Article
Materials Science, Ceramics
Andre Gouws, Deborah Hagen, Alex Chen, Erofili Kardoulaki, Joseph J. Beaman, Desiderio Kovar
Summary: Flash sintering is a rapid densification method for ceramics that combines heating and electric fields, and can be initiated using a scanning laser. In addition to YSZ, AlN is shown to undergo selective laser flash sintering, with initiation governed by local input energy density and heat dissipation.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Xiao Chen, Jie Yin, Xuejian Liu, Bingbing Pei, Jian Huang, Xinglin Peng, Aidong Xia, Longzhi Huang, Zhengren Huang
Summary: A novel strategy for fabricating SiC composites via selective laser sintering (SLS) of carbon fiber combined with liquid silicon infiltration is reported. The SLS-powder composed of chopped carbon fiber and phenolic resin mixed powder is used to obtain a green body with a tailored microstructure. High-performance SiC composites with optimized density, flexural strength, elastic modulus, and fracture toughness are prepared through liquid silicon infiltration.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Kejie Wang, Chonggao Bao, Chengyu Zhang, Yinghong Li, Rongzhen Liu, HaiMan Xu, Haiqiang Ma, Jiyou Man, Suocheng Song
Summary: By adding sintering aids and utilizing the CIP process, the bending strength of Si3N4 ceramics can be significantly enhanced, resulting in the optimal performance of the ceramics.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Kejie Wang, Chonggao Bao, Chengyu Zhang, Yinghong Li, Rongzhen Liu, HaiMan Xu, Haiqiang Ma, Jiyou Man, Suocheng Song
Summary: The bending strength of SLS Si3N4 ceramics can be greatly improved by adding sintering aids between Si3N4 granules and by CIP after debinding. Optimal performance of ceramics is obtained by CIP after debinding and the use of inter-granule sintering aids.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Adam B. Peters, Dajie Zhang, Alberto Hernandez, Chuhong Wang, Dennis C. Nagle, Tim Mueller, James B. Spicer
Summary: Selective laser reaction sintering techniques were used to produce near netshape non-oxide ceramics including SiC, Si3N4, and HfC/SiC composites. In-situ reactions during laser processing and layer formation were utilized to produce reaction bonded layers of covalent ceramics. Different precursor materials composed of metal and/or metal oxide powders were converted to non-oxide ceramic layers by simultaneous chemical conversion and local interparticle bonding. The results showed the feasibility of producing near net-shape SiC and SiC composites through single-step additive manufacturing compatible techniques.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Manufacturing
Wen Zheng, Jia-Min Wu, Shuang Chen, Kang-Bo Yu, Shuai-Bin Hua, Chen-Hui Li, Jing-Xian Zhang, Yu-Sheng Shi
Summary: Silica-based ceramic cores with excellent mechanical properties and chemical stability are widely used for manufacturing aero-engine hollow blades. This study combined SLS with VI to fabricate silica-based ceramic cores and investigated the influence of laser processing parameters and infiltration times on their mechanical properties. Optimal SLS processing parameters were determined, and the room temperature flexural strength and linear shrinkage of the ceramics were improved with increased infiltration time.
