A nanoscale co-precipitation approach for property enhancement of Fe-base alloys

Zhongwu Zhang, Chain Tsuan Liu, Michael K. Miller, Xun Li Wang, Yuren Wen, Takeshi Fujita, Akihiko Hirata, Mingwei Chen, Guang Chen, Bryan A. Chin

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

Abstract

Precipitate size and number density are two key factors for tailoring the mechanical behavior of nanoscale precipitate-hardened alloys. However, during thermal aging, the precipitate size and number density change, leading to either poor strength or high strength but significantly reduced ductility. Here we demonstrate, by producing nanoscale co-precipitates in composition-optimized multicomponent precipitation-hardened alloys, a unique approach to improve the stability of the alloy against thermal aging and hence the mechanical properties. Our study provides compelling experimental evidence that these nanoscale co-precipitates consist of a Cu-enriched bcc core partially encased by a B2-ordered Ni(Mn, Al) phase. This co-precipitate provides a more complex obstacle for dislocation movement due to atomic ordering together with interphases, resulting in a high yield strength alloy without sacrificing alloy ductility.

Original languageEnglish
Article number1327
JournalScientific reports
Volume3
DOIs
Publication statusPublished - 2013
Externally publishedYes

ASJC Scopus subject areas

  • General

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