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

Gao, Y. H.; Yang, C.; Zhang, J. Y.; Cao, L. F.; Liu, G.; Sun, J.; Ma, E.

doi:10.1080/21663831.2018.1546773

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

Journal Article · 18 November 2018 · Materials Research Letters

DOI: https://doi.org/10.1080/21663831.2018.1546773 · OSTI ID:1609477

Gao, Y. H. ^[1]; Yang, C. ^[2]; Zhang, J. Y. ^[2]; Cao, L. F. ^[2]; Liu, G. ^[2]; Sun, J. ^[2]; Ma, E. ^[3]

Xi'an Jiaotong Univ., Shaanxi (China); DOE/OSTI
Xi'an Jiaotong Univ., Shaanxi (China)
Xi'an Jiaotong Univ., Shaanxi (China); Johns Hopkins Univ., Baltimore, MD (United States)

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.

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Research Organization:: Johns Hopkins Univ., Baltimore, MD (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-03ER46056

OSTI ID:: 1609477

Journal Information:: Materials Research Letters, Journal Name: Materials Research Letters Journal Issue: 1 Vol. 7; ISSN 2166-3831

Publisher:: Taylor and FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Stabilizing nanoprecipitates in Al-Cu alloys for creep resistance at 300°C Gao, Y. H.; Yang, C.; Zhang, J. Y. https://doi.org/10.6084/m9.figshare.7361612 The current record is supplemented by this text	text	January 2018
Stabilizing nanoprecipitates in Al-Cu alloys for creep resistance at 300°C Gao, Y. H.; Yang, C.; Zhang, J. Y. https://doi.org/10.6084/m9.figshare.7361612.v1 The current record is supplemented by this text	text	January 2018

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

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