/library/oar/handle/123456789/2066 2025-12-27T00:41:06Z /library/oar/handle/123456789/142086 Title: Pore-size-dependent mechanical properties and biodegradation behavior of biomedical Zn-Li alloy scaffolds Authors: Xin, Jie; Li, Qiang; Wang, Cheng; Chu, Chenglin; Xue, Feng; Yang, Youwen; Giordmaina, Ryan; Buhagiar, Joseph P.; Dong, Qiangsheng; Bai, Jing Abstract: Zn-Li alloys have emerged as promising candidates for bone repair applications due to their excellent mechanical properties and osteogenic potential. In this study, porous Zn-0.7Li scaffolds were fabricated via infiltration casting, with adjustable spherical pore sizes to achieve high porosity and thin-walled structures. Increasing pore size from 550 μm to 950 μm was accompanied by a corresponding elevation in scaffold porosity from 65.6 % to 71.2 % and a concurrent increase in the average wall thickness from 0.21 mm to 0.31 mm. Herein, the compressive yield strength decreased exponentially with rising porosity, while the degradation weight loss rate correlated linearly with specific surface area. The compressive yield strength of Zn-Li scaffolds were enhanced by solid solution strengthening and β-LiZn4 phase on the Zn matrix, superior to Zn-Mg alloy and pure Zn scaffolds at equivalent porosity. Besides, Zn-0.7Li scaffolds showed accelerated degradation due to their larger specific surface area. Based on the evolution of pore structure and mechanical properties during degradation, a mechanical performance decay model was established, which predicted the mechanical half-life of the Zn-0.7Li scaffolds as 61–122 days. This study provides insights into the quantitative relationship between pore structure and physicochemical properties of biodegradable bone repair materials, exploring feasible technical routes for developing high-performance scaffolds. 2025-01-01T00:00:00Z /library/oar/handle/123456789/141899 Title: Review on field assisted metal additive manufacturing Authors: Tan, Chaolin; Li, Runsheng; Su, Jinlong; Du, Dafan; Du, Yang; Attard, Bonnie; Chew, Youxiang; Zhang, Haiou; Lavernia, Enrique J.; Fautrelle, Yves; Teng, Jie; Dong, Anping Abstract: Additive manufacturing (AM) offers unprecedented design freedom and manufacturing flexibility for processing complex components. Despite the numerous advantages of AM over conventional manufacturing methods, there are still some issues and bottlenecks that hinder the wide-scale industrial adaptation of AM techniques. The emerging field-assisted additive manufacturing (FAAM) is a designation that combines different auxiliary energy fields (e.g., ultrasound, magnetism, etc.) to overcome limitations in AM by benefiting from the intrinsic advantages of auxiliary fields. This work provides an up-to-date and dedicated review of FAAM in metallic materials, assisted by mainstream auxiliary magnetic, acoustic, mechanical, and thermal fields, as well as some emerging fields. The work principle and interaction mechanism between the field and the deposited metallic materials are elucidated. FAAM processes simulation and modelling are also reviewed. The auxiliary fields can affect the melt pool convection and dynamics, alter the temperature profile and thermal history during material solidification and induce stress or plastic deformation to the deposited materials. Hence, the effects of the auxiliary fields on the melt pool dynamics, solidification kinetics, densification behaviour, microstructure and texture, mechanical properties and fatigue performance are reviewed and discussed in detail. The perspectives on the research gap and further development trends of FAAM are also discussed. 2023-01-01T00:00:00Z /library/oar/handle/123456789/141073 Title: Tribocorrosion response of PVD molybdenum nitride (MoN) coated Ti-6Al-4V Authors: Galea, Sarah; Dearnley, Peter A.; Mallia, Bertram Abstract: Ti-6Al-4V is a widely used biomedical alloy, valued for its biocompatibility, high corrosion resistance and mechanical strength. However, its poor tribological performance limits its use in frictional contacts. This limitation can be addressed by enhancing surface properties through coatings that impart enhanced degradation resistance. Molybdenum nitride (MoN) based coatings are promising candidates for bio-tribological use due to their ability to attain high hardness (~37 GPa), stemming from strong primary bonding. Moreover, even if small amounts of molybdenum ions are released, they are unlikely to elicit adverse biological effects due to the ability of the body to regulate molybdenum level through homeostatic processes. This study investigates the tribocorrosion performance of two MoN PVD coatings, deposited on Ti-6Al-4V substrates at different nitrogen partial pressures via unbalanced reactive magnetron sputtering. Electrochemical behaviour and tribocorrosion response were evaluated in Ringer’s solution under elastic contact conditions. A reciprocating sliding configuration against an alumina ball counterface was used and tribocorrosion tests were conducted under both open circuit potential and anodic potential conditions. The MoN coated Ti-6Al-4V variants exhibited a markedly reduced tribocorrosion material loss compared to the untreated alloy under both electrochemical conditions. The coatings exhibited resistance to blister formation and caused minimal damage to the counterface alumina ball during tribocorrosion testing 2025-01-01T00:00:00Z /library/oar/handle/123456789/140553 Title: A critical review of magnesium-based scaffolds for bone tissue engineering : properties, production methods, surface treatments, and multiscale evaluation techniques Authors: Chen, Dongfang; Xin, Jie; Yin, Ming; Xu, Man; Chen, Jiahao; Dong, Qiangsheng; Shao, Yi; Wang, Cheng; Chu, Chenglin; Xue, Feng; Yang, Youwen; Giordmaina, Ryan; Buhagiar, Joseph P.; Bai, Jing Abstract: Magnesium-based scaffolds have emerged as promising candidates for bone tissue engineering due to their biodegradability, mechanical compatibility, and osteoconductive property. However, their clinical translation hinges on addressing critical challenges in production, surface treatment, and evaluation. This article presents a systematically synthesized review of recent advancements and future directions across these domains. The findings show that current production methods, including melt processing, powder metallurgy, physical drilling, and additive manufacturing, offer distinct advantages in tailoring pore architecture but face difficulties in harmonizing the structural complexities, mechanical properties, degradation behaviors, and biological responses of scaffolds. Emerging hybrid preparation techniques have the potential to combine the principles and strengths of the aforementioned methods. Surface treatments using conventional coatings are affected by stress concentration effects and hydrogen bubble retention, which cause delamination and interfacial debonding. Surface engineering must prioritize self-healing and reconfigurable coatings that dynamically adapt to microenvironmental cues and thereby stabilize protective films. Traditional assessments fail to capture multiscale interplays, whereas organ-on-a-chip systems and spatially resolved local techniques offer transformative solutions. Advancements in hybrid preparations, self-healing coatings, and multiscale evaluation techniques can overcome the inherent complexities of porous architectures and thus position Mg-based scaffolds as next-generation solutions for orthopedic applications. 2025-01-01T00:00:00Z