Article
Engineering, Manufacturing
Mohammadreza Asherloo, Ziheng Wu, Mike Heim, Dave Nelson, Muktesh Paliwal, Anthony D. Rollett, Amir Mostafaei
Summary: L-PBF processed HDH Ti-6Al-4V alloy achieves near-full density with a particle size distribution of 50-120 μm. Mechanical grinding reduces surface roughness and improves fatigue strength. Fracture behavior shows a combination of brittle and ductile fractures.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
O. Dolev, S. Osovski, A. Shirizly
Summary: The tensile behavior and fracture toughness of a hybrid Ti-6Al-4V alloy were examined, showing good properties without a preference for crack growth. The hybrid manufacturing approach studied here expands the current limitations of large-scale critical components and allows for higher throughput.
ADDITIVE MANUFACTURING
(2021)
Article
Nanoscience & Nanotechnology
Haiyang Fan, Chengcheng Wang, Yujia Tian, Kun Zhou, Shoufeng Yang
Summary: This study investigated the feasibility of using L-PBF to fabricate two Ti-6Al-4V-based bimetals, Ti-6Al-4V/γ-TiAl and Ti-6Al-4V/Ti-6242, which may have great potential for the future manufacturing of aerospace components. The bimetal Ti-6Al-4V/γ-TiAl was unsuccessfully built due to the intrinsic cold cracking of γ-TiAl processed by L-PBF. In comparison, the bimetal Ti-6Al-4V/Ti-6242 was successfully manufactured by L-PBF with a solid and defect-free interface.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Manufacturing
Liesbet Deconinck, Maria T. Villa Vidaller, Elena Bernardo Quejido, Eric A. Jaegle, Tom Depover, Kim Verbeken
Summary: This study investigates the hydrogen embrittlement of Ti-6Al-4V titanium alloy processed by different manufacturing methods. The susceptibility to hydrogen embrittlement is determined by the microstructure. In-situ electrochemical hydrogen charging tests and various analytical techniques are used to examine the mechanical characteristics and microstructural interactions with hydrogen. The presence of the beta phase increases the hydrogen uptake capacity and enhances the susceptibility to hydrogen embrittlement.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Manufacturing
Zhuoer Chen, Xinhua Wu, Chris H. J. Davies
Summary: This study demonstrates the use of surface roughness data as an evaluation tool for process variation in a commercial L-PBF machine, with factors like powder recoating, spatter generation, gas flow and heat transfer being identified as key contributors to intra-build quality inconsistency. Surface roughness was found to vary across build volume and progression, with strong impact from the orientation of inclined surfaces to the laser origin.
ADDITIVE MANUFACTURING
(2021)
Article
Engineering, Manufacturing
Thomas Achee, Gabe Guss, Alaa Elwany, Manyalibo Matthews
Summary: The study shows that the laser pre-sintering (LPS) method is most effective in the 1-4 J/mm(3) volumetric energy density processing regimes, minimizing the common experimentally observed problems with the LPBF process.
ADDITIVE MANUFACTURING
(2021)
Review
Engineering, Manufacturing
Lucas C. B. Carolo, Robert E. Cooper
Summary: This review examines the mechanisms and process variables that contribute to surface roughness in EB-PBF, focusing on the performance and quality of Ti-6Al-4V parts. The challenges in surface metrology and new perspectives for future research are also discussed.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
J. Chen, D. Fabijanic, T. Zhang, E. W. Lui, M. Brandt, W. Xu
Summary: It has been discovered that slow cooling from the beta phase field, at significantly reduced cooling rates (below 5 degrees Celsius per second), can result in the observed lamellar alpha + beta microstructure.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
J. Noronha, J. Rogers, M. Leary, E. Kyriakou, S. B. Inverarity, R. Das, M. Brandt, M. Qian
Summary: In this study, hollow-strut metal lattices were successfully fabricated using laser powder bed fusion (LPBF) additive manufacturing (AM). It was found that both face-centered cubic (FCC) and FCC with Z-struts (FCCZ) Ti-6Al-4V lattice topologies exhibited mechanical properties close to solid-strut metal lattices. Moreover, the fine prior-beta grains in the Ti-6Al-4V hollow-strut thin walls contributed positively to the superior mechanical properties.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Manufacturing
Ziheng Wu, Mohammadreza Asherloo, Runbo Jiang, Melody H. Delpazir, Nihal Sivakumar, Muktesh Paliwal, Joe Capone, Benjamin Gould, Anthony Rollett, Amir Mostafaei
Summary: Laser powder bed fusion is a dominant process in the additive manufacturing industry, and the study found that hydride-dehydride Ti-6Al-4 V powder can reduce costs and achieve nearly fully dense components. By optimizing process parameters, the in-part porosity can be controlled. Two porosity formation mechanisms were proposed and attributed to the unique characteristics of the HDH powder bed.
