Study on microstructure and migration mechanism of La W cathode

Zhou, Song; Liang, Shangshang; Guo, Yinchen; Yang, Jinghui; Nie, Zuoren

doi:10.1016/j.matchar.2022.112547

Cited by 4 publications

(1 citation statement)

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“…While solute atoms can engineer nano-twinned structures, segregation can supply a pinning effect for nano twin boundaries 33 , thereby it's feasible to induce nano twins by segregation in bcc metals. Chen and Yang et al found that in bcc W electrode materials, La 2 O 3 particles, acting as a dispersion-strengthening phase, have a clear phase interface with the W matrix 34 , which was further identi ed as semi-coherent or incoherent interfacial relationship 35 , exerting a substantially positive effect on the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Synergetic strength-ductility enhancement of ultra-thin W wire by La oxide nanoprecipitates induced pinning effect

Zhang

2024

Preprint

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Ultra-thin W wire is one of the few tools that can cut precious hard materials, including wafers, silicon, and sapphire. Reducing the diameter of tungsten wire by increasing the strength of W wire is the only method to achieve lower material waste and higher precision. Here, we report an ultra-thin La-doped W wire produced by the ice bath assisted non-slip drawing, with a diameter of 38.0 μm and a continuous length exceeding 50 km, exhibiting a tensile strength up to 6.92 GPa with an elongation of 4.2%. Statistical analysis-assisted atomic resolution imaging and element distribution mapping and molecular dynamics (MD) simulations revealed that the hexagonal close-packed (hcp) La oxide precipitates pin at the grain boundaries and form a coherent interface with the body-centered cubic (bcc) W matrix, inducing the nano twins and local hcp region in bcc W matrix, which originates lattice distortion and dislocations, and altered the plastic deformation mechanism of W. The coherent W-La oxide interface enhances the plastic deformation of grain boundaries and effectively elevates the uniform deformation, thereby simultaneously enhancing the strength and ductility. The ice bath assisted non-slip drawing is applicable to diverse metal wires and is of high potential for scalable and industrial applications.

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Section: Introductionmentioning

confidence: 99%