About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Symposium
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2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
Mechanism and Prediction of Hydrogen Embrittlement in fcc Stainless Steels and High Entropy Alloys |
Author(s) |
Xiao Zhou, Ali Tehranchi, William A Curtin |
On-Site Speaker (Planned) |
William A Curtin |
Abstract Scope |
Recent experiments on new fcc high entropy alloys (HEAs) seem to exhibit unique response to Hydrogen Embrittlement (HE): some HEAs absorb more hydrogen than pure Ni and conventional stainless steels but are less susceptible to HE. The possible uniqueness of HEAs with respect to HE, if true, poses a huge opportunity. Here we present a new mechanism of embrittlement based on an intrinsic ductile to brittle transition caused by H. Using first principles inputs plus statistical and applied mechanics, we predict critical H concentrations for HE across stainless steels and HEAs in very good agreement with experiments. In particular, the HE resistance ranked as CoNiV>SS316L>NiCoCr>CoCrFeNi>CoCrFeMnNi>SS304>Ni is understood in terms of the effects of H on different alloy properties. While HEAs are not unique, complex alloys can be beneficial for HE and the theory opens an avenue toward design of HEA with good resistance to HE. |
Proceedings Inclusion? |
Undecided |