Article
Engineering, Manufacturing
Lorna Sinclair, Samuel J. Clark, Yunhui Chen, Sebastian Marussi, Saurabh Shah, Oxana Magdysyuk, Robert C. Atwood, Gavin J. Baxter, Martyn Jones, D. Graham McCartney, Chu Lun Alex Leung, Peter D. Lee
Summary: During DED manufacturing, sintering of titanium alloy powders can occur outside the melt pool. High laser power or increased stage traverse speed can reduce detrimental sintering, but at the expense of deposition layer thickness. The mechanism of sinter formation is determined to be inflight heating of powder particles in the laser beam.
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE
(2022)
Article
Automation & Control Systems
Rong Zhao, Andrii Shmatok, Ralf D. Fischer, Barton C. Prorok
Summary: This study develops an accurate model using XCT technology and statistical analysis software to predict the optimal parameter sets and ranges for laser powder bed fusion. The study finds a numerical linear relationship between laser velocity and hatch spacing with laser power, which allows for minimizing porosity within a specific range. Thermodynamic calculations and experimental verification show that the lowest porosity at the optimum laser power range is associated with a specific line energy input.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Ercan Cakmak, Philip Bingham, Ross W. Cunningham, Anthony D. Rollett, Xianghui Xiao, Ryan R. Dehoff
Summary: This study focuses on the non-destructive characterization of additively manufactured parts using x-ray computed tomography. It compares laboratory XCT and synchrotron-based XCT, concluding that laboratory XCT is a compelling alternative for static defect characterization in AM parts, while synchrotron-based techniques offer unmatched performance for dynamic and sub-micron studies.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
N. Resnina, I. A. Palani, S. Belyaev, S. S. Mani Prabu, P. Liulchak, U. Karaseva, M. Manikandan, S. Jayachandran, V Bryukhanova, Anshu Sahu, R. Bikbaev
Summary: The study utilized GMAW and WAAM processes to deposit NiTi alloy on a Titanium substrate, evaluating the heterogeneity in terms of microstructure and composition across different layers, and analyzing its influence on martensitic transformation temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Manufacturing
I Ponikarova, I. A. Palani, P. Liulchak, N. Resnina, S. Singh, S. Belyaev, S. S. Mani Prabu, S. Jayachandran, V Kalganov, Anshu Sahu, R. Bikbaev, U. Karaseva
Summary: The study found that the substrate and arc voltage have significant influence on the structure and functional properties of NiTi shape memory alloy produced by wire arc additive manufacturing. Ni-rich NiTi walls deposited on a Ti substrate demonstrated shape memory behavior at high temperatures, while NiTi samples deposited on a steel substrate were completely suppressed in martensitic transformation and shape memory effects due to high Fe concentration. Increasing arc voltage impacted the volume fraction of Ti2Ni precipitates, leading to decreased strain and increased likelihood of crack formation during deformation.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Materials Science, Multidisciplinary
Bo Yuan, Jinguo Ge, Hongjun Chen, Jiangang Pan, Liang Zhang, Xiaozhi Qi
Summary: In this study, NiTiFe shape memory alloy was successfully fabricated using low-cost mixed powder feedstocks and laser powder bed fusion technique. The printability and microstructure of the alloy could be adjusted by manufacturing process parameters.
Article
Engineering, Manufacturing
Massimiliano Ferrucci, Tom Craeghs, Sven Cornelissen, Michele Pavan, Wim Dewulf, Alkan Donmez
Summary: This study investigates the concept of incorporating inclined, cylindrical protrusions as reference fiducials in the design of cylindrical AM test coupons and built six coupons with proposed fiducials. Dimensional measurements reveal shortcomings in the fiducial design, mainly due to limited dimensional fidelity of small features by AM, but also suggest improvements for the design.
