Huang, E. Wen

AU - Chang, Yao Jen

AU - Yeh, An Chou

AU - Jain, Jayant

AU - Neelakantan, Suresh

PY - 2020/9

Y1 - 2020/9

N2 - The present study is an effort towards enhancing the age hardening response of FCC based non-equiatomic CoCrFeNi HEA alloys with systematic variations of Ti and Al. Upon aging a sharp increase in the hardness was observed with increasing the Ti to Al ratio. This was attributed to the enhanced precipitate number density and finer precipitate size. The results also suggested a significant variation in the precipitate morphology with changing the Ti/Al ratio. The needle-shaped, spherical and cuboidal shaped precipitates were formed in Al0.5Co1.5CrFeNi1.5 (Al05), Al0.2Co1.5CrFeNi1.5Ti0.3 (Al02Ti03) and Co1.5CrFeNi1.5Ti0.5 (Ti05) HEAs, respectively. A quantitative assessment of precipitate characteristics viz. precipitates size, area fraction, interparticle spacing and its correlation with strengthening have been established. It was found that Orowan model is appropriate for predicting the yield strength of Al02Ti03 and Ti05 alloys.

AB - The present study is an effort towards enhancing the age hardening response of FCC based non-equiatomic CoCrFeNi HEA alloys with systematic variations of Ti and Al. Upon aging a sharp increase in the hardness was observed with increasing the Ti to Al ratio. This was attributed to the enhanced precipitate number density and finer precipitate size. The results also suggested a significant variation in the precipitate morphology with changing the Ti/Al ratio. The needle-shaped, spherical and cuboidal shaped precipitates were formed in Al0.5Co1.5CrFeNi1.5 (Al05), Al0.2Co1.5CrFeNi1.5Ti0.3 (Al02Ti03) and Co1.5CrFeNi1.5Ti0.5 (Ti05) HEAs, respectively. A quantitative assessment of precipitate characteristics viz. precipitates size, area fraction, interparticle spacing and its correlation with strengthening have been established. It was found that Orowan model is appropriate for predicting the yield strength of Al02Ti03 and Ti05 alloys.

KW - Aging

KW - High entropy alloys

KW - Orowan strengthening

KW - Precipitate morphology

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U2 - 10.1016/j.mtla.2020.100823

DO - 10.1016/j.mtla.2020.100823

M3 - Article

AN - SCOPUS:85088219918

SN - 2589-1529

VL - 13

JO - Materialia

JF - Materialia

M1 - 100823

ER -

Enhanced age hardening effects in FCC based Co_1.5CrFeNi_1.5 high entropy alloys with varying Ti and Al contents

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Keywords

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