Precipitation kinetics and mechanical properties of nanostructured steels with Mo additions

S. S. Xu, Y. W. Liu, Y. Zhang, J. H. Luan, J. P. Li, L. X. Sun, Z. B. Jiao, Z. W. Zhang, C. T. Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

Abstract

It is known that nanoscale precipitates strongly affect the precipitation hardening of structural materials. In this study, we report the precipitation kinetics and thermostability of Cu-rich and NiAl nanoprecipitates in nanostructured steels with Mo additions. Atom probe tomography and first-principles calculations revealed that the addition of Mo effectively decreased the diffusion coefficients of Cu, Ni and Al atoms, leading to the change in the precipitation mechanisms from NiAl prior-precipitation with an instantaneous-nucleation mechanism to the Cu prior-precipitation with a continuous-nucleation mechanism. The decreased diffusion coefficient significantly improves the thermostability of nanoprecipitates and strongly enhances the strength of the nanostructured steels.

Original languageEnglish
Pages (from-to)187-194
Number of pages8
JournalMaterials Research Letters
Volume8
Issue number5
DOIs
Publication statusPublished - 3 May 2020

Keywords

  • Mo additions
  • Nanoprecipitates
  • nanostructured steels
  • precipitation mechanisms
  • thermostability

ASJC Scopus subject areas

  • Materials Science(all)

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