Irradiation-induced solute trapping by preexisting nanoprecipitates in high-strength low-alloy steel

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yang Zhang
  • Liyuan Liu
  • Jihong Han
  • Jijun Yang
  • Junhua Luan
  • Zengbao Jiao
  • Zhongwu Zhang

Detail(s)

Original languageEnglish
Article number143510
Journal / PublicationMaterials Science and Engineering A
Volume849
Online published29 Jun 2022
Publication statusPublished - 1 Aug 2022

Abstract

In the present study, a nanoprecipitate-strengthened high-strength low-alloy steel was irradiated by high-energy Au2+ ions with a peak dose of ∼70 displacements per atom (dpa) at room temperature. The formation of nanoprecipitates, dislocation loops, elemental segregation and mechanical properties before and after irradiation were carefully characterized using atom probe tomography (APT), transmission electron microscopy (TEM) and nanoindentation. The mechanism of precipitation and coarsening of these nanoprecipitates and the effect of the dose on irradiation-induced solute capture were studied. The results show that, different from a simple aging-induced precipitation of Cu-rich nanoprecipitates, coprecipitation of Cu/Ni nanoprecipitates occurred under irradiation. With increasing dose, the nanoprecipitates coarsened. Although irradiation induced the formation of small dislocation loops together with new nanoprecipitates, the abnormal softening that occurred after irradiation can be attributed to the coarsening of the preexisting nanoprecipitates. These studies and discoveries are expected to provide unique and important information for the design of new structural alloys with enhanced radiation resistances.

Research Area(s)

  • High-dose ion irradiation, High-strength low-alloy steel, Irradiation softening, Preexisting nanoprecipitates, Radiation-induced precipitation

Citation Format(s)

Irradiation-induced solute trapping by preexisting nanoprecipitates in high-strength low-alloy steel. / Zhang, Yang; Liu, Liyuan; Han, Jihong et al.
In: Materials Science and Engineering A, Vol. 849, 143510, 01.08.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review