☆ 4.7 Article

In-situ Sip/A380 alloy nano micro composite formation through cold spray additive manufacturing and subsequent hot rolling treatment: Microstructure and mechanical properties

JOURNAL OF ALLOYS AND COMPOUNDS (2019)

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期刊

JOURNAL OF ALLOYS AND COMPOUNDS
卷 780, 期 -, 页码 597-606

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.11.399

关键词

Cold spray; Post spray rolling treatment; Microstructure; Mechanical properties; In-situ composite

类别

Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering

资金

  1. National Natural Science Foundation of China [51671205]

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Cold gas dynamic spray (cold spraying, CS) has emerged as a promising solid state manufacturing technique to fabricate thick metallic deposits with limited risk of oxidation, phase transformations and residual thermal stresses. As-sprayed deposits usually exhibit poor mechanical properties and often require post-spray heat treatments to reduce inter-splat defects. In most of the cases, traditional heat treatments offer limited benefits to rejuvenate the mechanical properties of the deposit. This preliminary work presents an effective way to modify the microstructure and improve the mechanical properties of cold sprayed A380 aluminum alloy. As-sprayed alloy deposits were subjected to hot rolling treatments with different thickness reductions. Results suggest that the hot rolled samples show better strength and ductility compared with their as-sprayed state. Microstructural evolution and resulting mechanical properties, at different processing conditions, were analyzed through optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), high resolution transmission electron microscopy (HRTEM) and tensile tests. Sample with thickness reduction of 40% displayed highest values of ultimate strength (UTS, 420 +/- 2.1 MPa) and elongation (Elf, 5 +/- 2.3%) compared with the corresponding values of as-sprayed (100 +/- 13.4 MPa, 0%) and conventionally heat treated (186 +/- 17 MPa, 0.93 +/- 0.05%) samples. The improvement in mechanical properties of the rolled samples were mainly attributed to the progressive elimination/reduction of inter-splat defects together with in-situ composite microstructure formation. EBSD and HRTEM revealed that in-situ composite structure was formed through progressive refinement and uniform distribution of Si particles in alpha-Al matrix containing coherent theta' precipitates. (C) 2018 Elsevier B.V. All rights reserved.

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Investigation on bio-synthesized Ni- and Al-doped cobalt ferrite using lemon juice as eco-fuel

Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad

Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.

JOURNAL OF ALLOYS AND COMPOUNDS (2024)

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Article Chemistry, Physical

Cu, Ni and Ag ions assisted preparation of nonpolar preferential oriented ZnO films with controlled morphology and optical properties

Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi

Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.

JOURNAL OF ALLOYS AND COMPOUNDS (2024)

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Article Chemistry, Physical

Characterization of magnetic FeCo particles with controlled bimetallic composition

Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang

Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.

JOURNAL OF ALLOYS AND COMPOUNDS (2024)

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Article Chemistry, Physical

Micro-alloying effects of Ta and B on nano-oxides and grain boundaries in 13CrWTi-ODS ferritic alloys

Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang

Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.

JOURNAL OF ALLOYS AND COMPOUNDS (2024)

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Article Chemistry, Physical

Nitrogen-doped reduced graphene oxide/black phosphorus quantum dot composites for electrocatalytic treatment of choroidal melanoma

Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang

Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.

JOURNAL OF ALLOYS AND COMPOUNDS (2024)

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Article Chemistry, Physical

Significantly enhanced magnetism in cobalt ferrite by manganese and terbium co-doping

Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu

Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.

JOURNAL OF ALLOYS AND COMPOUNDS (2024)

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Article Chemistry, Physical

High-performance low-temperature solid oxide fuel cell with nanostructured lanthanum strontium cobaltite/yttria-stabilized zirconia cathode via advanced co-sputtering

Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee

Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.

JOURNAL OF ALLOYS AND COMPOUNDS (2024)

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Article Chemistry, Physical

Amorphous quaternary alloy nanoplates for efficient catalysis of hydrogen evolution reaction

Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu

Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.

JOURNAL OF ALLOYS AND COMPOUNDS (2024)

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