ADDITIVE MANUFACTURING
(2021)
Article
Engineering, Mechanical
Aditya Pandey, Vidit Gaur
Summary: This research studied the effect of inter-layer dwell time and fabrication path strategy on the fatigue properties of wire-arc additively manufactured (WAAM) IN718 alloy. The results showed that the bidirectional fabrication strategy improved mechanical properties compared to the uni-directional strategy. Increasing the dwell time improved the quality of the fabricated part and also improved mechanical properties. Fatigue lives were higher at higher dwell times due to fewer porosities. The observed effects were attributed to reduced heat accumulation, porosities, and residual stresses at higher dwell times.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Mohammadreza Nematollahi, Keyvan Safaei, Parisa Bayati, Mohammad Elahinia
Summary: In addition to fabricating complex geometries, additive manufacturing can tailor the microstructure and properties of parts. This study investigated the fabrication of functionally graded NiTi using selective laser melting, resulting in parts with different functional properties using two sets of process parameters. Several characterization methods were used to study microstructural distribution, showing a novel behavior with a combination of superelastic and shape memory effects at room temperature.
Article
Materials Science, Ceramics
Govind Kumar Mishra, Christ Prakash Paul, Arun Kumar Rai, Ashish Kumar Agrawal, Sanjay Kumar Rai, Kushvinder Singh Bindra
Summary: This study investigates the effects of various processing parameters on building Al2O3 ceramic structures using the LAM-DED technique. It was found that higher laser power led to greater relative density and fewer defects in structures built on Ti-6Al-4V substrate. Additionally, different scanning strategies played a crucial role in determining the density and defect structure of the built Al2O3 components.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Mohammadreza Nematollahi, Sayed Ehsan Saghaian, Keyvan Safaei, Parisa Bayati, Paola Bassani, Carlo Biffi, Ausonio Tuissi, Haluk Karaca, Mohammad Elahinia
Summary: This study investigates the microstructure and shape memory properties of laser powder bed fusion NiTi parts fabricated in different building orientations. The research reveals that different orientations lead to anisotropic compression-tension behaviors, with texture variations impacting the mechanical performance of the samples.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Manufacturing
Majid Laleh, Anthony E. Hughes, Sam Yang, Jiangting Wang, Jianli Li, A. Matt Glenn, Wei Xu, Mike Y. Tan
Summary: Additive manufacturing has advantages in producing metallic parts, but defect formation remains a challenge. This study used electron microscopy and X-ray CT to reveal new insights into lack-of-fusion (LOF) pores, showing their complex structures and formation mechanisms. Spatter particles are the main source of LOF structures, which can only be eliminated by careful selection of processing parameters.
ADDITIVE MANUFACTURING
(2021)
Article
Chemistry, Multidisciplinary
Yinglun Hong, Itxaso Azcune, Alaitz Rekondo, Tianhui Jiang, Shitong Zhou, Tristan Lowe, Eduardo Saiz
Summary: This study developed printable ink formulations for direct ink writing of epoxy vitrimer-based composites, using hexagonal boron nitride platelets to enhance fracture resistance and thermal conductivity through alignment during the printing process.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Manufacturing
Chuyuan Zheng, Amir Mostafaei, Pierangeli Rodriguez de Vecchis, Ian Nettleship, Markus Chmielus
Summary: Binder jet 3D printing is faster and less prone to residual stresses compared to beam-based melting methods, but often results in remnant porosity. This study used gas atomized nickel-based superalloy powders with different particle size distributions for binder jet printing and subsequent sintering. Supersolidus liquid phase sintering was found to facilitate particle rearrangement, resulting in a homogeneous microstructure and achieving final densities above 99%.
ADDITIVE MANUFACTURING
(2021)
Article
Engineering, Manufacturing
Mohammadreza Asherloo, Ziheng Wu, Melody H. Delpazir, Eyob Ghebreiesus, Sara Fryzlewicz, Runbo Jiang, Benjamin Gould, Mike Heim, Dave Nelson, Mike Marucci, Muktesh Paliwal, Anthony D. Rollett, Amir Mostafaei
Summary: This study compares the performance of HDH Ti-6Al-4V powders with different size distributions and reveals that a suitable combination of laser power-velocity-hatch spacing can achieve part production with a relative density of > 99.5%. Analysis shows that the lower packing density of coarse powder and high keyhole fluctuation result in higher proportions of porosity within builds during the LB-PBF process.
