Article
Engineering, Chemical
Yujie Cui, Yufan Zhao, Haruko Numata, Kenta Yamanaka, Huakang Bian, Kenta Aoyagi, Akihiko Chiba
Summary: The research demonstrates that the limitation of reducing powder size by increasing the rotation electrode speed is mainly due to the increased probability of adjacent droplets recombining and the decreased tendency of granulation; the effects of additional Ar/He gas flowing on powder formation are determined by the cooling effect, the disturbance effect, and the inclined effect of the residual electrode end face.
Article
Metallurgy & Metallurgical Engineering
Zhenbo Zuo, Rui Hu, Xian Luo, Qingxiang Wang, Chenxi Li, Zhen Zhu, Jian Lan, Shujin Liang, Hongkui Tang, Kang Zhang
Summary: The characteristics and solidification behavior of Ti-48Al-3Nb-1.5Ta powder produced by SS-PREP (R) were analyzed. It was found that with the increase in particle size, the surface structure changed from smooth to dendritic morphology, and the flow ability improved. The powder was mainly composed of alpha(2) phase and gamma phase, and the content of gamma phase increased with the increase in particle size, leading to a decrease in hardness.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Gang Ruan, Chang Liu, Hongqiao Qu, Chuan Guo, Gan Li, Xinggang Li, Qiang Zhu
Summary: This paper compared the application of IN718 powders prepared by gas atomization (GA) and plasma rotating electrode process (PREP) in LPBF process. The results showed that the PREP powder had better flowability and processing window, and could achieve more stable mechanical properties compared to the GA powder.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Ming Xia, Yongxiong Chen, Kewei Chen, Yonggang Tong, Xiubing Liang, Baolong Shen
Summary: A novel refractory high-entropy alloy (RHEA) spherical powder WTaMoNbZr was successfully synthesized and exhibited excellent mechanical properties and spheroidization effect. The powder has potential applications in protective coatings, additive manufacturing, etc. This study provides a new approach to prepare spherical RHEA powder, which is of great significance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Applied
J. Liu, L. Nie, Y. Xian, X. Lu
Summary: The study found that adding a small amount of nitrogen or oxygen to argon can make the plasma channel smooth, while the rotational frequency of the electrode does not affect the appearance of the plasma channel. Optical emission spectra show that adding O-2/N-2 reduces the emission intensity of transitions from excited argon levels to metastable states, leading to a transition of the discharge channel's nature.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Review
Materials Science, Multidisciplinary
Hossein Sehhat, Jackson Chandler, Zane Yates
Summary: The plasma spheroidization process can enhance particle geometries of powders from various materials, particle size distributions, and initial particle geometries. The process parameters, such as powder feed rate, gas flow rates, and chamber pressure, have an impact on powder characteristics like particle size distribution, microstructure, and porosity. A tradeoff exists among process parameters, spheroidization ratio, and evaporation rate, affecting the overall spheroidization of particles.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Alina K. Mazeeva, Artem Kim, Nikolay E. Ozerskoi, Aleksey Shamshurin, Nikolay G. Razumov, Denis Nazarov, Anatoliy A. Popovich
Summary: A novel approach combining mechanical alloying and plasma spheroidization was used to produce Ni36Al27Co37 spherical powder, which was systematically studied for structure homogenization and lamella thickness determination. The powder obtained meets the requirements of selective laser melting technology and can be used as a functional filler in various magnetic composites.
Article
Materials Science, Ceramics
Changshu Xiang, Xiaofeng Wang, Jun Yang, Hutian Li, Xiaopu Fan, Zhenghao Ge
Summary: In this study, high-quality 316H austenitic stainless steel powder was prepared by combining electroslag remelting and plasma-rotating electrode process. The properties of powders with different particle sizes, such as oxygen content, surface morphology, and flowability, were studied. The results showed that the powder had a bimodal particle size distribution and good flowability, making it suitable for 3D printing.
POWDER METALLURGY AND METAL CERAMICS
(2022)
Article
Physics, Applied
Jiang-Hong Sun, Su-Rong Sun, Chong Niu, Hai-Xing Wang
Summary: The study applied a 2D model to investigate plasma-electrode interaction in a laminar argon DC plasma torch, considering the effects of different cathodes on plasma characteristics. The results show that different cathodes significantly influence the current density and potential drop in the plasma column, leading to slightly different torch exit parameters.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Chaoyue Chen, Longtao Liu, Ruixin Zhao, Tingwei Cao, Tao Hu, Songzhe Xu, Sansan Shuai, Shuo Yin, Jiang Wang, Hanlin Liao, Zhongming Ren
Summary: It is discovered that reactive nitrogen atmosphere can effectively modulate the microstructure and improve the mechanical properties of Ti6Al4V alloys fabricated by laser powder bed fusion (L-PBF). Increasing nitrogen content leads to the refinement of martensite alpha' and the interruption of beta phase growth, as well as the formation of beta lamella. The higher nitrogen content also results in increased micro-strain and dislocation density. By introducing 25 vol% nitrogen content in the atmosphere, the L-PBF Ti6Al4V alloys exhibit a significant increase in maximum compressive strength and maximum compressive strain.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Physics, Fluids & Plasmas
Zili Chen, Jingwen Xu, Shimin Yu, Hao Wu, Xiaojiang Huang, Zhijiang Wang, Lianbo Guo, Wei Jiang, Ya Zhang
Summary: This work developed a numerical model for transmission lines based on the Lax-Wendroff method and achieved nonlinear bidirectional coupling among the lumped-element model, transmission line model, and electrostatic particle-in-cell model. It was found that the transmission lines can change the impedance matching of the device and significantly affect the plasma properties.
