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Experiments and Theoretical Simulations on Mechanical Properties of High Performance Surfaces and Structures

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A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Mechanics of Materials".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 7805

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Special Issue Editors

Prof. Dr. Zhenyu Zhang

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Guest Editor

School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China
Interests: ultra-precision grinding; chemical mechanical polishing (CMP) and nano-precision surface manufacturing

Prof. Dr. Yang Lu

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Guest Editor

Department of Mechanical Engineering, the City University of Hong Kong, Hong Kong 999077, China
Interests: micro/nanomechanics; in situ electron microscopy; elastic strain engineering; wide-bandgap semiconductor; bio-inspired materials design; nanomanufacturing
Special Issues, Collections and Topics in MDPI journals

Dr. Fanning Meng

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Guest Editor

School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China
Interests: ultra‐precision machining technology

Special Issue Information

Dear Colleagues,

This special issue focuses on the mechanical and tribological properties at room, high and low temperatures of high performance surfaces and structures. High performance surfaces and structures are manufactured, not limited to the following machining or manufacturing methods, by additive manufacturing, polishing, grinding, cutting consisting of turning, drilling, milling, boring, etc., laser, electron beam, ion beam on silicon, diamond, sapphire, quartz, glass, and other hard-brittle or soft-brittle materials, or on nickel, titanium, magnesium, aluminum alloys. They are also prepared by composites including graphene, hexagonal boron nitride, carbon nanotube, fullerene, or other advanced two-dimensional materials. The special issue aims to report the mechanical and tribological properties of experiments and simulations, such as molecular dynamics, first principle theories, Monte Carlo simulations, finite element simulations, etc., under extreme conditions containing high and low temperatures, pressures, energies and frequencies, on the surfaces and structures of brittle materials and alloys used for aerospace, weapons, marine engineering, semiconductor, optoelectronics and microelectronics industries. It also publishes the origin and evolution of defects of alloys and brittle materials at nanoscale and atomic scale, which is performed by in situ mechanics and tribology in high resolution transmission electron microscopy used for high performance surfaces and structures in nanomanufacturing, atomic manufacturing or close to atomic manufacturing.

Prof. Dr. Zhenyu Zhang
Prof. Dr. Yang Lu
Dr. Fanning Meng
Guest Editors

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

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Keywords

nanomanufacturing
atomic manufacturing
additive manufacturing
tribology
alloys

Published Papers (4 papers)

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Research

21 pages, 14040 KiB

Open AccessArticle

Experimental Investigation on the Surface Formation Mechanism of NdFeB during Diamond Wire Sawing

by Bin Wu, Zhenyu Zhang, Junyuan Feng, Fanning Meng, Shengzuo Wan, Xuye Zhuang, Li Li, Haoran Liu and Fuxu Zhang

Materials 2023, 16(4), 1521; https://doi.org/10.3390/ma16041521 - 11 Feb 2023

Cited by 1 | Viewed by 1282

Abstract

Diamond wire sawing is widely used in processing NdFeB rare earth permanent magnets. However, it induces periodic saw marks and fracture chipping pits, which severely affect the flatness and surface quality of the products. In this study, the lateral motion of the diamond wire was monitored to determine the surface formation mechanism. Then, a white light interferometer and an SEM were used to observe the sawed surface profile. Finally, the surface quality was quantitatively studied by identifying the area rate of fracture chipping pits with an image recognition MATLAB script. According to the observation results, the calculation formula of PV which is related to the process parameters was deduced. Additionally, by combining the fracture rate and wire vibration, a novel method was proposed to investigate the optimal process parameters. It can be found that the surface quality sawed at P = 0.21 MPa, v_f = 0.2 mm/min, and v_s = 1.8 m/s remains better than when sawed at P = 0.15 MPa, v_f = 0.1 mm/min, and v_s = 1.8 m/s, which means the sawing efficiency can be doubled under such circumstances, i.e., when the surface quality remains the same. Full article

(This article belongs to the Special Issue Experiments and Theoretical Simulations on Mechanical Properties of High Performance Surfaces and Structures)

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17 pages, 6808 KiB

Open AccessArticle

Microstructure and Mechanical Properties of Nanoparticulate Y₂O₃ Modified AlSi10Mg Alloys Manufactured by Selective Laser Melting

by Fuxu Zhang, Zhenyu Zhang, Qinming Gu, Xuezhang Hou, Fanning Meng, Xuye Zhuang, Li Li, Bingxin Liu and Junyuan Feng