ADDITIVE MANUFACTURING
(2021)
Article
Automation & Control Systems
Nicole Emminghaus, Robert Bernhard, Joerg Hermsdorf, Stefan Kaierle
Summary: In laser-based powder bed fusion of metals, residual oxygen in the processing atmosphere is regarded as disruptive. This study proposes a novel approach using silane to eliminate residual oxygen and enhance flowability, without affecting the manufacturing process and component properties.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Lu Yang, Saranarayanan Ramachandran, Axieh Bagasol, Qiyu Guan, Weiguang Wang, David J. Browne, Denis Dowling, Wajira Mirihanage
Summary: Laser powder bed fusion (LPBF) technology enables the production of metallic components without conventional design and manufacturing constraints. By reconstructing the as-solidified microstructure across the LPBF build volume, the initial solidification microstructure of Ti-6Al-4V alloy can be revealed, providing insights into the early stages of solidification. This approach also has the potential to explore solidification microstructure and defect formation in titanium alloys during additive manufacturing.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Alireza Dareh Baghi, Shahrooz Nafisi, Heike Ebendorff-Heidepriem, Reza Ghomashchi
Summary: A detailed study comparing the microstructural differences between Ti-6Al-4V parts fabricated via conventional powder metallurgy and laser powder bed fusion routes revealed that L-PBF parts have a higher microhardness with a single phase of martensitic alpha '. On the other hand, parts sintered via powder metallurgy showed two phases with lower microhardness. The rapid cooling of the beta phase had no effect on the hardening of the bulk martensitic hcp alpha ' in L-PBF parts.
Article
Engineering, Industrial
Mustafa Kas, Oguzhan Yilmaz
Summary: This paper presents a design approach for producing uniform and graded porous structures using additive manufacturing, with experimental results showing that different porosity ranges and density ratios can be achieved by changing lattice strut thickness. Graded porous structures exhibit higher deformation and energy absorption capacities compared to uniform structures. The radial increase in strut density from inward to outward demonstrated a 6% improvement in specific compressive strength. The deformation mechanism and failure behavior of structures were strongly influenced by the porosity variation strategy.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Optics
Seungjong Lee, Zabihollah Ahmadi, Jonathan W. Pegues, Masoud Mahjouri-Samani, Nima Shamsaei
Summary: The study examines laser polishing as a post-processing method for additively manufactured metallic parts, showing that it can reduce surface roughness, improve high cycle fatigue life, and alleviate residual stresses through a secondary stress relief process, resulting in enhanced fatigue strength across all life regimes.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Materials Science, Coatings & Films
Yanchun Xie, Xiaodong Wang, Shenshen Cui, Jiali Hu, Yongcun Wei, Yi Lian, Anwu Xuan, Bin Yu, Erlin Zhang
Summary: In this study, Ti-xFe (x = 3,5,9 wt%) alloys were surface modified by micro-arc oxidation (MAO) to improve their antimicrobial properties and biocompatibility. The results showed that increasing the oxidation voltage greatly enhanced the roughness and hydrophilicity of Ti-xFe-MAO alloys. The Ti-xFe alloys micro-arc oxidized at 250 V and 300 V exhibited improved corrosion resistance and excellent antimicrobial and cytocompatibility properties, making them suitable for orthopedic implant materials.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Yuting Hao, Zuoyan Ye, Lili Wang, Minheng Ye, Hui Dong, Chao Wang, Yunchen Du
Summary: This study focuses on the modification of PEO coatings on Ta-12W alloy using NH4F additive. The results show that ultra-low porosity coatings can be prepared by optimizing the NH4F content. The formation process of specific structures on the coating surface is discussed, and the effects of NH4F concentration and treatment duration on coating characteristics are investigated.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Yuanzhuo Liu, Linjiang Chai, Tao Yang, Chaodan Hu, Chuanmei Wang, Guoqiang Xi
Summary: By employing a pulsed laser, laser cladding was performed on IN718 alloy pre-coated with CrCoNi-TiC/SiC powders and three defect-free coatings were successfully prepared. The addition of TiC and SiC powders generated fine carbides dispersed in the coatings and led to changes in grain and substructure morphologies, resulting in increased hardness and wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
M. Ghaemi, A. Lopez-Cazalilla, K. Sarakinos, G. J. Rosaz, C. P. A. Carlos, S. Leith, S. Calatroni, M. Himmerlich, F. Djurabekova
Summary: The use of high-power impulse magnetron sputtering can result in dense and uniform niobium films on all surfaces of superconducting rf cavities, as simulated and investigated in this study.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Jiaheng Du, Xinli Fan, Dongqin Xiao, Wuxiang Wang, Yiran Yin, Zhong Li, Kui He, Yanfei Tan, Jiyuan Yan, Gangli Liu, Ke Duan
