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

Shangshu Wu, Zongde Kou, Qingquan Lai (), Si Lan, Shyam Swaroop Katnagallu, Horst Hahn, Shabnam Taheriniya, Gerhard Wilde, Herbert Gleiter and Tao Feng ()
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Shangshu Wu: Nanjing University of Science and Technology
Zongde Kou: Nanjing University of Science and Technology
Qingquan Lai: Nanjing University of Science and Technology
Si Lan: Nanjing University of Science and Technology
Shyam Swaroop Katnagallu: Institute of Nanotechnology, Karlsruhe Institute of Technology
Horst Hahn: Nanjing University of Science and Technology
Shabnam Taheriniya: University of Münster
Gerhard Wilde: Nanjing University of Science and Technology
Herbert Gleiter: Nanjing University of Science and Technology
Tao Feng: Nanjing University of Science and Technology

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract 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.

Date: 2022
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DOI: 10.1038/s41467-022-33257-1

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