ADDITIVE MANUFACTURING
(2022)
Review
Materials Science, Multidisciplinary
Jaclyn L. Cann, Anthony De Luca, David C. Dunand, David Dye, Daniel B. Miracle, Hyun Seok Oh, Elsa A. Olivetti, Tresa M. Pollock, Warren J. Poole, Rui Yang, C. Cem Tasan
Summary: Exciting metallurgical breakthroughs in recent decades have ushered in a new era in metals design, with the urgent need for new metallic materials to address current engineering challenges. While the environmental impact of the metallurgical industry is significant, the design of new metallic materials with improved properties can help tackle key environmental challenges.
PROGRESS IN MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Muath M. Al Malki, Xun Shi, Pengfei Qiu, G. Jeffrey Snyder, David C. Dunand
Summary: The n-type Skutterudite alloy Yb0.3Co4Sb12 exhibits plastic deformation and creep characteristics under compressive stress at 500 degrees C, showing a moderate creep resistance. The study results indicate that Yb0.3Co4Sb12 can withstand certain pressures and maintain ductility at 500 degrees C, but a decrease in electrical conductivity leads to a slight reduction in its thermoelectric performance.
JOURNAL OF MATERIOMICS
(2021)
Article
Nanoscience & Nanotechnology
Shipeng Shu, Anthony De Luca, David C. Dunand, David N. Seidman
Summary: Micro-additions of 0.25 at.% Mn and/or 0.10 at.% Mo to dilute Al-0.08Zr-0.014Sc-0.008Er-0.09Si alloys affect precipitate evolution and resulting strengths, providing solid-solution strengthening and improving ambient-temperature strength and elevated-temperature creep resistance. Mn-modified precipitates exhibit higher number density, while Mo-modified precipitates display improved coarsening-resistance. Both Mn and Mo additions enhance creep resistance at 300 degrees C, with Mn-bearing alloys showing a more significant effect.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Anthony De Luca, Christoph Kenel, Seth Griffiths, Shreyas S. Joglekar, Christian Leinenbach, David C. Dunand
Summary: Additive manufacturing of non-weldable high-gamma' Ni base superalloys faces challenges due to their inherent cracking propensity. The segregation of melting point-depressant elements to grain boundaries drastically increases the solidification interval and leads to solid-state cracking at high-angle GBs. The study found that Ti, Cr, and Al segregate to solidification cell boundaries, while the formation of oxide and sulfide precipitates influences the alloy performance.
MATERIALS & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Hyeji Park, Heeman Choe, David C. Dunand
Summary: Cobalt-based superalloy microlattices with gamma/gamma ' microstructure are manufactured using ink-extrusion 3D-printing and pack-cementation surface alloying. The resulting microlattices exhibit superior mechanical properties compared to unalloyed Co microlattices, with enhanced compressive strength, ductility, and energy absorption.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Arun J. Bhattacharjee, Aaron R. Yost, Dinc Erdeniz, David C. Dunand, Ashley E. Paz Y. Puente
Summary: In-situ and ex-situ X-ray 3D-tomography were used to characterize the microstructure of Ni microwires before and after Ti deposition and homogenization process. The study found that imbalanced diffusion of Ni and Ti led to the formation of concentric shells of different intermetallic phases and Kirkendall porosity, resulting in the formation of NiTi microtubes or a single hollow channel near the central axis.
Article
Chemistry, Physical
S. Moser, C. Kenel, L. A. Wehner, R. Spolenak, D. C. Dunand
Summary: 3D printing and sintering were used to fabricate porous Si scaffolds for lithium-ion batteries, with a hierarchically-porous architecture created to accommodate volume changes during (dis)charging. The influence of sintering parameters on Si strut porosity and resulting properties was studied, showing that optimal performance is achieved at around -50% Si strut porosity.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Multidisciplinary
Luke C. O. Prestowitz, Sahin Coskun, Xiaobing Hu, David C. Dunand, Jiaxing Huang
Summary: The study demonstrates a bottom-up process using silver nanowires as a model system to successfully generate bulk nanostructured metal. Electroplating copper on the nanowires before hot pressing to increase densification, ultimately achieving cohesive bulk metal after hot pressing.