Summary: This study investigated the electrophoretic deposition (EPD) of magnesium oxide (MgO) coatings on micro-arc oxidized titanium (MAO-Ti) and evaluated their in vitro antibacterial properties and biocompatibility. The results showed that MgO coatings significantly reduced bacterial numbers and biofilm formation, while also demonstrating good cytocompatibility and induction of osteoblast mineralization.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Samiksha Moharana, Yuichi Otsuka, R. Gnanamoorthy
Summary: The addition of titania to HAp coatings improves their wear resistance and reduces damage to titanium implants caused by debris generation. This study evaluates the fretting wear resistance of titania-added HAp suspension plasma spray coating and finds that it exhibits reduced friction coefficient and increased wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Li-Ping Wu
Summary: The functional hazenite coating deposited on AZ31 Mg alloy showed improved roughness and hydrophilicity, enhanced biocompatibility, reduced degradation rate, and decreased susceptibility to stress corrosion cracking.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Ning Tian, Delei Xu, Jinfei Wei, Bucheng Li, Junping Zhang
Summary: This study reports the preparation of a superhydrophobic and anti-bacterial fabric for face masks. The fabric exhibits high superhydrophobicity and excellent moisture resistance, enabling functionality effectiveness in cold weather conditions. The fabric also demonstrates remarkable anti-bacterial activity against E. coli, attributed to the synergistic effect of superhydrophobicity and embedded ZnO nanoparticles. This superhydrophobic anti-bacterial fabric holds great potential for various practical applications in personal protective equipment, healthcare, and disease prevention.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Katharina Beck, Anke S. Ulrich, Andreas K. Czerny, Emma M. H. White, Martin Heilmaier, Mathias C. Galetz
Summary: Refractory metal based alloys have great potential as structural materials for high-temperature applications due to their high melting points. However, they are prone to catastrophic oxidation at around 700 degrees C. This study investigated the effect of aluminium diffusion coatings on the oxidation resistance of pure molybdenum, niobium, tantalum, and tungsten. The results showed that the aluminization improved the oxidation behavior and decreased the oxide growth rate for molybdenum and tantalum.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Wenwen Shuai, Haijun Dou, Zhichen Guan, Wei Qian, Zhibao Li, Yinqun Hua, Jie Cai
Summary: This study synthesized (Y1-xLax)3Al5O12 (x = 0, 0.1, 0.2, 0.3) materials by doping lanthanum ions, and found that the doped materials exhibited improved mechanical properties and thermal expansion coefficient, as well as enhanced resistance to CMAS corrosion. These materials have potential applications.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Xianglei Liu, Jiahui Ding, Wanbo Hou, Xinhao Shi, Tao Feng, Xiangyuan Meng, Shifeng Wen, Mingde Tong, Zhufeng Yue
Summary: A composite coating was developed to improve the adhesion, wear resistance, and corrosion resistance, which exhibited significant enhancements in these properties.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Hongxuan Xing, Jidong Li, Xianwei Hu, Liang Tian, Renyun Zhang, Yiyong Wang
Summary: By depositing a Cu/Co-Mo corrosion-resistant plating layer on the surface of 6061 Al alloy, the bonding strength between the alloy and the plating layer can be improved and the corrosion resistance can be enhanced. The composite coating forms an obvious three-layer structure with Co-Mo coating exhibiting amorphous characteristics and Co3Mo phase composition. The composite coating improves the corrosion resistance and hardness of the substrate, effectively protecting the 6061 Al alloy.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Fan Yang, Debin Wang, Tianrun Li, Baijun Yang, Suode Zhang, Jianqiang Wang
Summary: The impact-corrosion behavior of monolayer and hierarchical Fe-based amorphous coatings fabricated by HVAF was investigated in 3.5 wt% NaCl solution. The monolayer coating exhibits corrosion failure with increased impact energy, while the hierarchical coating shows improved resistance. However, at high impact energies, both coatings experience corrosion degradation.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Shoaib Ahmad, Muddasir Nawaz, Solaiman Mohammad, R. A. Shakoor, Ramazan Kahraman, Talal Mohammed Al Tahtamouni
Summary: This research presents a novel self-healing anti-corrosion composite coating that demonstrates higher inhibition efficiency and self-healing effect, providing protection for metallic structures against corrosive environments.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Hui-Wen Peng, Chun-Hway Hsueh
Summary: A series of (CoCrNi)100-x-ySixNdy medium entropy alloy films with manipulated metalloid element, Si, and rare earth element, Nd, were synthesized using magnetron three-target co-sputtering. The films showed different structures and mechanical properties with varying Si and Nd contents. The optimized mechanical properties were observed in the film with Si0.61Nd5.14, attributed to precipitation strengthening and grain refinement.
SURFACE & COATINGS TECHNOLOGY
(2024)