ADDITIVE MANUFACTURING
(2021)
Article
Chemistry, Physical
Debajyoti Bhaduri, Tina Ghara, Pavel Penchev, Soumitra Paul, Catalin Pruncu, Stefan Dimov, David Morgan
Summary: A novel LP strategy was proposed to improve the re-melting of aluminium alloys by introducing a thermally insulating ceramic baseplate, resulting in significant reductions in surface roughness and residual stresses. The study highlights the importance of controlling heat dissipation in laser polishing of thermally conductive materials to achieve desired surface integrity properties.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Manufacturing
Adam B. Peters, Dajie Zhang, Alberto Hernandez, Michael C. Brupbacher, Dennis C. Nagle, Tim Mueller, James B. Spicer
Summary: Selective laser reaction sintering techniques were used to produce near net-shape non-oxide ceramic materials, such as carbides and nitrides, which were previously incompatible with powder-bed fusion additive manufacturing methodologies. By optimizing precursor formulations and processing parameters, undistorted, crack-free refractory ceramic layers were successfully fabricated with sub-millimeter spatial resolution. The results demonstrate the potential of SLRS for producing near net-shape carbides and nitrides, suggesting compatibility with additive manufacturing processes.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Ceramics
C. Gomez-Rodriguez, L. Garcia-Quinonez, L. F. Verdeja, G. A. Castillo-Rodriguez, J. A. Aguilar-Martinez, A. E. Marino-Gamez, D. Fernandez-Gonzalez
Summary: Alumina/molybdenum nanocomposites were successfully synthesized and sintered using a CO2 laser. The distribution of metallic molybdenum particles at triple points and grain boundaries in the alumina matrix plays a crucial role in promoting densification and affecting the microstructural evolution of the composite during sintering.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Deborah Hagen, Joseph J. Beaman, Desiderio Kovar
Summary: Selective laser flash sintering (SLFS) is a flash sintering variation that utilizes a scanning laser as the only external heat source. This study focuses on understanding the charge transport mechanisms during stage I SLFS in yttria stabilized zirconia. Experimental results show that both a discrete bundle of charges and continuous flow of charge carriers contribute to the current at the initiation of SLFS.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Xiang Zhang, Fei Wang, Zhipeng Wu, Yongfeng Lu, Xueliang Yan, Michael Nastasi, Yan Chen, Yifei Hao, Xia Hong, Bai Cui
Summary: By combining a direct selective laser sintering process with a laser preheating procedure, the temperature gradient and thermal stress were reduced, leading to the successful additive manufacturing of BaTiO3 ceramics. The resulting h-BaTiO3 layer showed high relative density, absence of pores or microcracks, and a Vickers hardness 70% higher than conventionally sintered t-BaTiO3 ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Rubina Ajdary, Niklas Kretzschmar, Hossein Baniasadi, Jon Trifol, Jukka Seppala, Jouni Partanen, Orlando J. Rojas
Summary: In the study, lignin was introduced as a suitable component for selective laser sintering (SLS) of polyamide (PA12) to reduce costs while maintaining or improving processability and performance. The addition of lignin in SLS resulted in composite material with improved thermal stability and mechanical properties, while also influencing the surface properties and wettability of the structures. The research demonstrated the potential of lignin valorization in composites through SLS, allowing for reduced cost, scalability, and easy processing.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Materials Science, Ceramics
Xiao Geng, Yuzhe Hong, Jincheng Lei, Jianxing Ma, Jie Chen, Hai Xiao, Jianhua Tong, Rajendra K. Bordia, Fei Peng
Summary: This paper reports an ultra-fast sintering phenomenon of alumina achieved through scanning laser irradiation. The study found that alumina can be sintered to high density in a short time using laser scanning, with a different microstructure compared to furnace-sintered alumina. The grain size and relative density of laser-sintered alumina vary from the center to the edge of the laser beam, and the sintering mechanism is affected by the laser scanning speed.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Optics
Yueqiang Yu, Minzheng Jiang, Suling Wang, Yanling Guo, Ting Jiang, Ziming Zheng, Shuaiqi Huang, Tianqi Cui, Kun Sha
Summary: The study focuses on the structural morphology and dynamic evolution process of sintering pool during the SLS process of WSPC powder. By comparing numerical simulation with experimental results, the law of sintering pool size changing with process parameters was obtained.
OPTICS AND LASER TECHNOLOGY
(2021)
Review
Chemistry, Multidisciplinary
Huijae Park, Jung Jae Park, Phuong-Danh Bui, Hyeokjun Yoon, Costas P. Grigoropoulos, Daeho Lee, Seung Hwan Ko
Summary: The connection between laser-based material processing and additive manufacturing is deeply rooted. Laser can selectively solidify materials for additive manufacturing, allowing for customizability. Laser-based material processing is extensively studied and applied in manufacturing functional components with unique shapes or complex patterns.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Y. Liu, K. Zweiacker, C. Liu, J. T. McKeown, J. M. K. Wiezorek
Summary: The evolution of rapid solidification microstructure and solidification interface velocity of hypereutectic Al-20at.%Cu alloy after laser melting has been studied experimentally. It was found that the formation of microstructure was dominated by eutectic, alpha-cell, and banded morphology grains, and the growth modes changed with increasing interface velocity.
