tailoring grain boundary structures and chemistry of ni

Grain Boundary in Oxide Scale During High

2017/1/11Grain boundary in oxide scale has profound influences on the deformation behaviour and tribological properties of metal alloys at high temperature. This chapter introduces some recent progress to quantify microstructure and interface quality, providing examples of possible property variations. Some fundamental issues of oxidation mechanism have been given, consisting of crystal structures of

Grain Size Effects in Polycrystalline Gold Nanoparticles

2012/7/21Introduction Grain size effects have been widely observed from polycrystalline metallic thin films composed of grains with different sizes and orientations. 1–4 The decrease of grain size not only increases grain boundary scattering, but also results in emergence of quantum confinement effects (emergence of discrete energy states). 5–8 Consequently, grain size has been a critical

US20140238678A1

Methods of tailoring ballistic characteristics of propellant burn to result in desired operational pressure pulse characteristics are also disclosed. Propellant structures and stimulation tools incorporating propellant structures may comprise composite propellant structures including two or more regions of propellant having different compositions, different grain structures, or both.

Thermoelectrics at Northwestern

These Zintl chemistry principels can be used then to understand p- and n-type doping as well as defects such as the role of Nb-vacancies in Nb 0.8+x CoSb. It also explains that interstitial Ni easily forms in (Ti,Zr)Ni 1+x Sn adding filled electronic states in the ()

Supporting information for during Chemical Vapour Deposition Growth How Graphene Crosses a Grain Boundary

Figure S1 Structures and binding energies of graphene on Ru(111), Pt(111) and Ni(111) substrates with different misorientation angles and on Cu(100) substrate. MD simulations. The simulation model is the same as that used in the DFT calculation. A

The effect of grain boundary on the local incipient plastic

2020/7/13Talaei, N. Nouri, and S. Ziaei-Rad, " Grain boundary effects on nanoindentation of Fe bicrystal using molecular dynamic," Mech. Mater. " HRTEM studies of the structures and the defects of exact and near ∑ = 11 {332} tilt grain boundaries in Ni," Interface Sci. 8

Crystal structure

Grain boundary areas contain those atoms that have been perturbed from their original lattice sites, dislocations, and impurities that have migrated to the lower energy grain boundary. Treating a grain boundary geometrically as an interface of a single crystal cut into two parts, one of which is rotated, we see that there are five variables required to define a grain boundary.

US20140238678A1

Methods of tailoring ballistic characteristics of propellant burn to result in desired operational pressure pulse characteristics are also disclosed. Propellant structures and stimulation tools incorporating propellant structures may comprise composite propellant structures including two or more regions of propellant having different compositions, different grain structures, or both.

Bulk Grain

2021/1/22Grain-boundary engineering is pivotal to fully utilize the mechanical, electrical, and thermal-transport properties of various materials. However, current methods in metallurgy rely almost exclusively on top-down approaches, making precise grain-boundary engineering, especially at

Grain boundary relaxation strengthening of nanocrystalline Ni W

Grain boundary relaxation strengthening of nanocrystalline Ni–W alloys Timothy J. Ruperta) Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139; and Department of Mechanical and Aerospace

Stability of nanocrystalline metals: The role of grain

2021/3/8One of the concepts that has emerged as a critical one for stabilizing nanocrystalline structures is grain-boundary alloying. 49,50,51,52,53,54,55,56,57 By alloying a nanocrystalline metal with a second species that favors grain-boundary segregation, it is possible to "decorate" the grain boundaries in the manner shown in Figure 1a through a Monte Carlo simulation of a hypothetical body

Tailoring graphene layer

2017/6/6However, the alignment of second graphene (G2) is broken on the same Cu grain (figure 1(h)), on which both bi-layer 0 and bi-layer 30 exist. The similar results for non-aligned bi-layer GFs grown on a different Cu grain orientation was observed, as shown in2

Crystal structure

A grain boundary is a single-phase interface, with crystals on each side of the boundary being identical except in orientation. The term crystallite boundary is sometimes, though rarely, used. Grain boundary areas contain those atoms that have been perturbed from their original lattice sites, dislocations, and impurities that have migrated to the lower energy grain boundary.