PHYSICS OF PLASMAS
(2022)
Article
Chemistry, Physical
Ahmad Raza, Camille Pauzon, Sophie Dubiez-Le Goff, Eduard Hryha
Summary: The atmosphere plays a crucial role in the degradation of powder during laser powder bed fusion, affecting spatter generation, thermal history, and oxidation. Understanding the relationship between atmosphere and spatter properties is essential for improving powder recyclability and process sustainability.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Cecilia Montero, Cristian Gino Ramirez, Lisa Munoz, Mamie Sancy, Manuel Azocar, Marcos Flores, Alfredo Artigas, Jose H. Zagal, Xiaorong Zhou, Alberto Monsalve, Maritza Paez
Summary: Climate change has driven the need to reduce carbon dioxide emissions, prompting the study of lighter alloys like magnesium for transport applications. However, magnesium alloys are prone to corrosion, leading to extensive research on surface treatments. This study investigates the impact of argon plasma pretreatment on the surface properties of an AZ31 magnesium alloy, specifically focusing on surface reactivity enhancement. The results show that the pretreatment increases surface energy, roughness, and oxygen species, thereby improving the protection capacity against corrosion.
Article
Materials Science, Multidisciplinary
Salvator Nigarura, Rahul Shah, Teemu Karhumaa, Juan L. Trasorras
Summary: This study introduces a new WHA powder for BJ3DP and compares it to existing powders. The physical properties and green strength of the new powder after BJ3DP are reported. Differences in sintering and microstructural evolution between the new powder and existing powders were investigated. The new powder shows superior green strength and achieves mechanical properties that match conventionally processed WHA.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Chemistry, Physical
Mingyuan Zhang, Taotao Cai, Weiliang Lu, Shili Zheng, Ying Zhang, Yi Zhang
Summary: A novel sintering-deoxygenation process was proposed to fabricate Ti-6Al-4V alloy powder with low-cost and low-grade materials. The sintering shrinkage was affected by temperature, holding time, and raw materials, while the oxygen content in precursors influenced the phase composition and diffraction peaks. The hydrogen-assisted Mg deoxygenation method effectively reduced the oxygen level in the final Ti-6Al-4V powders, meeting the requirements of GB/T 34486-2017.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Ping Zhang, Xiujie Yue, Yeran Gao, Zhenyong Lin, Shunxiang Wang, Songting Zhang
Summary: This paper investigates the strengthening mechanism of highspeed cutting and solid particle-entrained waterjet peening (HSC-WJP) composite reinforcement on 7075-T6 aluminum alloy. The research results show that composite reinforcement can improve surface quality, reduce surface pits and roughness, and decrease the size of precipitation-free zone (PFZ) at grain boundaries.
Article
Materials Science, Multidisciplinary
Sangyoon Lee, Hwi Yoon, Sanghun Lee, Seung-min Chung, Hyungjun Kim
Summary: The wettability of metal oxides, particularly HfO2 thin films deposited via atomic layer deposition, and its correlation with surface free energy have been studied. It was found that surface oxygen species significantly affect the intrinsic hydrophilicity of HfO2 thin films, and the crystalline orientations also evolve with film thickness.
Article
Materials Science, Multidisciplinary
Changdong Yin, Yiwen Wu, Zhou Xu, Dongdong Ye, Jun Yao, Jianjun Chen, Qiang Liu, Xin Ge, Meiling Ding
Summary: This study proposed a new strategy to indirectly estimate the hydrogen diffusivity of metallic materials under tensile stress by combining the electrochemical hydrogen permeation test (EHPT), the hydrogen diffusion descriptive equation based on Fick's law, and hydrogen pre-charged tensile test. The results showed that the hydrogen permeation curve obtained was highly approximate to the theoretical trend. The hydrogen embrittlement (HE) susceptibility of the specimens increased with increasing stress.
Article
Materials Science, Multidisciplinary
Huan Luo, Wei-yi Wang, Xin Yu, Xian-jun Lei, Lang Liu, Guo-zheng Zha, Wen-long Jiang, Bin Yang, Bao-qiang Xu
Summary: Separating selenium and tellurium is a general challenge in material and non-ferrous metallurgical industries. This paper proposes a novel method that achieved efficient separation of selenium and tellurium using gas-liquid equilibrium phase diagram and valence regulation-vacuum gasification technique.