Article
Materials Science, Multidisciplinary
Bharat Gwalani, Julian Escobar, Miao Song, Jonova Thomas, Joshua Silverstein, Andrew Chihpin Chuang, Dileep Singh, Michael P. Brady, Yukinori Yamamoto, Thomas R. Watkins, Arun Devaraj
Summary: Castable alumina forming austenitic alloys exhibit superior creep life and oxidation resistance at high temperatures. This study reveals the mechanism behind the enhanced creep performance of these alloys by suppressing primary carbide formation and offers a promising alloy design strategy for high-temperature applications.
Article
Materials Science, Multidisciplinary
Jian Song, Qi Zhang, Songsong Yao, Kunming Yang, Houyu Ma, Jiamiao Ni, Boan Zhong, Yue Liu, Jian Wang, Tongxiang Fan
Summary: Recent studies have shown that achieving an atomically flat surface for metals can greatly improve their oxidation resistance and enhance their electronic-optical applications. Researchers have explored the use of graphene as a covering layer to achieve atomically flat surfaces. They found that high-temperature deposited graphene on copper surfaces formed mono-atomic steps, while annealed copper and transferred graphene on copper interfaces formed multi-atomic steps.
Article
Materials Science, Multidisciplinary
Jennifer A. Glerum, Jon-Erik Mogonye, David C. Dunand
Summary: Elemental powders of Al, Ti, Sc, and Zr are blended and processed via laser powder-bed fusion to create binary and ternary alloys. The microstructural analysis and mechanical testing show that the addition of Ti results in the formation of primary precipitates, while the addition of Sc and Zr leads to the formation of fine grain bands. The Al-0.25Ti-0.25Zr alloy exhibits comparable strain rates to Al-0.5Zr at low stresses, but significantly higher strain rates at higher stresses during compressive creep testing. Finite element modeling suggests that the connectivity of coarse and fine grain regions is a critical factor affecting the creep resistance of the alloys.
Article
Materials Science, Multidisciplinary
P. Jannotti, B. C. Hornbuckle, J. T. Lloyd, N. Lorenzo, M. Aniska, T. L. Luckenbaugh, A. J. Roberts, A. Giri, K. A. Darling
Summary: This work characterizes the thermo-mechanical behavior of bulk nanocrystalline Cu-Ta alloys under extreme conditions. The experiments reveal that the alloys exhibit unique mechanical properties, behaving differently from conventional nanocrystalline Cu. They do not undergo grain coarsening during extrusion and exhibit behavior similar to coarse-grained Cu.
Article
Materials Science, Multidisciplinary
Yiqing Wei, Jingwei Li, Daliang Zhang, Bin Zhang, Zizhen Zhou, Guang Han, Guoyu Wang, Carmelo Prestipino, Pierric Lemoine, Emmanuel Guilmeau, Xu Lu, Xiaoyuan Zhou
Summary: This study proposes a new strategy to modify microstructure by phase regulation, which can simultaneously enhance carrier mobility and reduce lattice thermal conductivity. The addition of Cu in layered SnSe2 induces a phase transition that leads to increased grain size and reduced stacking fault density, resulting in improved carrier mobility and lower lattice thermal conductivity.
Article
Materials Science, Multidisciplinary
Jia Chen, Zhengyu Zhang, Eitan Hershkovitz, Jonathan Poplawsky, Raja Shekar Bhupal Dandu, Chang-Yu Hung, Wenbo Wang, Yi Yao, Lin Li, Hongliang Xin, Honggyu Kim, Wenjun Cai
Summary: In this study, the structural origin of the pH-dependent repassivation mechanisms in multi-principal element alloys (MPEA) was investigated using surface characterization and computational simulations. It was found that selective oxidation in acidic to neutral solutions leads to enhanced nickel enrichment on the surface, resulting in reduced repassivation capability and corrosion resistance.
Article
Materials Science, Multidisciplinary
X. Y. Xu, C. P. Huang, H. Y. Wang, Y. Z. Li, M. X. Huang
Summary: The limited slip systems of magnesium (Mg) and its alloys hinder their wide applications. By conducting tensile straining experiments, researchers discovered a rate-dependent transition in the dislocation mechanisms of Mg alloys. At high strain rates, glissile dislocations dominate, while easy-glide dislocations dominate at low strain rates. Abundant glissile dislocations do not necessarily improve ductility.