Domain Structure and Boundary in Single

2011/12/27Size, orientation, and boundary of graphene domains are the current focus of chemical vapor deposition (CVD) growth because they are closely related to graphene's physical properties. Here, we study the domain structure of single-layer graphene grown by ambient pressure CVD over heteroepitaxial Cu(111) and Cu(100) films. Low energy electron microscope measurements reveal

Tailoring grain boundary structures and chemistry of Ni

2018/6/1This grain-boundary engineering approach provides design ideas for advanced cathodes for batteries. A critical challenge for the commercialization of layer-structured nickel-rich lithium transition metal oxide cathodes for battery applications is their capacity and voltage fading, which originate from the disintegration and lattice phase transition of the cathode particles.

Bulk Grain

2021/1/22Grain-boundary engineering is pivotal to fully utilize the mechanical, electrical, and thermal-transport properties of various materials. However, current methods in metallurgy rely almost exclusively on top-down approaches, making precise grain-boundary engineering, especially at

Microstructure

2012/9/19As the grain boundary impinges on the γ΄, the grain boundary apparently cuts off γ΄. Firstly, the interface free energy between γ´ and the grain boundary increases. This results in dissolving the γ´ at the interface but due to the supersaturation of γ´ formers, such as Al and Ti, γ´ immediately re - nucleates in the next grain coherent with the next grain discontinuously [ 30

The Investigation on the Fabrication and Characterization

2020/9/29the ZnO-doped PZT-PZN-PMnN with compositions at near the morphotropic phase boundary is described as follows: the 90 and 180 domains exist in the tetragonal phase, while the 71, 109, and 90 domains are located in the rhombohedral phase, and

Final Technical Report: Grain Boundary Complexions

2012/10/15An exploratory study was carried out wherein grain boundary segregation in a model binary metallic alloy (Ni-doped W) was characterized as a function of temperature and dopant concentration. Doped specimens were prepared using high purity chemicals, sintered in flowing H2/N2 mixture, and examined using Auger spectroscopy and more electron microscopy.

Atomic structures and electronic properties of

2016/4/13Grain boundary (GB) is one main type of defects in two-dimensional (2D) crystals, and has significant impact on the physical properties of 2D materials. Phosphorene, a recently synthesized 2D semiconductor, possesses a puckered honeycomb lattice and outstanding electronic properties.

Fracture Resistance of Structural Alloys

replaced by precipitation of fine (Fe,Ni)3Ti phases from martensite, obtained by aging. How- ever, under certain conditions, precipitation of phases at grain boundaries leads to deterioration in toughness. Hence, chemistry, processing, and heat treatment

Fracture Resistance of Structural Alloys

replaced by precipitation of fine (Fe,Ni)3Ti phases from martensite, obtained by aging. How- ever, under certain conditions, precipitation of phases at grain boundaries leads to deterioration in toughness. Hence, chemistry, processing, and heat treatment

Grain boundary structure and interfacial complexions

In this thesis, we study these problems by focusing on tailoring the grain boundary structure and chemistry and propose a methodology that can be used to mitigate those challenges. First, we study the plastic flow and failure as a function of grain boundary volume fraction (i.e., grain size) using microcompression in a nanocrystalline Ni-W.

Tailoring nanocomposite interfaces with graphene to

A Ni-B emulsion was prepared by mixing 7 g of Ni(NO 3) 2 6H 2 O (catalyst) and 4 g of amorphous boron powders (boron source) into 10 ml of ethanol under ultrasonic vibration. The carbon fiber cloths were cut into small pieces, immersed in the Ni-B emulsion, and dried at 70C in a preheated oven for 3 hours.

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