Enhancing microstructural and mechanical characteristics of laser welded NiTi SMA/304 SS lap joints with medium and high entropy alloy fillers

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dc.contributor.authorWang, Yipeng
dc.contributor.authorZhang, Dongni
dc.contributor.authorLi, Hong
dc.contributor.authorLi, Zhuoxin
dc.contributor.authorYang, Zijia
dc.contributor.authorChen, Xin
dc.contributor.authorCong, Baoqiang
dc.date.accessioned2024-03-14T15:03:20Z
dc.date.available2024-03-14T15:03:20Z
dc.date.issued2024-01-03
dc.description.abstractThe demand for high-quality nickel-titanium (NiTi) shape memory alloy (SMA) and stainless steel (SS) welded structures has led to significant challenges in fusion welding technology, which is largely influenced by filler materials. This study explores the application of CoCrNi medium entropy alloy and CoCrNiFe high entropy alloy as filler materials for laser lap welding of NiTi SMA and 304 SS. A self-fusing joint was produced for comparison. The results demonstrate that the interface zone on the NiTi side was the weakest area regarding cracking defects in NiTi/304 SS lap joints. However, using CoCrNi and CoCrNiFe fillers effectively eliminated cracking defects by considerably suppressing the formation of brittle FeTi and Fe2Ti intermetallic compounds (IMCs). The average microhardness value of the weld zone without filler was higher than with CoCrNi and CoCrNiFe. Furthermore, the addition of CoCrNi and CoCrNiFe fillers to NiTi/304 SS lap joints resulted in a substantial increase in tensile properties, with tensile strength reaching 196 ± 39 MPa without filler, 319 ± 25 MPa with CoCrNi, and 377 ± 33 MPa with CoCrNiFe, respectively.en_UK
dc.description.sponsorshipThis work was supported by Beijing Natural Science Foundation (No. 3232005), the National Natural Science Foundation of China (No. 52074017) and China-CEEC Joint Education Project for Higher Education (No. 2021113).en_UK
dc.identifier.citationWang Y, Zhang D, Li H, et al., (2024) Enhancing microstructural and mechanical characteristics of laser welded NiTi SMA/304 SS lap joints with medium and high entropy alloy fillers. Welding in the World, Volume 68, June 2024, pp. 1389-1399en_UK
dc.identifier.eissn1878-6669
dc.identifier.issn0043-2288
dc.identifier.urihttps://doi.org/10.1007/s40194-023-01668-3
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/21000
dc.language.isoenen_UK
dc.publisherSpringeren_UK
dc.subjectNickel-titanium shape memory alloyen_UK
dc.subjectStainless steelen_UK
dc.subjectmedium entropy alloyen_UK
dc.subjecthigh entropy alloyen_UK
dc.subjectlaser weldingen_UK
dc.titleEnhancing microstructural and mechanical characteristics of laser welded NiTi SMA/304 SS lap joints with medium and high entropy alloy fillersen_UK
dc.typeArticleen_UK
dcterms.dateAccepted2023-12-14

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