Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/82272
Title: Precipitation kinetics and mechanical properties of nanostructured steels with Mo additions
Authors: Xu, SS
Liu, YW
Zhang, Y
Luan, JH
Li, JP
Sun, LX
Jiao, ZB 
Zhang, ZW
Liu, CT
Issue Date: 2020
Source: Materials research letters, 3 May 2020, v. 8, no. 5, p. 187-194
Abstract: IMPACT STATEMENT The precipitation mechanisms and thermostability of nanoscale precipitates in nanostructured steels are strongly dependent on the diffusion coefficient of elements, which can be effectively tuned by alloying with Mo additions. 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.
Keywords: Nanoprecipitates
Precipitation mechanisms
Thermostability
Mo additions
Nanostructured steels
Publisher: Taylor & Francis
Journal: Materials research letters 
EISSN: 2166-3831
DOI: 10.1080/21663831.2020.1734976
Rights: © 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The following publication 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 (2020) Precipitation kinetics and mechanical properties of nanostructured steels with Mo additions, Materials Research Letters, 8:5, 187-194 is available at https://dx.doi.org/10.1080/21663831.2020.1734976
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