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Title: Stabilizing nanoprecipitates in Al-Cu alloys for creep resistance at 300°C

Abstract

Commercial precipitation-hardened Al-Cu alloys are normally used at temperatures below its ageing temperature of ~225°C, to avoid thermally induced precipitate coarsening and resultant softening. Making such popular Al alloys creep resistant at or above 300°C is thus challenging. Here we present a modified precipitation protocol, exploiting Sc-microalloying and a carefully designed three-step heat treatment to enhance Sc segregation at the matrix/θ'-Al2Cu precipitate interfaces. The stabilized nanoprecipitates enable an order-of-magnitude reduction in creep rate at 300°C, demonstrating the room for microstructure improvement and the potential for property elevation in traditional engineering alloys through innovative processing coupled with synergetic alloying elements.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Xi'an Jiaotong Univ., Shaanxi (China)
  2. Xi'an Jiaotong Univ., Shaanxi (China); Johns Hopkins Univ., Baltimore, MD (United States)
Publication Date:
Research Org.:
Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1609477
Grant/Contract Number:  
FG02-03ER46056
Resource Type:
Accepted Manuscript
Journal Name:
Materials Research Letters
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2166-3831
Publisher:
Taylor and Francis
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Materials Science; Al alloys; microalloying; interfacial segregation; precipitates; creep resistance

Citation Formats

Gao, Y. H., Yang, C., Zhang, J. Y., Cao, L. F., Liu, G., Sun, J., and Ma, E.. Stabilizing nanoprecipitates in Al-Cu alloys for creep resistance at 300°C. United States: N. p., 2018. Web. https://doi.org/10.1080/21663831.2018.1546773.
Gao, Y. H., Yang, C., Zhang, J. Y., Cao, L. F., Liu, G., Sun, J., & Ma, E.. Stabilizing nanoprecipitates in Al-Cu alloys for creep resistance at 300°C. United States. https://doi.org/10.1080/21663831.2018.1546773
Gao, Y. H., Yang, C., Zhang, J. Y., Cao, L. F., Liu, G., Sun, J., and Ma, E.. Mon . "Stabilizing nanoprecipitates in Al-Cu alloys for creep resistance at 300°C". United States. https://doi.org/10.1080/21663831.2018.1546773. https://www.osti.gov/servlets/purl/1609477.
@article{osti_1609477,
title = {Stabilizing nanoprecipitates in Al-Cu alloys for creep resistance at 300°C},
author = {Gao, Y. H. and Yang, C. and Zhang, J. Y. and Cao, L. F. and Liu, G. and Sun, J. and Ma, E.},
abstractNote = {Commercial precipitation-hardened Al-Cu alloys are normally used at temperatures below its ageing temperature of ~225°C, to avoid thermally induced precipitate coarsening and resultant softening. Making such popular Al alloys creep resistant at or above 300°C is thus challenging. Here we present a modified precipitation protocol, exploiting Sc-microalloying and a carefully designed three-step heat treatment to enhance Sc segregation at the matrix/θ'-Al2Cu precipitate interfaces. The stabilized nanoprecipitates enable an order-of-magnitude reduction in creep rate at 300°C, demonstrating the room for microstructure improvement and the potential for property elevation in traditional engineering alloys through innovative processing coupled with synergetic alloying elements.},
doi = {10.1080/21663831.2018.1546773},
journal = {Materials Research Letters},
number = 1,
volume = 7,
place = {United States},
year = {2018},
month = {11}
}

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Cited by: 23 works
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