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Dislocation exhaustion and ultra-hardening of nanograined metals by phase transformation at grain boundaries

The development of high-strength metals has driven the endeavor of pushing the limit of grain size (d) reduction according to the Hall-Petch law. But the continuous grain refinement is particularly challenging, raising also the problem of inverse Hall-Petch effect. Here, we show that the nanograined...

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Autores principales: Wu, Shangshu, Kou, Zongde, Lai, Qingquan, Lan, Si, Katnagallu, Shyam Swaroop, Hahn, Horst, Taheriniya, Shabnam, Wilde, Gerhard, Gleiter, Herbert, Feng, Tao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9482613/
https://www.ncbi.nlm.nih.gov/pubmed/36115860
http://dx.doi.org/10.1038/s41467-022-33257-1
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author Wu, Shangshu
Kou, Zongde
Lai, Qingquan
Lan, Si
Katnagallu, Shyam Swaroop
Hahn, Horst
Taheriniya, Shabnam
Wilde, Gerhard
Gleiter, Herbert
Feng, Tao
author_facet Wu, Shangshu
Kou, Zongde
Lai, Qingquan
Lan, Si
Katnagallu, Shyam Swaroop
Hahn, Horst
Taheriniya, Shabnam
Wilde, Gerhard
Gleiter, Herbert
Feng, Tao
author_sort Wu, Shangshu
collection PubMed
description The development of high-strength metals has driven the endeavor of pushing the limit of grain size (d) reduction according to the Hall-Petch law. But the continuous grain refinement is particularly challenging, raising also the problem of inverse Hall-Petch effect. Here, we show that the nanograined metals (NMs) with d of tens of nanometers could be strengthened to the level comparable to or even beyond that of the extremely-fine NMs (d ~ 5 nm) attributing to the dislocation exhaustion. We design the Fe-Ni NM with intergranular Ni enrichment. The results show triggering of structural transformation at grain boundaries (GBs) at low temperature, which consumes lattice dislocations significantly. Therefore, the plasticity in the dislocation-exhausted NMs is suggested to be dominated by the activation of GB dislocation sources, leading to the ultra-hardening effect. This approach demonstrates a new pathway to explore NMs with desired properties by tailoring phase transformations via GB physico-chemical engineering.
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spelling pubmed-94826132022-09-19 Dislocation exhaustion and ultra-hardening of nanograined metals by phase transformation at grain boundaries Wu, Shangshu Kou, Zongde Lai, Qingquan Lan, Si Katnagallu, Shyam Swaroop Hahn, Horst Taheriniya, Shabnam Wilde, Gerhard Gleiter, Herbert Feng, Tao Nat Commun Article The development of high-strength metals has driven the endeavor of pushing the limit of grain size (d) reduction according to the Hall-Petch law. But the continuous grain refinement is particularly challenging, raising also the problem of inverse Hall-Petch effect. Here, we show that the nanograined metals (NMs) with d of tens of nanometers could be strengthened to the level comparable to or even beyond that of the extremely-fine NMs (d ~ 5 nm) attributing to the dislocation exhaustion. We design the Fe-Ni NM with intergranular Ni enrichment. The results show triggering of structural transformation at grain boundaries (GBs) at low temperature, which consumes lattice dislocations significantly. Therefore, the plasticity in the dislocation-exhausted NMs is suggested to be dominated by the activation of GB dislocation sources, leading to the ultra-hardening effect. This approach demonstrates a new pathway to explore NMs with desired properties by tailoring phase transformations via GB physico-chemical engineering. Nature Publishing Group UK 2022-09-17 /pmc/articles/PMC9482613/ /pubmed/36115860 http://dx.doi.org/10.1038/s41467-022-33257-1 Text en © The Author(s) 2022, corrected publication 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Wu, Shangshu
Kou, Zongde
Lai, Qingquan
Lan, Si
Katnagallu, Shyam Swaroop
Hahn, Horst
Taheriniya, Shabnam
Wilde, Gerhard
Gleiter, Herbert
Feng, Tao
Dislocation exhaustion and ultra-hardening of nanograined metals by phase transformation at grain boundaries
title Dislocation exhaustion and ultra-hardening of nanograined metals by phase transformation at grain boundaries
title_full Dislocation exhaustion and ultra-hardening of nanograined metals by phase transformation at grain boundaries
title_fullStr Dislocation exhaustion and ultra-hardening of nanograined metals by phase transformation at grain boundaries
title_full_unstemmed Dislocation exhaustion and ultra-hardening of nanograined metals by phase transformation at grain boundaries
title_short Dislocation exhaustion and ultra-hardening of nanograined metals by phase transformation at grain boundaries
title_sort dislocation exhaustion and ultra-hardening of nanograined metals by phase transformation at grain boundaries
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9482613/
https://www.ncbi.nlm.nih.gov/pubmed/36115860
http://dx.doi.org/10.1038/s41467-022-33257-1
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