Article
Materials Science, Multidisciplinary
Fan Zhang, Rong Xin Wang, Aiqin Tian, Fangzhi Li, Jianping Liu, Hui Yang
Summary: Deposition of Pd/Pt/Au three-layer films on p-GaN under high and ultra-high vacuum conditions was studied to investigate the electrical contact properties. Linear I-V curves were observed in samples deposited under ultra-high vacuum conditions, while nonlinear I-V characteristics were obtained in samples deposited under high vacuum conditions. The study also found that the samples deposited under high vacuum conditions had higher amounts of oxygen and Pd oxide. The oxide layer had an additional influence on the electrical characteristics of the Pd/Pt/Au/p-GaN contact.
Article
Materials Science, Multidisciplinary
Hongli Liu, Chengzhe Liu, Ying Sui, Zhongxian Liu, Tiangang Zhang, Zhiqiang Zhang, Shuang Sun, Jianwei Jia
Summary: This study utilized polysiloxane and hafnium carbide to produce Si-N-C-O-Hf hybridized ceramic fibers, and obtained ceramic fibers with hemispherical particles on the surface through electrostatic spinning and pyrolysis. The ceramic fibers exhibited excellent thermal stability, oxidation resistance, and high temperature insulation.
Article
Materials Science, Multidisciplinary
M. Abaker, Nazar Elamin Ahmed, A. Saad, H. F. Khalil, E. M. M. Ibrahim, A. M. Adam
Summary: This paper systematically studied the internal structure and thermoelectric properties of In1-xGaxSb alloys prepared by melting synthesis at 1123 K. The results showed that doping with Ga in the In sites led to a significant increase in the Seebeck coefficient and power factor, while reducing the thermal conductivity. The maximum dimensionless figure of merit was observed at 403 K.
Article
Materials Science, Multidisciplinary
Fucheng Yu, Jinlong Ren, Jielin Zhang, Haiyang Chen, Xin Tian, Chenchen Feng, Cuixia Li, Jianbin Zhang, Xianxi Tang, Xiaogang Hou
Summary: An environmentally friendly ZnO@BiVO4 composite photocatalyst was prepared using in-situ self-assembly and solvothermal methods, demonstrating good photocatalytic performance. The mass ratio of BiVO4 and NCZ was found to influence the photocatalytic performance of the composite.
Article
Materials Science, Multidisciplinary
Yaoming Shao, Pingping Zheng, Tianhao Dong, Lianghuan Wei, Haifei Wu, Jianxiao Si
Summary: In this paper, Mg3Bi2 films were prepared on glass substrate using magnetron sputtering, and the phase composition and thermoelectric properties of the films were investigated with different atomic ratios. The films displayed a metastable cubic phase and high conductivity when the atomic ratio exceeded stoichiometry.
Article
Materials Science, Multidisciplinary
I. V. Uimanov, D. L. Shmelev, S. A. Barengolts
Summary: A two-dimensional axisymmetric model has been developed to study the prebreakdown processes in a cathode microprotrusion under an external electric field. The simulation results show that electrohydrodynamic instability leads to the formation of a nanometer-sized conical protrusion on the microprotrusion tip, significantly accelerating the heating process.
Article
Materials Science, Multidisciplinary
Weilun Zhang, Di Yang, Feng Gong, Yongjun Chen, Tian Chen, Zhiwen Xie, Sirui Yang
Summary: A novel Pt doping method was designed to improve the thermal stability of CrWN coating. The doping of Pt atoms effectively blocks the coherent growth of the grains and creates a significant mixing effect, resulting in a smooth surface with uniform element distribution.
Article
Materials Science, Multidisciplinary
Xiaoye Wang, Xiaoguang Yang, Wenna Du, Tao Yang
Summary: In this study, the effects of multiple growth parameters on self-catalyzed growth of InAs/GaSb axial heterostructured nanowires on Si substrate by MOCVD were investigated. It was found that the growth temperature and switching time have significant influences on the nanowire growth.
Article
Materials Science, Multidisciplinary
Weizhong Cui, Yan Zhao, Can Cui, Xing Liu, Beili Pang, Jianguang Feng, Hongzhou Dong, Liyan Yu, Lifeng Dong
Summary: This study introduces Co2+ cations into Cs2AgBiBr6 film to improve its quality, grain size, and conductivity, resulting in enhanced solar cell efficiency.
Article
Materials Science, Multidisciplinary
Jian Wang, Ke Yang, Xianming Cheng, Yalin Lu, Ganghui Wu, Yang Zhang, Yun Kan
Summary: The corrosion behavior and microstructural evolution of Sc microalloyed Al-3.2Cu-1.5Li alloys were investigated in detail. The microstructural results showed higher levels of dislocations density in the Sc microalloyed sample, which resulted in significantly refined grains and T1 precipitates. Microalloying with Sc changed the corrosion mode of the alloy and localized corrosion was found to occur preferentially at the subgrain within unrecrystallized grains with high grain stored energy.
Article
Materials Science, Multidisciplinary
Weifeng Liu, Na Liu, Kaiqiang Song, Meiqin Zeng, Zhongchen Lu
Summary: Monoclinic WO3 prepared through plasma milling exhibits higher photocatalytic activity due to its higher surface area, increased oxygen vacancies, and defects.