Article
Materials Science, Multidisciplinary
Zubin Chen, Xiaoguo Song, Yun Luo
Summary: The surface microstructural modifications of 2A12 aluminum alloy under 60 keV Ar ion bombardment were investigated. An amorphous layer with a thickness of approximately 130 nm, accompanied by polycrystalline aluminum, was formed on the surface. Al2CuMg precipitates were observed beneath the amorphous layer. The contact angles of diiodomethane and DI water on the alloy increased, and the surface energy of the alloy decreased after ion bombardment.
Article
Nanoscience & Nanotechnology
Juhee Oh, Hae Don Park, Minseok Gwak, Jungsub Lee, Sujung Son, Auezhan Amanov, Hyoung Seop Kim, Jae Bok Seol, Hyokyung Sung, Jung Gi Kim
Summary: By utilizing ultrasonic nanocrystalline surface modification (UNSM) on aluminum alloys, a new heterogeneous microstructure was designed, resulting in increased strength and ductility of the material. This study demonstrates that a high shear strain and controlled processing temperature can effectively enhance the mechanical properties of low-melting temperature metallic alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Qiwen Xiong, Po Zhang, Wenzheng Zhai, Xiaoshuang Luo, Zhaobing Cai, Feilong Zheng, Le Gu
Summary: This paper investigates the effect of ultrasonic surface rolling (USR) on the fretting wear properties of the 7075 aluminum alloy. The results reveal that after USR treatment, the surface roughness was reduced, the hardness was increased, and the grains were refined. Moreover, the wear was reduced under oil lubrication conditions but increased under dry fretting conditions. The study concludes that the microstructure and mechanical properties of the 7075 aluminum alloy surface can be enhanced by the USR treatment.
Article
Materials Science, Coatings & Films
Binghan Huang, Yixuan Ye, Kai Wang, Li Zhang, Yalin Dong, Chang Ye
Summary: This study investigated the corrosion resistance of 7075-T6 aluminum alloy by immersing it in a 3.5% NaCl solution and subsequently repairing the sample surface using ultrasonic nanocrystal surface modification (UNSM). UNSM was found to effectively repair defects and improve stress corrosion crack (SCC) resistance. This improvement was attributed to the compressive residual stress and grain refinement caused by UNSM.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Yun-Soo Lee, Je-Ki Jung, Soo-Bae Kim, Su-Hyeon Kim, Cha-Yong Lim, Hyoung-Wook Kim, Won-Kyoung Kim, Soong-Keun Hyun
Summary: The study demonstrates that the application of thermomechanical treatment and Sr addition can significantly improve the mechanical properties and workability of ALDC12 aluminum alloy, enhancing the alloy's strength and ductility. This microstructural control method is of great significance for cast products.
MATERIALS CHARACTERIZATION
(2021)
Article
Multidisciplinary Sciences
L. Pezzato, C. Gennari, M. Franceschi, K. Brunelli
Summary: In this study, the effects of silicon morphology on the plasma electrolytic oxidation (PEO) coating of AlSi10Mg samples produced through laser powder bed fusion (L-PBF) were investigated. The results showed that the heat treatments modified the silicon distribution in the samples. The microstructure, composition, corrosion resistance, and hardness of the coatings were characterized, and it was found that the silicon distribution influenced the performance of the coatings, with the coatings on the as printed and annealed samples exhibiting better corrosion resistance.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Yusheng Zhang, Hongliang Ming, Jiang Lai, Lixia Gao, Jianqiu Wang, En-Hou Han
Summary: The fretting wear behavior of Zr alloy cladding tube under mixed fretting regime in a high-temperature pressurized water was explored. Adhesive wear was identified as the main wear mechanism, characterized by small-scale delamination at the center of the worn area and serious delamination on the worn edge. Observations revealed a long crack throughout the worn area along with other cracks propagating towards the substrate. The microstructural evolution during fretting wear, including the formation mechanisms of different layers, was analyzed.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Alireza Karimnejad, Mehrdad Ashjari, Akbar Heidarzadeh, Tohid Saeid
Summary: The study demonstrated that using optimal parameters for friction stir welding can improve the structure of rheocast alloys. Fillings voids through severe plastic deformation, eliminating porosities in the material. Friction stir welding results in the replacement of the semi-solid structure by finer equiaxed grains.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
W. W. Bian, Y. H. Lu, L. Z. Kang, Y. M. Han, L. Xin, X. Liu, T. Shoji
Summary: The early microstructure evolution of Alloy 690TT induced by fretting corrosion was investigated. The results showed that multiple material transfers of 405 SS resulted in the formation of nano-cavities, which provided nucleation sites for internal oxidation of the material transfer layer (MTL). The fretting corrosion-induced nano-grain boundaries offered high pathways for oxygen diffusion and accelerated oxidation process. The tribologically transformed structure (TTS) formed through continuous dynamic recrystallization, with the increase in geometrically necessary boundaries (GNBs) orientation.
