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Title: Elevated temperature microstructure evolution of a medium-entropy CrCoNi superalloy containing Al,Ti

Abstract

A new medium-entropy superalloy was produced based on the compositions of equiatomic CrCoNi and Ni-base superalloy Inconel 740H. Initial alloy design was performed using Thermo-Calc. The aging response and microstructural stability were assessed following heat treatment at temperatures between 600 and 900 °C and durations up to 100 h. Aging from a fully recrystallized state resulted in negligible grain growth and produced γ’ and σ phases. The same phases were present after aging from a cold-rolled state, but partially recrystallized microstructures resulted in multi-modal size distributions and heterogeneous spatial arrangements. Finally, room temperature hardness measurements were used to correlate aging conditions with quantitative precipitate measurements and mechanical properties.

Authors:
 [1]; ORCiD logo [2];  [3]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  3. Ohio State Univ., Columbus, OH (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1607024
Grant/Contract Number:  
AC05-00OR22725; DMR-1508505; DMR-1905748; DGE-1343012
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 817; Journal Issue: C; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; medium-entropy alloy; CrCoNi; Ni-base superalloy; microstructural stability; phase decomposition

Citation Formats

Slone, C. E., George, Easo, and Mills, Michael J. Elevated temperature microstructure evolution of a medium-entropy CrCoNi superalloy containing Al,Ti. United States: N. p., 2019. Web. doi:10.1016/j.jallcom.2019.152777.
Slone, C. E., George, Easo, & Mills, Michael J. Elevated temperature microstructure evolution of a medium-entropy CrCoNi superalloy containing Al,Ti. United States. https://doi.org/10.1016/j.jallcom.2019.152777
Slone, C. E., George, Easo, and Mills, Michael J. Thu . "Elevated temperature microstructure evolution of a medium-entropy CrCoNi superalloy containing Al,Ti". United States. https://doi.org/10.1016/j.jallcom.2019.152777. https://www.osti.gov/servlets/purl/1607024.
@article{osti_1607024,
title = {Elevated temperature microstructure evolution of a medium-entropy CrCoNi superalloy containing Al,Ti},
author = {Slone, C. E. and George, Easo and Mills, Michael J.},
abstractNote = {A new medium-entropy superalloy was produced based on the compositions of equiatomic CrCoNi and Ni-base superalloy Inconel 740H. Initial alloy design was performed using Thermo-Calc. The aging response and microstructural stability were assessed following heat treatment at temperatures between 600 and 900 °C and durations up to 100 h. Aging from a fully recrystallized state resulted in negligible grain growth and produced γ’ and σ phases. The same phases were present after aging from a cold-rolled state, but partially recrystallized microstructures resulted in multi-modal size distributions and heterogeneous spatial arrangements. Finally, room temperature hardness measurements were used to correlate aging conditions with quantitative precipitate measurements and mechanical properties.},
doi = {10.1016/j.jallcom.2019.152777},
journal = {Journal of Alloys and Compounds},
number = C,
volume = 817,
place = {United States},
year = {2019},
month = {10}
}

Journal Article:
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Cited by: 9 works
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Figures / Tables:

Table 1 Table 1: Composition of alloy V1.

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