The role of dislocation-solute interactions on the creep behaviour of binary Mg–RE alloys

The role of dislocation-solute interactions on the creep behaviour of binary Mg–RE alloys

Abstract The effect of dislocation-RE atoms interactions on the creep behaviour has been studied via creep testing and HAADF-STEM analysis of two extruded alloys; Mg–0.5Ce and Mg–2Gd (wt%). Almost no Ce atoms are detected in the Mg matrix due to the low solid solubility and faster diffusion rate in...

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Main Authors: Jing Li, Jialin Wu, Li Jin, Mert Celikin, Fenghua Wang, Shuai Dong, Jie Dong
Format: Article
Language:English
Published: Nature Publishing Group 2021-02-01
Series:Scientific Reports
Online Access:https://doi.org/10.1038/s41598-021-82517-5
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spelling doaj-813178d3c90e4ff7ab97c3824fbec4212021-02-07T12:33:25ZengNature Publishing GroupScientific Reports2045-23222021-02-011111810.1038/s41598-021-82517-5The role of dislocation-solute interactions on the creep behaviour of binary Mg–RE alloysJing Li0Jialin Wu1Li Jin2Mert Celikin3Fenghua Wang4Shuai Dong5Jie Dong6National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong UniversityNational Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong UniversityNational Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong UniversityI-Form Advanced Manufacturing Research Centre, School of Mechanical and Materials Engineering, University College DublinNational Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong UniversityNational Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong UniversityNational Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong UniversityAbstract The effect of dislocation-RE atoms interactions on the creep behaviour has been studied via creep testing and HAADF-STEM analysis of two extruded alloys; Mg–0.5Ce and Mg–2Gd (wt%). Almost no Ce atoms are detected in the Mg matrix due to the low solid solubility and faster diffusion rate in as-extruded condition. However, Gd solute segregations are observed along dislocations and hexagonal dislocation patterns. Such segregations can not only pin the dislocation motion and enhance the creep strengthening via dislocation patterns, but also lead to dynamic precipitation. Thus, combing with the stress exponent values, the transition of creep mechanism between Mg–0.5Ce alloys and Mg–2Gd alloys has been found and dislocation-Gd atoms interactions are determined to be the main factor for superior creep resistance of Mg–2Gd alloys.https://doi.org/10.1038/s41598-021-82517-5
collection DOAJ
language English
format Article
sources DOAJ
author Jing Li
Jialin Wu
Li Jin
Mert Celikin
Fenghua Wang
Shuai Dong
Jie Dong
spellingShingle Jing Li
Jialin Wu
Li Jin
Mert Celikin
Fenghua Wang
Shuai Dong
Jie Dong
The role of dislocation-solute interactions on the creep behaviour of binary Mg–RE alloys
Scientific Reports
author_facet Jing Li
Jialin Wu
Li Jin
Mert Celikin
Fenghua Wang
Shuai Dong
Jie Dong
author_sort Jing Li
title The role of dislocation-solute interactions on the creep behaviour of binary Mg–RE alloys
title_short The role of dislocation-solute interactions on the creep behaviour of binary Mg–RE alloys
title_full The role of dislocation-solute interactions on the creep behaviour of binary Mg–RE alloys
title_fullStr The role of dislocation-solute interactions on the creep behaviour of binary Mg–RE alloys
title_full_unstemmed The role of dislocation-solute interactions on the creep behaviour of binary Mg–RE alloys
title_sort role of dislocation-solute interactions on the creep behaviour of binary mg–re alloys
publisher Nature Publishing Group
series Scientific Reports
issn 2045-2322
publishDate 2021-02-01
description Abstract The effect of dislocation-RE atoms interactions on the creep behaviour has been studied via creep testing and HAADF-STEM analysis of two extruded alloys; Mg–0.5Ce and Mg–2Gd (wt%). Almost no Ce atoms are detected in the Mg matrix due to the low solid solubility and faster diffusion rate in as-extruded condition. However, Gd solute segregations are observed along dislocations and hexagonal dislocation patterns. Such segregations can not only pin the dislocation motion and enhance the creep strengthening via dislocation patterns, but also lead to dynamic precipitation. Thus, combing with the stress exponent values, the transition of creep mechanism between Mg–0.5Ce alloys and Mg–2Gd alloys has been found and dislocation-Gd atoms interactions are determined to be the main factor for superior creep resistance of Mg–2Gd alloys.
url https://doi.org/10.1038/s41598-021-82517-5
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