Electrical resistivity as a descriptor for classification of amorphous versus crystalline phases of alloys

You, Daegun; Zhang, Haitao; Ganorkar, Shraddha; Kim, Taeyeop; Schroers, Jan; Vlassak, Joost J.; Lee, Dongwoo

doi:10.1016/j.actamat.2022.117861

Cited by 22 publications

(7 citation statements)

References 89 publications

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“…When the content of EPDM is high, there are no sharp crystal diffraction peaks in both EPDM and 20LLDPE/80EPDM. There is only a dispersion peak at about 23°, suggesting an amorphous structure 27 . The characteristic diffraction peaks of the XRD curve of LLDPE are at 21.4° and 23.7°, which correspond to α(110) and α(200) crystal planes, respectively 28 .…”

Section: Resultsmentioning

confidence: 99%

“…There is only a dispersion peak at about 23 , suggesting an amorphous structure. 27 The characteristic diffraction peaks of the XRD curve of LLDPE are at 21.4 and 23.7 , which correspond to α(110) and α(200) crystal planes, respectively. 28 With the increase of EPDM content, the characteristic peaks of LLDPE gradually decrease, but no new characteristic peak appears.…”

Section: Analysis Of Crystallization Characteristics Of Lldpe/epdm Co...mentioning

confidence: 99%

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Ultraviolet light irradiated high‐efficiency crosslinking and insulating properties of LLDPE/EPDM blends

Shao,

Li,

Zhao

et al. 2023

J of Applied Polymer Sci

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Ultraviolet light (UV) irradiation crosslinked linear low‐density polyethylene (LLDPE)/ethylene propylene diene monomer (EPDM) composites with different blending ratios were prepared using benzophenone (BP) as photoinitiator and triallyl isocyanurate (TAIC) as crosslinking agent. The irradiation time was determined, the effects of rubber‐plastic ratio on the crystallization behaviors, mechanical properties, crosslinking properties and electrical properties of LLDPE/EPDM composites were investigated. The results show that with the increase of EPDM content, the crystalline structure of LLDPE/EPDM composite become looser and the crystallinity decreased. The blending of EPDM and LLDPE results in two different aggregation states of the same crystalline form. With the increase of LLDPE content, the crosslinking efficiency, tensile strength, and energy storage modulus show a significant upward trend. When two polymers simultaneously exist in the material, if the difference between the contents of two polymers is large, the breakdown strength of the composite is relatively lower. The relaxation polarization of LLDPE/EPDM at low frequencies increases with the content of EPDM, thus leading to the increase of loss factor at low frequencies. A novel UV crosslinked modified EPDM insulating material with high production efficiency and improved insulation performances has been developed for use as an insulating layer for flexible power cables.

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Section: Resultsmentioning

confidence: 99%

Section: Analysis Of Crystallization Characteristics Of Lldpe/epdm Co...mentioning

confidence: 99%

Ultraviolet light irradiated high‐efficiency crosslinking and insulating properties of LLDPE/EPDM blends

Shao,

Li,

Zhao

et al. 2023

J of Applied Polymer Sci

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“…In this process, a joint is formed without forming any molten droplets. In addition, the relatively high electric resistivity ρ e of MGs can improve the efficiency of electric power supply, [34,35] and their relatively low expansion coefficient can avoid the formation of defects such as cracks and micropores during the manufacturing process, compared with their crystalline counterparts.…”

Section: Spiderweb-mimetic Adhesion Strategymentioning

confidence: 99%

Bioinspired Interlayer Adhesion Strategy for Additive Manufacturing in Space

et al. 2023

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In-space manufacturing draws great attentions due to its potential applications in space exploration. However, the high-vacuum and microgravity environment introduces extrascientific and technical challenges. Biological experiments in the International Space Station show that spiders can build webs under microgravity conditions, which indicates that the spiderweb building could be independent of gravity. Herein, inspired by the spiderweb, a strategy for additive manufacturing in space, that is, building a 3D structure composed of metallic ribbons and bonded joints, is proposed. Several kinds of 3D metallic structures are manufactured and the flexibility and strength of the obtained jointed-ribbons are tested. It is showed in the results that the tensile strength of the 3D metallic structures reaches about 70% of that of the raw materials, while their hardness almost keeps unchanged. Herein, an effective method to realize the manufacturing of the complex metallic structures in space is provided.