Article
Materials Science, Multidisciplinary
M. S. Szczerba, M. J. Szczerba
Summary: Inverse temperature dependences of the detwinning stress were observed in face-centered cubic deformation twins in Cu-8at.%Al alloy. The detwinning stress increased with temperature when the pi detwinning mode was involved, but decreased when the pi/3 mode was involved. The dual effect of temperature on the detwinning stress was due to the reduction of internal stresses pre-existing within the deformation twins. The complete reduction of internal stresses at about 530 degrees C led to the equivalence of the critical stresses of different detwinning modes and a decrease in the yield stress anisotropy of the twin/matrix structure.
Article
Materials Science, Multidisciplinary
Taowen Dong, Tingting Qin, Wei Zhang, Yaowen Zhang, Zhuoran Feng, Yuxiang Gao, Zhongyu Pan, Zixiang Xia, Yan Wang, Chunming Yang, Peng Wang, Weitao Zheng
Summary: The interaction between the electrode and the electric double layer (EDL) significantly influences the energy storage mechanism. By studying the popular alpha-Fe2O3 electrode and the EDL interaction, we find that the energy storage mechanism of the electrode can be controlled by modulating the EDL.
Article
Materials Science, Multidisciplinary
Matthew R. Barnett, Jun Wang, Sitarama R. Kada, Alban de Vaucorbeil, Andrew Stevenson, Marc Fivel, Peter A. Lynch
Summary: The elastic-plastic transition in magnesium alloy Mg-4.5Zn exhibits bursts of deformation, which are characterized by sudden changes in grain orientation. These bursts occur in a coordinated manner among nearby grains, with the highest burst rate observed at the onset of full plasticity. The most significant burst events are associated with twinning, supported by the observation of twinned structures using electron microscopy. The bursts are often preceded and followed by a stasis in peak movement, indicating a certain "birth size" for twins upon formation and subsequent growth at a later stage.
Article
Materials Science, Multidisciplinary
Vaidehi Menon, Sambit Das, Vikram Gavini, Liang Qi
Summary: Understanding solute segregation thermodynamics is crucial for investigating grain boundary properties. The spectral approach and thermodynamic integration methods can be used to predict solute segregation behavior at grain boundaries and compare with experimental observations, thus aiding in alloy design and performance control.
Article
Materials Science, Multidisciplinary
Feiyu Qin, Lei Hu, Yingcai Zhu, Yuki Sakai, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Yue-Wen Fang, Jun Sun, Xiangdong Ding, Masaki Azuma
Summary: This study reports on the negative and zero thermal expansion properties of Cd2Re2O7 and Cd1.95Ni0.05Re2O7 materials, along with their ultra-low thermal conductivity. Through investigations of their structures and phonon calculations, the synergistic effect of local structure distortion and soft phonons is revealed as the key to achieving these distinctive properties.
Article
Materials Science, Multidisciplinary
Thomas Beerli, Christian C. Roth, Dirk Mohr
Summary: A novel testing system for miniature specimens is designed to characterize the plastic response of materials for which conventional full-size specimens cannot be extracted. The system has an automated operation process, which reduces the damage to specimens caused by manual handling and improves the stability of the test results. The experiments show that the miniature specimens extracted from stainless steel and aluminum have high reproducibility, and the results are consistent with those of conventional-sized specimens. A correction procedure is provided to consider the influence of surface roughness and heat-affected zone caused by wire EDM.
Article
Materials Science, Multidisciplinary
Rani Mary Joy, Paulius Pobedinskas, Nina Baule, Shengyuan Bai, Daen Jannis, Nicolas Gauquelin, Marie-Amandine Pinault-Thaury, Francois Jomard, Kamatchi Jothiramalingam Sankaran, Rozita Rouzbahani, Fernando Lloret, Derese Desta, Jan D'Haen, Johan Verbeeck, Michael Frank Becker, Ken Haenen
Summary: This study investigates the influence of film microstructure and composition on the Young's modulus and residual stress in nanocrystalline diamond thin films. The results provide insights into the mechanical properties and intrinsic stress sources of these films, and demonstrate the potential for producing high-quality nanocrystalline diamond films under certain conditions.