Robert O. Ritchie
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View article: Ductility mechanisms in complex concentrated refractory alloys from atomistic fracture simulations
Ductility mechanisms in complex concentrated refractory alloys from atomistic fracture simulations Open
The striking variation in damage tolerance among refractory complex concentrated alloys is examined through the analysis of atomistic fracture simulations, contrasting behavior in elemental Nb with that in brittle NbMoTaW and ductile Nb 45…
View article: Characterization of the fatigue threshold behavior of UHMWPE
Characterization of the fatigue threshold behavior of UHMWPE Open
Ultra-high-molecular-weight-polyethylene (UHMWPE) has been the material of choice for bearings in total joint replacements (TJRs) for decades as a result of its excellent wear resistance, chemical inertness, energetic toughness, low fricti…
View article: Toughness enhancement by massive dislocation absorption at the crack front
Toughness enhancement by massive dislocation absorption at the crack front Open
Low-cost yet high-performance structural materials have been invariantly sought for modern engineering applications. However, due to the localized stress concentration induced by a high Peierls-Nabarro stress and limited dislocation mobili…
View article: Tunable energy landscape of screw dislocation cores by compositional fluctuations in bcc high-entropy alloys from first-principles calculations
Tunable energy landscape of screw dislocation cores by compositional fluctuations in bcc high-entropy alloys from first-principles calculations Open
The energy landscape of screw dislocation cores plays a central role in dislocation-mediated deformation mechanisms in body-centered cubic (bcc) metals. In bcc high-entropy alloys (HEAs), this energy landscape is modulated by local composi…
View article: Bending-fatigue-resistant hierarchical NiTi shape memory alloy
Bending-fatigue-resistant hierarchical NiTi shape memory alloy Open
The bending fatigue resistance of superelastic shape memory alloys (SMAs) is a key determinant for their reliable function in cyclic applications such as biomedical implants, adaptive actuators, and elastocaloric devices. However, conventi…
View article: Nature-inspired heterogeneous metamaterials: functional design framework
Nature-inspired heterogeneous metamaterials: functional design framework Open
Heterogeneous mechanical metamaterials can achieve extraordinary properties through their complex and diverse microstructural designs. However, research on the functional realization by heterogeneous mechanical metamaterials in varying sce…
View article: Tooth enamel-inspired ceramic coating on metal surface for enhanced mechanical properties and corrosion resistance
Tooth enamel-inspired ceramic coating on metal surface for enhanced mechanical properties and corrosion resistance Open
Stiffness-damping balance, high specific mechanical performance, and corrosion resistance are demanded for metals. Here, we developed an enamel-inspired ceramic (EIC) coating strategy involving hydrothermal growth of a tooth enamel-like Zr…
View article: Improved damage tolerance of SiC-based nuclear fuel cladding with novel multi-layered SiC coating design at 1200 °C
Improved damage tolerance of SiC-based nuclear fuel cladding with novel multi-layered SiC coating design at 1200 °C Open
Continuous SiC fibre reinforced SiC matrix composites (SiCf-SiCm) with monolithic SiC outer coatings are considered as a damage-tolerant cladding design for loss of coolant accident (LOCA) conditions in light water reactors. However, monol…
View article: Investigation of the temperature-dependent failure processes in PVD Cr-coated ZIRLO nuclear fuel cladding using in situ X-ray micro-tomography imaging
Investigation of the temperature-dependent failure processes in PVD Cr-coated ZIRLO nuclear fuel cladding using in situ X-ray micro-tomography imaging Open
In this work, an accident tolerant fuel cladding system with Cr coating deposited using physical vapour deposition (PVD) method onto commercial Optimized ZIRLO™ was studied. The cladding tubes were machined into C-rings and loaded to failu…
View article: Rationalization of the tensile creep behavior of the Nb45Ta25Ti15Hf15 bcc refractory complex concentrated alloy using Rao-Suzuki screw dislocation glide model
Rationalization of the tensile creep behavior of the Nb45Ta25Ti15Hf15 bcc refractory complex concentrated alloy using Rao-Suzuki screw dislocation glide model Open
Published experimental tensile creep data for refractory body-centered cubic alloy Nb45Ta25Ti15Hf15 (NTTH) at temperatures ranging from 850–950 °C and applied tensile stresses 50–300 MPa are analyzed using the Rao-Suzuki screw dislocation …
View article: Chemical trends favoring interstitial cluster formation in bcc high-entropy alloys from first-principles calculations
Chemical trends favoring interstitial cluster formation in bcc high-entropy alloys from first-principles calculations Open
