Microstructure and mechanical properties of a new Ni–Co based superalloy at intermediate temperatures

Xiao, Zhongrun; He, Junyang; Gu, Ji; Gan, Bin; Song, Min

doi:10.1016/j.jmrt.2024.02.025

Journal of Materials Research and Technology

2024

DOI: 10.1016/j.jmrt.2024.02.025

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Microstructure and mechanical properties of a new Ni–Co based superalloy at intermediate temperatures

Zhongrun Xiao,

Junyang He,

Ji Gu

et al.

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2025

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Cited by 2 publications

References 53 publications

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As-casting structure and homogenization behavior of hundred-kilogram level GH4068 ingot prepared by electron-beam drip melting layered solidification technology

Bai,

Tan,

Yang

et al. 2025

Vacuum

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As-casting structure and homogenization behavior of hundred-kilogram level GH4068 ingot prepared by electron-beam drip melting layered solidification technology

Bai,

Tan,

Yang

et al. 2025

Vacuum

View full text Add to dashboard Cite

Evading the intermediate temperature brittleness of a precipitation-strengthened CoNiCr alloy by grain boundary engineering

Zhang,

Ding,

Gao

et al. 2025

Mater. Futures

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Intermediate temperature brittleness (ITB) in alloys, characterized by brittle fracture along grain boundaries (GBs) with less than 5% elongation to fracture at 400-900 oC, diminishes work hardening and ultimate tensile strength (UTS), therefore compromises reliability of alloys. Here, in a precipitation strengthened CoNiCr alloy, through grain boundary engineering (GBE), fiber-like γʹ or topologically close packed (TCP) phase is introduced at GBs, effectively preventing GB cracking. GBE not only alters the deformation mode from dislocation pairs to stacking faults and twins, but also transforms the failure mode from GB cracking to GB void formation, which is constrained by GB bridging phases. Consequently, our GBE approaches enhance tensile ductility from ~1% to ~10% and concurrently increase yield strength from ~650 to ~770-850 MPa at 800 oC. The strategy here offers a pathway to overcome ITB and achieve strength and ductility synergy for a wide range of metallic materials at intermediate temperatures.

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Microstructure and mechanical properties of a new Ni–Co based superalloy at intermediate temperatures

Cited by 2 publications

References 53 publications

As-casting structure and homogenization behavior of hundred-kilogram level GH4068 ingot prepared by electron-beam drip melting layered solidification technology

As-casting structure and homogenization behavior of hundred-kilogram level GH4068 ingot prepared by electron-beam drip melting layered solidification technology

Evading the intermediate temperature brittleness of a precipitation-strengthened CoNiCr alloy by grain boundary engineering

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