Gradient nanostructuring via compositional means

Barrios, Alejandro; Nathaniel, James E.; Monti, Joseph M.; Milne, Zachary; Adams, David P.; Hattar, Khalid Mikhiel; Medlin, Douglas L.; Dingreville, Remi Philippe Michel; Boyce, Brad Lee

doi:10.1016/j.actamat.2023.118733

Cited by 9 publications

(3 citation statements)

References 55 publications

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“…However, for ultra‐thin films, the fatigue loading process is challenging due to difficulties in load alignment and actuation. [ 46 ] Instead, femtosecond laser and focused ion beam (FIB) are the two most widely used approaches to fabricating a sample for investigating the mechanical behavior in micro or nanoscale. More specifically, while the FIB is applicable for fabricating a length scale of tens‐of‐micrometer with a line width of hundreds‐of‐nanometer, the femtosecond laser is suitable for fabricating a length scale of millimeters to micrometers with a line width of few‐micrometer and minimized heat‐affected area.…”

Section: Resultsmentioning

confidence: 99%

Plane Stress Fracture Toughness Testing of Freestanding Ultra‐Thin Nanocrystalline Gold Films on Water Surface

Song,

Ma,

et al. 2024

Small Methods

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Fracture toughness, which is the resistance of a material to crack propagation, is a critical material property for ensuring the mechanical reliability of damage‐tolerant design. Recently, damage‐tolerant design is introduced to flexible electronics by adopting micro‐cracked ultra‐thin nanocrystalline (NC) gold films as stretchable electrodes in a plane stress state. However, experimental investigation of the plane stress fracture toughness of those films remains challenging due to the intrinsic fragility from their sub‐100 nm thicknesses. Here, a quantitative method for systematically evaluating the plane stress fracture toughness of freestanding ultra‐thin NC gold film on water surface platform is presented. After effectively fabricating single‐edge‐notched‐tension samples with femtosecond laser, mode I stress intensity factors are measured in the plane stress state on water surface. Moreover, investigation regarding the effect of notch length, notch sharpness, and notch tip plasticity validates this method based on linear elastic fracture mechanics theory. As a demonstration, the thickness‐dependent plane stress fracture toughness of ultra‐thin NC gold films is qualitatively unveiled. It is revealed that the thickness confinement effect on grain boundary sliding induces a transition in fracture behavior. This method is expected to further clarify the fracture‐related properties of various ultra‐thin films for next‐generation electronics.

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Section: Resultsmentioning

confidence: 99%

Plane Stress Fracture Toughness Testing of Freestanding Ultra‐Thin Nanocrystalline Gold Films on Water Surface

Song,

Ma,

et al. 2024

Small Methods

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“…The distortion indicates that a signi cant lattice strain exists near the La oxide precipitates, leading to elevated energy levels. La oxide doping stabilizes the grain boundaries by the pinning effect, thus stabilizing grain boundary segregation thermodynamically, reducing the grain boundary energy, and lessening the instability of nanocrystal metals 51 . The in-situ TEM movie of the La-doped W wire's drawing fracture process (Supplementary Movie 2) and the fracture microstructure in STEM image (Supplementary Fig.…”

Section: Nano Twins and Stacking Fault Structures In Bcc Metalsmentioning

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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“…36 Despite the growing need for understanding the intrinsic fatigue behavior of thin films, there are only a limited number of studies that successfully performed such experiments. [37][38][39][40] The difficulties stem from handling the flimsy samples without a substrate, and controlling the cyclic load with high accuracy. This study addresses the fatigue behavior of freestanding submicron Ni-Mo-W thin films before and after heat treatment at 500 °C for 24 hours.…”

Section: Introductionmentioning

confidence: 99%

Fatigue behavior of freestanding nickel–molybdenum–tungsten thin films with high-density planar faults

Park,

Choi

et al. 2024

Nanoscale

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Gradient nanostructuring via compositional means

Cited by 9 publications

References 55 publications

Plane Stress Fracture Toughness Testing of Freestanding Ultra‐Thin Nanocrystalline Gold Films on Water Surface

Plane Stress Fracture Toughness Testing of Freestanding Ultra‐Thin Nanocrystalline Gold Films on Water Surface

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

Fatigue behavior of freestanding nickel–molybdenum–tungsten thin films with high-density planar faults

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