Article
Engineering, Mechanical
Zheng-yang Li, Zhen-bing Cai, Wei Zhang, Rui-rui Liu, Zhong-bo Yang, Yong-jun Jiao
Summary: This study investigated the fretting corrosion behavior of zirconium alloy under different pH conditions. The morphology, microstructure, and wear mechanism of the alloy were analyzed. The results showed that the wear mechanism under acidic conditions is oxidation wear and abrasive wear. Additionally, the maximum wear volume was observed in the pH 1 condition.
Article
Engineering, Mechanical
Jian Pu, Yali Zhang, Xiaogang Zhang, Xinlu Yuan, Pingdi Ren, Zhongmin Jin
Summary: The fretting-corrosion performance of 6082 aluminum alloy in 3.5% NaCl solution was investigated by considering displacements and loads. A running condition fretting map (RCFM) was established. Different wear mechanisms were observed in PSR, MFR, and SR, with corrosion being accelerated in MFR and SR, but weakened in PSR.
Article
Engineering, Mechanical
I. M. Matos, J. A. Araujo, F. C. Castro
Summary: This study conducted fretting fatigue tests on AA1120 wires and compared them with AA1350 and AA6201 wires. The results showed that AA1120 wires had longer lives than AA1350 wires in axial fatigue tests, but had similar fatigue strengths to AA6201 wires in fretting fatigue tests.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Chemistry, Physical
Jithin Vishnu, A. R. Ansheed, Pearlin Hameed, K. Praveenkumar, Stefan Pilz, Ludovico Andrea Alberta, Sathya Swaroop, Mariana Calin, Annett Gebert, Geetha Manivasagam
Summary: This study investigates the effect of varying laser-peening fluences on the surface characteristics of a Ti22Nb alloy, revealing that higher fluences result in improved wear resistance and biocompatibility.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Manufacturing
T. Satish Kumar, S. Shalini, Titus Thankachan
Summary: In this study, AZ31-ZrC surface composites were prepared using friction stir processing with varying fractions of ZrC particles (5, 10, and 15 volume percentage) dispersed onto the AZ31 surface. The developed magnesium surface composites showed a homogeneous distribution of ZrC particles, contributing to the enhancement of their mechanical properties. The introduction of reinforcement particles increased the hardness and tensile strength, and the correlation between strengthening mechanisms and microstructure of the fabricated surface composites was analyzed. The wear behavior studies revealed that abrasive and delamination wear were the predominant wear mechanisms, and an increase in particle dispersion led to a reduction in wear.
MATERIALS AND MANUFACTURING PROCESSES
(2023)
Article
Engineering, Manufacturing
Abhishek Mehta, Le Zhou, Thinh Huynh, Sharon Park, Holden Hyer, Shutao Song, Yuanli Bai, D. Devin Imholte, Nicolas E. Woolstenhulme, Daniel M. Wachs, Yongho Sohn
Summary: The study investigated the improvement of buildability/printability and mechanical properties of AA6061 by alloying with 1% Zr for LPBF. Zr-modified AA6061 showed near full density, reduced porosity, and higher tensile properties compared to unmodified AA6061, attributed to significant grain refinement.
ADDITIVE MANUFACTURING
(2021)
Article
Green & Sustainable Science & Technology
Inkyu Yeo, Seongguk Bae, Auezhan Amanov, Sungho Jeong
Summary: By combining laser shock peening (LSP) with post-heat treatment, enhanced surface properties, improved toughness, and restored surface hardness and wear resistance can be achieved in Ti-6Al-4V LPBF fabricated products. This approach also effectively reduces the corrosion rate, showing promising results for enhancing both impact toughness and surface properties in LPBF-fabricated Ti-6Al-4V products.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2021)
Article
Chemistry, Physical
Ibrahim Karademir, Mustafa B. Celik, Fazil Husem, Erfan Maleki, Auezhan Amanov, Okan Unal
Summary: S500MC high strength low alloy automotive steel undergoes significant improvement in performance through constrained groove pressing and surface severe plastic deformation treatment, with ultrasonic nanocrystal surface modification achieving dual enhancement in strength and ductility, while severe shot peening not only improves ductility, but also leads to a slight decrease in strength.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Mechanical
Auezhan Amanov
Summary: The study investigated the influence of UNSM temperature on the tribological properties of Ti-6Al-4V alloy, finding that COF was reduced and wear resistance enhanced due to increased strength and smoothed surface. Abrasive wear caused the most damage in the wear track of the sample, with wear mechanisms comprehensively investigated based on experimental data and microstructural images.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Juhee Oh, Hae Don Park, Minseok Gwak, Jungsub Lee, Sujung Son, Auezhan Amanov, Hyoung Seop Kim, Jae Bok Seol, Hyokyung Sung, Jung Gi Kim
Summary: By utilizing ultrasonic nanocrystalline surface modification (UNSM) on aluminum alloys, a new heterogeneous microstructure was designed, resulting in increased strength and ductility of the material. This study demonstrates that a high shear strain and controlled processing temperature can effectively enhance the mechanical properties of low-melting temperature metallic alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Auezhan Amanov, Ruslan Karimbaev, Stephen P. Berkebile
Summary: Coating the high-pressure common rail injection system nozzles with WC-Co via thermal spray and treating them with ultrasonic nanocrystal surface modification (UNSM) can enhance wear resistance and performance. UNSM controls surface roughness and hardness through grain size refinement and pore reduction, resulting in improved wear performance compared to as-sprayed coating.