Achieving high strength and ductility is a common goal in structural alloy design. Body-centered cubic high-entropy alloys (HEAs) commonly highlight the conflict between these properties, with stronger alloys being brittle and vice versa. …
View article: Fully-stretched, single-crystalline polymers of linear poly[n]catenanes
Fully-stretched, single-crystalline polymers of linear poly[n]catenanes Open
Making single crystals of fully stretched polymers is an outstanding challenge because polymers generally crystallize by chain folding. We report a strategy termed "phantom templation," wherein the metal templates the formation of poly[n]c…
View article: Nature Inspires New High‐Performance Metal Composites
Nature Inspires New High‐Performance Metal Composites Open
The intricately complex structures of natural biological materials, which endow them with exceptional properties, serve as unparalleled models and sources of inspiration for the design of synthetic materials. However, translating these str…
View article: Ductility mechanisms in complex concentrated refractory alloys from atomistic fracture simulations
Ductility mechanisms in complex concentrated refractory alloys from atomistic fracture simulations Open
The striking variation in damage tolerance among refractory complex concentrated alloys is examined through the analysis of atomistic fracture simulations, contrasting behavior in elemental Nb with that in brittle NbMoTaW and ductile Nb45T…
View article: Cryogenic 3D printing of damage tolerant hierarchical porous ceramics
Cryogenic 3D printing of damage tolerant hierarchical porous ceramics Open
Fabricating damage tolerant porous ceramics with efficient energy absorption and impact-resistant capability has been a challenge because of the brittle nature of ceramic materials. In nature, mineralized tissues or organisms such as cuttl…
View article: Reversible Nanocomposite by Programming Amorphous Polymer Conformation Under Nanoconfinement
Reversible Nanocomposite by Programming Amorphous Polymer Conformation Under Nanoconfinement Open
Nanoconfinements are utilized to program how polymers entangle and disentangle as chain clusters to engineer pseudo bonds with tunable strength, multivalency, and directionality. When amorphous polymers are grafted to nanoparticles that ar…
View article: Low driving-force stable bending cooling via fatigue-resistant hierarchical NiTi shape memory alloy
Low driving-force stable bending cooling via fatigue-resistant hierarchical NiTi shape memory alloy Open
Elastocaloric cooling with shape memory alloys (SMAs) is emerging as a promising candidate for next-generation, environmentally friendly refrigeration. However, its development is hindered by the large driving force and low efficiency asso…
View article: Mechanically robust surface-degradable implant from fiber silk composites demonstrates regenerative potential
Mechanically robust surface-degradable implant from fiber silk composites demonstrates regenerative potential Open
Through millions of years of evolution, bones have developed a complex and elegant hierarchical structure, utilizing tropocollagen and hydroxyapatite to attain an intricate balance between modulus, strength, and toughness. In this study, c…
View article: Partially recrystallized microstructures expand the strength-toughness envelope of CrCoNi medium-entropy alloy
Partially recrystallized microstructures expand the strength-toughness envelope of CrCoNi medium-entropy alloy Open
Engineering materials exhibit an undesirable tradeoff between strength and resistance to crack propagation (fracture toughness). Here we demonstrate how this tradeoff can be circumvented by thermo-mechanical processing that produces a part…
View article: On the Damage Tolerance of Bioinspired Gradient Composites with Nacre‐Like Architecture
On the Damage Tolerance of Bioinspired Gradient Composites with Nacre‐Like Architecture Open
The evolution of natural armor materials has led to gradient structures with specific architectures to achieve high damage tolerance, thus offering valuable inspiration for the design of man‐made materials. Here, bioinspired gradient compo…
View article: Engineer Reversible Nanocomposite by Programming Amorphous Polymer Conformation Under Nanoconfinement
Engineer Reversible Nanocomposite by Programming Amorphous Polymer Conformation Under Nanoconfinement Open
We utilize nanoconfinements to program how polymers entangle and disentangle as chain clusters to engineer pseudo bonds with tunable strength, multivalency, and directionality. When amorphous polymers are grafted to nanoparticles that are …
View article: Electronic descriptors for dislocation deformation behavior and intrinsic ductility in bcc high-entropy alloys
Electronic descriptors for dislocation deformation behavior and intrinsic ductility in bcc high-entropy alloys Open
Controlling the balance between strength and damage tolerance in high-entropy alloys (HEAs) is central to their application as structural materials. Materials discovery efforts for HEAs are therefore impeded by an incomplete understanding …