Microstructure evolution and interface structure of Al-40 wt% Si composites produced by high-energy ball milling

Chen, Yuanyuan; Hu, Zhi Yi; Xu, Yifei; Wang, Jiangyong; Schützendübe, Peter; Huang, Yuan; Liu, Yongchang; Wang, Zumin

doi:10.1016/j.jmst.2018.10.005

Cited by 47 publications

(7 citation statements)

References 38 publications

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“…However, traditional NPG-preparation methods are relatively complicated and have many limitations, , such as the inevitable occurrence of residual inert elements, intricate preparation process of the precursor alloy, harsh corrosion conditions, and existence of microcracks. Very recently, NPG was also found to be achievable through a so-called metal-induced crystallization (MIC) − process. Given this background, in this work, we have employed a MIC-based solid phase reaction to prepare NPGs with irregularly shaped Au-nanobranch structures and further investigated them as new electrocatalysts for EORs.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrocatalytic Activities toward the Ethanol Oxidation of Nanoporous Gold Prepared via Solid-Phase Reaction

Zhang

Chen

Yang

et al. 2019

ACS Appl. Energy Mater.

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The rational design of highly active electrocatalysts for the ethanol electrooxidation reaction (EOR) is important for future commercial applications of efficient direct ethanol fuel cells. Herein, we describe application of a solid-phase reaction for the creation of a well-defined, high-efficiency, nanoporous gold (NPG) electrocatalyst for EOR. The evaluation of the feature size and physical properties of the NPG electrocatalysts was undertaken using field-emission scanning electron microscopy and high-resolution transmission electron microscopy. Additionally, the catalytic performance of the prepared NPG electrocatalysts was determined using cyclic voltammetry (CV) and chronoamperometry (CA), with results indicating that their enhanced electrocatalytic activities and long-term durability were highly dependent upon morphology. The created NPG exhibited a mass activity of 308 mA mgAu –1 toward EOR in alkaline media, which is much higher than those of nanostructured Au catalysts. In particular, 800-cycle CV and 2000-s CA tests in alkaline solution consistently suggested excellent long-term stability and durability of the NPG. Our findings suggest the developed NPG as a promising electrocatalyst and an ideal substrate for multifunctional electrocatalysts for EOR.

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Section: Introductionmentioning

confidence: 99%

Enhanced Electrocatalytic Activities toward the Ethanol Oxidation of Nanoporous Gold Prepared via Solid-Phase Reaction

Zhang

Chen

Yang

et al. 2019

ACS Appl. Energy Mater.

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“…However, the crystallization temperature can be reduced to as low as 100 °C by placing the a-Ge in contact with crystalline Al or Au (c-Au) [17,18]. MIC has been found to originate from atomic scale interactions and the interdiffusion of metal and amorphous semiconductors [19,20].…”

Section: Introductionmentioning

confidence: 99%

Beyond dealloying: development of nanoporous gold via metal-induced crystallization and its electrochemical properties

et al. 2019

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Nanoporous metals (NPMs) possess a number of intriguing properties that result in NPMs being an important family of nanomaterials for many advanced applications. However, the methods of preparing NPMs are relatively complicated and have many limitations, which have hindered the commercial application of NPMs thus far. By introducing metal-induced crystallization, a solid-phase reaction method for preparing NPMs was developed in this study, which is highly efficient and environmentally friendly. The microstructure of the prepared nanoporous gold (NPG) was characterized on an atomic scale by scanning electron microscopy and high-resolution transmission electron microscopy. The results confirmed that the solid-phase reaction method is an effective alternative means of preparing highly pure NPG. The results of electrochemical tests demonstrated that thus-prepared NPG possesses higher electrocatalytic activity than other types of gold electrodes toward oxygen reduction in alkaline media. The combination of a simple preparation process and higher activity suggests that the developed method may promote the future use of NPG in new energy applications, such as fuel cells and metal-air batteries.

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“…As shown in Figure 9, during the MA process, a lot of iron (Fe) from the milling medium was incorporated into the inner of the powders and then enclosed by them. Additionally, the interaction between ball-to-wall and ball-to-ball collisions is responsible for the recurrent fracturing, welding, and rewilding of particles that happened during the MA process [48,49].…”

Section: Characterization Of Ti09cr01c Powders Prepared Via Mamentioning

confidence: 99%

Spark Plasma Sintering of Nanostructured TiCrC Carbides Prepared via Mechanical Alloying

Mhadhbi¹,

Dağ²,

Avar³

et al. 2022

Preprint

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In order to produce nanostructured Ti0.9Cr0.1C powders, an elemental powder mixture of titanium, chromium, and graphite is milled in this work using a high-energy ball mill for various milling times. Microstructural characteristics such as crystallite size, microstrain, lattice parameter, and dislocation density are determined using X-ray diffraction (XRD). Mechanical alloying successfully produced nanocrystalline (Ti,Cr)C with an average crystallite size of 11 nm. This size of the crystallites is also directly verified using transmission electron microscopy (TEM). Scanning electron microscopy (SEM) was used to investigate the morphology of the samples. The novelty of this work is advancing the scientific understanding of the effect of milling time on the particle size distribution and crystalline structure, and also understanding the effect of the spark plasma sintering on the different properties of the bulks. Densified cermet samples were produced from the nanocrystalline powders, milled for 5, 10 and 20 hours by SPS process at 1800 degrees for 5 min under a pressure of 80 MPa. Phase changes of the produced cermets were examined according to XRD, SEM/EDX analyses. Significant amounts of Cr and Fe elements were detected, especially in the 20 h milled cermet. The bulk forms of the milled powders for 5 and 20 h had a relative density of 98.43 and 98.51 %, respectively. However, 5 h milled cermet had 93.3 HRA because of the more homogeneous distribution of the (Ti,Cr)C phase, the low iron content and high relative density. According to the 0.0011 mm/year corrosion rate, and 371.68 kΩ*cm2 charge transfer resistance obtained from the potentiodynamic polarization and EIS tests, the 20 h cermet was the specimen with the highest corrosion resistance.

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Microstructure evolution and interface structure of Al-40 wt% Si composites produced by high-energy ball milling

Cited by 47 publications

References 38 publications

Enhanced Electrocatalytic Activities toward the Ethanol Oxidation of Nanoporous Gold Prepared via Solid-Phase Reaction

Enhanced Electrocatalytic Activities toward the Ethanol Oxidation of Nanoporous Gold Prepared via Solid-Phase Reaction

Beyond dealloying: development of nanoporous gold via metal-induced crystallization and its electrochemical properties

Spark Plasma Sintering of Nanostructured TiCrC Carbides Prepared via Mechanical Alloying

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