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“…In order to characterize the resistivity of metal materials, the free-electron theory in metal conductors was first put forward by Paul Drude, that is, when passing through metal lattice, free electrons collide with the positive ions in the metal lattice to scatter and obey the Maxwell–Boltzmann distribution under the action of electric field formed by positive ions in the metal lattice, thus generating the resistivity; the electron scattering motion described by this model is quite different from the reality, and then after the establishment of Fermi Dirac statistical theory, according to the combination with crystal band theory, it is believed that the potential field inside the idealized complete metal crystal has complete periodicity, which means that the scattering probability of external current electrons under the action of lattice potential field energy is 0 when making a transition under the action of electric field of external power supply, so the characteristic that the resistivity is 0 due to the obstruction of external current electrons does not exist in the metal material . However, in the actual situation, the positive ions in the metal will deviate from the original lattice point due to thermal vibration at a certain temperature and trigger the deformation of the original lattice and the dissolving other elements in metal, which both cause the changes in the periodic potential field of the original crystal under ideal conditions, thus the occurrence of scattering during the passing of the above external current will form resistivity, and then Ma Xisen, a famous British mathematician, put forward the empirical model of resistivity calculation (Matthiessen Rule) for low-concentration solid solution alloys; however, in recent years, the wide application and appearance of high-concentration solid solution alloys such as superalloys, high-entropy alloys, etc., as well as the large linear deviation between the resistivity predicted by Matthiessen Rule and the actual measured results in some low-concentration solid solution alloys, have all pushed scholars to further conduct researches on electronic spectrum of dilute solid solutions. − Thereby it is found that when other elements are added into alloy matrix element, they will show the short-range order of the solid solution after their rearrangement in the solid solution stage through the interactions between atoms, thus forming a short-range order model, while at the same time, the increasing contents of solid solution elements (from dilute solid solution to high solid solution) will make this short-range order structure gradually evolve into a long-range order structure or even a complete order structure in the whole solid solution structure. Based on this, an important thought to use chemical short-range order structure of solid solution for the characterization of alloy resistivity − was first proposed by Professor Tian Shan (1985) of the University of Aeronautics and Astronautics, thus associating the microscopic cluster model of alloy solid solution with the macroscopic resistivity.…”

Section: Introductionmentioning

confidence: 99%

Conductivity of Multicomponent Alloy under Solid Solution Short-Range Order Cluster Model

et al. 2023

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The characteristic of short-range order of multicomponent alloy solid solution promotes the necessity of deeply studying and establishing the microatomic structure behind the alloy components as well as the association with the corresponding macro-physical properties, so as to guide the development of high-performance multicomponent alloys through effective composition theory design. In this research, the popular Inconel 718 nickel-base superalloy with wide application and development is taken as an example. On the one hand, on the basis of the method of “the nearest neighbor cluster plus connecting atom” qualitatively proposed by predecessors to characterize the short-range order atomic arrangement structure of multicomponent alloy solid solution due to the interaction between electrons of atoms introduced into solid solution, Friedel oscillation potential function is generated and associated with the radial density of the corresponding atomic arrangement. On the other hand, according to the construction method of the nearest neighbor cluster in alloy phase that proposes the definition of using the maximum density of atomic radial arrangement to meet the minimum principle of energy stacking, the creatively accurate expression on the spatial structure of short-range order cluster of multicomponent alloy solid solution is achieved in a quantitative manner. Furthermore, with the impact of spatial distribution content of atoms in multicomponent alloy on the external current electron scattering rate (i.e., resistivity), the accurate analysis on the conductivity of multicomponent alloy by using the short-range order cluster model of alloy solid solution is realized through the weighting idea of atomic content of each element to the resistivity (the prediction rate is within 5%).

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Electrical resistivity as a descriptor for classification of amorphous versus crystalline phases of alloys

Cited by 22 publications

References 89 publications

Ultraviolet light irradiated high‐efficiency crosslinking and insulating properties of LLDPE/EPDM blends

Ultraviolet light irradiated high‐efficiency crosslinking and insulating properties of LLDPE/EPDM blends

Bioinspired Interlayer Adhesion Strategy for Additive Manufacturing in Space

Conductivity of Multicomponent Alloy under Solid Solution Short-Range Order Cluster Model

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