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Achieving superior property by forming fine-sized mult-principal element layer at the weld interface of stainless steel and medium entropy alloy
[Display omitted] •Medium entropy alloy/steel joint with superior properties was obtained by friction welding.•The microstructural evolution process in the course of welding was postulated.•The reasons for the significant strength enhancement were revealed. The present study revealed that a strong C...
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Published in: | Materials & design 2022-11, Vol.223, p.111255, Article 111255 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | [Display omitted]
•Medium entropy alloy/steel joint with superior properties was obtained by friction welding.•The microstructural evolution process in the course of welding was postulated.•The reasons for the significant strength enhancement were revealed.
The present study revealed that a strong CoCrNi medium entropy alloy (MEA)/stainless steel (SS) joint could be obtained by friction welding technique with the formation of a microscale interfacial layer composed of varying degrees of the multi-principal element. A significant refinement in grain size to (∼2.8 µm) compared to the base metals (16.6 µm for MEA and 12.2 µm for SS) was observed arising from the co-occurrence of continuous and discontinuous dynamic recrystallisation where grains nucleated at triple grain boundaries, twin boundaries as well as low angle grain boundaries. A relatively strong brass texture {112} 〈110〉 appeared in the layer after recrystallisation, which was attributed to the grain growth behaviour under large deformation. The formation process of the interfacial layer from mesoscale to nanoscale was then postulated. Nanoindentation test indicated that the grains in the layer showed hardness between two base metals, but the interfacial layer demonstrated much higher yield strength (632 ± 14 MPa) and tensile strength (916 ± 4 MPa) than base metals, being higher than the relevant values reported in the literature. It was further clarified that the grain boundary strengthening mechanism rather than dislocation strengthening or solid-solution strengthening was mainly responsible for the strength enhancement. |
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ISSN: | 0264-1275 1873-4197 |
DOI: | 10.1016/j.matdes.2022.111255 |