Article
Materials Science, Coatings & Films
Auezhan Amanov
Summary: This study investigated the effect of post-AM surface modification temperature on the tribological and tribocormsion properties of Co-Cr-Mo alloy, aiming to reduce COF, SWR, and improve TCR. The results showed that HT sample exhibited better performance than AT sample and as-printed Co-Cr-Mo alloy samples, indicating potential benefits for biomedical applications.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Coatings & Films
Sami Bin Humam, Gobinda Gyawali, Auezhan Amanov, Tae Ho Kim, Soo Wohn Lee
Summary: This study investigated the influence of codeposited TaC particles on the microstructure of Ni-W matrix and applied ultrasonic nanocrystal surface modification (UNSM) technique to explore the surface characteristics, mechanical, and tribological performance of Ni-W-TaC composite coatings. The incorporation of TaC in the microstructure and nanostructured surface modification significantly improved the microhardness and led to a reduction in the coefficient of friction under dry lubrication conditions.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Auezhan Amanov, Ruslan Karimbaev
Summary: The study showed that the newly developed dual UNSM technology can significantly improve rolling friction and rotary bending fatigue of ball screws, where the enhancement of surface integrity and the introduction of compressive residual stress play crucial roles. This technology can ensure smooth motion, low noise, small torque fluctuations, and extended service life of ball screws.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Auezhan Amanov
Summary: In this study, an ultrasonic nanocrystal surface modification (UNSM) technique was employed to enhance the mechanical properties of CuSn10Pb10 alloy by refining surface coarse grains into nano-grains. The formation of nano-grains containing some nano-twins attributed to the increase in surface hardness, yield strength and ultimate tensile strength after UNSM, which can be explained by the Hall-Petch relationship. The grain size refinement mechanism was attributed to the increase in dislocation density and the formation of new dislocations, causing a variation in grain orientation at low-angle grain boundaries.
Article
Nanoscience & Nanotechnology
Ruslan M. Karimbaev, Young-Sik Pyun, Auezhan Amanov
Summary: The beneficial effect of ultrasonic nanocrystal surface modification (UNSM) treatment on the mechanical properties and fatigue performance of Nickel-base 718 alloy fabricated by laser directed energy deposition (LDED) process was investigated in this study. The treatment demonstrated a significant enhancement in fatigue performance by introducing high compressive residual stress (CRS) and generating a nanostructured surface layer. Additionally, it was found that surface roughness decreased and hardness increased after the treatment.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Ruslan M. Karimbaev, In Sik Cho, Young Sik Pyun, Auezhan Amanov
Summary: The effect of ultrasonic nanocrystal surface modification (UNSM) treatment on the high-frequency fatigue behavior of Inconel 718 alloy fabricated by laser metal deposition (LMD) process was experimentally investigated in this work. The study found that the UNSM treatment at room and high temperatures significantly improved the surface morphology and hardness of the alloy, leading to enhanced fatigue performance. The formation of a nanostructured surface layer with reduced porosity and induced compressive residual stress after UNSM treatment played a key role in improving the fatigue life of the samples.
Article
Materials Science, Multidisciplinary
Seung-Hyon Song, Chang-Soon Lee, Tae-Hwan Lim, Auezhan Amanov, In-Sik Cho
Summary: The purpose of this study is to investigate the fractural behavior of a lead-free material containing bismuth in plain bearings. Comparing and analyzing two different Cu-based alloys, it was found that CuSn10Pb10 decomposed and formed pores under high tensile load, while CuSn10Bi7 maintained its original shape and exhibited work hardening.
Article
Chemistry, Physical
Seung-Hyon Song, Chang-Soon Lee, Tae-Hwan Lim, Auezhan Amanov, In-Sik Cho
Summary: Welding defects are common in large welded structures. This study explores the use of ultrasonic peening to compensate for the mechanical properties of overlap weld defects without repair welding. Experimental results show that ultrasonic peening can restore the fatigue life of weld plates and improve mechanical properties such as tensile strength and elongation.
Article
Chemistry, Physical
Auezhan T. Amanov, Gayrat A. Bahadirov, Ayder M. Nabiev
Summary: This article investigates the parameters of an improved pressure mechanism design for a roller machine used for squeezing wet materials. The factors influencing the pressure mechanism parameters are studied, focusing on providing the necessary force between the working rolls during the processing of moisture-saturated fibrous materials. A proposed pressure mechanism with working rolls mounted on levers is introduced, where the length of the levers remains unchanged to ensure a horizontal direction of the sliders. The study concludes by selecting the optimal process parameters and recommending the use of the proposed roller device to significantly increase productivity.
Article
Chemistry, Physical
Nurtoleu Magazov, Zarina Satbaeva, Bauyrzhan Rakhadilov, Auezhan Amanov
Summary: In this study, surface hardening of AISI 52100 bearing steel was performed using UNSM and EPSM, and their effects on wear resistance were investigated. The results showed that both UNSM and EPSM treatments significantly improved the wear resistance of the material.