Materials 2023, 16(3), 1222; https://doi.org/10.3390/ma16031222 - 31 Jan 2023

Cited by 2 | Viewed by 1471

Abstract

AlSi10Mg has a good forming ability and has been widely accepted as an optimal material for selective laser melting (SLM). However, the strength and elongation of unmodified AlSi10Mg are insufficient, which limits its application in the space industry. In this paper, yttrium oxide (Y₂O₃) nanoparticles modified AlSi10Mg composites that were manufactured using SLM. The effects of Y₂O₃ nanoparticles (0~2 wt.% addition) on the microstructure and mechanical properties of AlSi10Mg alloys were investigated. An ultimate tensile strength of 500.3 MPa, a yield strength of 322.3 MPa, an elongation of 9.7%, a good friction coefficient of 0.43, and a wear rate of (3.40 ± 0.09) ×10⁻⁴ mm³·N⁻¹·m⁻¹ were obtained with the addition of 0.5 wt.% Y₂O₃ nanoparticles, and all these parameters were higher than those of the SLMed AlSi10Mg alloy. The microhardness of the composite with 1.0 wt.% Y₂O₃ reached 145.6 HV_0.1, which is an increase of approximately 22% compared to the unreinforced AlSi10Mg. The improvement of tensile properties can mainly be attributed to Orowan strengthening, fine grain strengthening, and load-bearing strengthening. The results show that adding an appropriate amount of Y₂O₃ nanoparticles can significantly improve the properties of the SLMed AlSi10Mg alloy. Full article

(This article belongs to the Special Issue Experiments and Theoretical Simulations on Mechanical Properties of High Performance Surfaces and Structures)

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18 pages, 5706 KiB

Open AccessArticle

Dispersion and Polishing Mechanism of a Novel CeO₂-LaOF-Based Chemical Mechanical Polishing Slurry for Quartz Glass

by Zifeng Zhao, Zhenyu Zhang, Chunjing Shi, Junyuan Feng, Xuye Zhuang, Li Li, Fanning Meng, Haodong Li, Zihang Xue and Dongdong Liu

Materials 2023, 16(3), 1148; https://doi.org/10.3390/ma16031148 - 29 Jan 2023

Cited by 8 | Viewed by 2350

Abstract

Quartz glass shows superior physicochemical properties and is used in modern high technology. Due to its hard and brittle characteristics, traditional polishing slurry mostly uses strong acid, strong alkali, and potent corrosive additives, which cause environmental pollution. Furthermore, the degree of damage reduces service performance of the parts due to the excessive corrosion. Therefore, a novel quartz glass green and efficient non-damaging chemical mechanical polishing slurry was developed, consisting of cerium oxide (CeO₂), Lanthanum oxyfluoride (LaOF), potassium pyrophosphate (K₄P₂O₇), sodium N-lauroyl sarcosinate (SNLS), and sodium polyacrylate (PAAS). Among them, LaOF abrasive showed hexahedral morphology, which increased the cutting sites and uniformed the load. The polishing slurry was maintained by two anionic dispersants, namely SNLS and PAAS, to maintain the suspension stability of the slurry, which makes the abrasive in the slurry have a more uniform particle size and a smoother sample surface after polishing. After the orthogonal test, a surface roughness (S_a) of 0.23 nm was obtained in the range of 50 × 50 μm², which was lower than the current industry rating of 0.9 nm, and obtained a material removal rate (MRR) of 530.52 nm/min. Full article

(This article belongs to the Special Issue Experiments and Theoretical Simulations on Mechanical Properties of High Performance Surfaces and Structures)

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15 pages, 5987 KiB

Open AccessArticle

Study on Wear Mechanism of Helical Gear by Three-Body Abrasive Based on Impact Load

by Wei Yuan, Haotian Wang, Qianjian Guo, Wenhua Wang, Yuqi Zhu, Jie Yu and Xianhai Yang

Materials 2022, 15(12), 4135; https://doi.org/10.3390/ma15124135 - 10 Jun 2022

Cited by 1 | Viewed by 1791

Abstract

This study aimed to explore the wear characteristics and evolution mechanisms of large-scale wind power gears under the impact load of particles of the three-body abrasive Al₂O₃ (0.2 mg/mL) from four aspects: oil analysis, vibration analysis, amount of gear wear, and tooth-surface-wear profile analysis. A magnetic powder brake was used to simulate the actual working conditions. Combined with the abrasive particle monitoring and the morphology analysis of the tooth-surface-wear scar, by setting quantitative hard particles in the lubricating oil, the gears are mainly operated in the abrasive wear state, and wear monitoring and wear degree analysis are carried out for the whole life cycle of the gears. Oil samples were observed and qualitatively analyzed using a particle counter, a single ferrograph, a metallographic microscope, and a scanning electron microscope. The experiments demonstrate that the initial hard particles have a greater impact in the early wear stage of the gears (<20 h), and abrasive particle concentration increases by 30%. This means that Al₂O₃ particles accelerate the gear wear during the running-in period. The loading method of the impact load on the oblique gear exacerbates the abrasion particle wear and expands the stress concentration, which reduces the surface of large milling particles on the surface, and reduces the width of the tooth (the part above the pitch line is severely worn), which causes the gear to break into failure. The research provides help for analyzing the mechanism of abrasive wear of gears and predicting wear life. Full article

(This article belongs to the Special Issue Experiments and Theoretical Simulations on Mechanical Properties of High Performance Surfaces and Structures)

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