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- W4313255488 startingPage "118659" @default.
- W4313255488 abstract "A recently found precipitation hardened Cu-Hf alloy is a promising candidate for the fabrication of novel high strength and high electrical conductivity materials. However, the precipitation behavior and microstructural evolution during thermo-mechanical processing remain poorly recognized. The present paper focuses on the crystallography, thermodynamics and kinetics of precipitation process during isothermal aging and the interaction between nano-precipitates and nano-twins during liquid nitrogen temperature (LNT) rolling in Cu-Hf alloys. The isothermal aging precipitation procedure of Cu-Hf alloys was identified as supersaturated FCC-Cu → coherent Cu5Hf phase → incoherent Cu51Hf14 phase. The coherent Cu5Hf is oriented with respect to the Cu matrix: (111)Cu//(311)Cu5Hf, [0−11]Cu//[0−11]Cu5Hf. According to thermodynamic assessment and kinetic analysis, the formation of intermediate Cu5Hf phase is due to the lower accommodation energy and interfacial free energy of coherent nano-precipitates, and the change of the growth mode results in shape change in nano-precipitates. Based on molecular dynamics simulations, the significant improvement in the twinning ability of Cu-Hf alloys by the pre-existing nano-precipitates leads to the formation of plenty of nano-twin bundles during LNT-rolling. Finally, a new type of Cu-Hf based alloys with an excellent combination of high strength, high electrical conductivity, as well as high heat-resistance were fabricated by routine process." @default.
- W4313255488 created "2023-01-06" @default.
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- W4313255488 date "2023-02-01" @default.
- W4313255488 modified "2023-10-16" @default.
- W4313255488 title "Precipitation behavior and microstructural evolution during thermo-mechanical processing of precipitation hardened Cu-Hf based alloys" @default.
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- W4313255488 doi "https://doi.org/10.1016/j.actamat.2022.118659" @default.
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