Article
Materials Science, Multidisciplinary
Dingchang Zhang, Christoph Kenel, David C. Dunand
Summary: Liquid ink-printing followed by sintering is used to fabricate WC-Co microlattices and cutting tools. The microstructure and hardness of WC-xCo are studied for different carbide-to-binder ratios and sintering temperatures, with an emphasis on the effects of Co content on densification and mechanical properties. The study also demonstrates the infiltration of Cu into WC-Co lattices to form dense composites with improved thermal conductivity and ductility for cutting tool applications.
Article
Materials Science, Multidisciplinary
C. Kenel, M. M. F. Al Malki, D. C. Dunand
Summary: This study explores the feasibility of synthesizing thermoelectric materials from oxide precursors, which has the potential to simplify the processing chain and reduce costs to obtain 3D-extruded thermoelectric parts with complex shapes and architectures.
Article
Nanoscience & Nanotechnology
Tiffany Wu, A. Plotkowski, A. Shyam, David C. Dunand
Summary: This study investigates the microstructures, thermal stability, ambient temperature strengthening, and creep resistance of three ternary Al-Ce-Ni alloys. The results show that the high volume fraction of intermetallic phases and extremely fine eutectic spacing/fiber diameter contribute to high ambient strengthening and enhanced creep resistance. The alloys also exhibit coarsening resistance up to 425 degrees C and remain substantial creep resistance at 300 degrees C, making them excellent materials for high temperature applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Daniel F. T. Rosenthal, David C. Dunand
Summary: Finite element modeling is utilized to simulate the secondary creep rate of alloys with inhomogeneous distribution of nano-precipitates within dendritic microstructures. The geometry and loading direction of dendrites have a significant impact on the alloy's creep behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Anthony De Luca, Christoph Kenel, Joanna Pado, Shreyas S. Joglekar, David C. Dunand, Christian Leinenbach
Summary: The post-processing treatment response of a Y2O3 oxide-dispersion-strengthened (ODS) and gamma/gamma'-strengthened Ni-8Cr-5.5Al-1Ti model alloy obtained via laser powder bed fusion (L-PBF) was studied. The dispersoid grains boundary pinning during the solutionizing treatment affects the recrystallization efficiency, leaving behind pockets of fine grains between large grains with complex shapes. Furthermore, the dispersoids exhibit excellent coarsening resistance during solutionizing and remain stable during subsequent aging heat treatments. Additionally, hot isostatic pressing (HIP) can significantly widen the L-PBF processing window of the alloy by closing and healing cracks under various consolidation parameters.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Manufacturing
Christoph Kenel, Anthony De Luca, Shreyas S. Joglekar, Christian Leinenbach, David C. Dunand
Summary: The study focuses on the successful synthesis of oxide-dispersion-strengthened alloys using laser powder bed fusion, emphasizing the interaction between oxide dispersoids and the metallic melt pool. By analyzing the behavior of Y2O3 nanoparticles in a Ni-8Cr-5.5Al-1Ti alloy, the critical role of Al in reacting with oxide nanodispersoids during the manufacturing process is discussed, along with suggestions for potentially more successful dispersoids types.
ADDITIVE MANUFACTURING
(2021)
Proceedings Paper
Electrochemistry
Amir R. Farkoosh, David N. Seidman, David C. Dunand
Summary: Commercial aluminum alloys have limitations in usage above 250 degrees C due to the coarsening/dissolution of their fine strengthening precipitates. However, L1(2)-strengthened alloys have better coarsening resistance at high temperatures. A new class of L1(2)-strengthed aluminum alloys based on the Al-Mn-Zr-Er system shows exceptional creep and coarsening resistance at 300 degrees C, as studied through microstructure analysis and compression creep experiments.
LIGHT METALS 2021, 50TH EDITION
(2021)
Article
Chemistry, Physical
M. H. Abbasi, R. Tavakoli, S. G. Shabestari
Summary: The correlation between atomic-scale structure and glass-forming ability of ternary bulk metallic glasses was investigated using molecular dynamics simulation. It was found that the potential energy of the icosahedra reflects the geometric ordering, while the virial stress energy density reveals the chemical ordering. Based on this discovery, a new prediction criterion for glass-forming ability was proposed and validated using experimental data.
Article
Chemistry, Physical
Haimin Zhai, Shuai Cui, Sheng Li, Dongqing He, Bo Cheng, Xinjian Zhang, Wensheng Li, Zhornik Viktor, Uladzimir Seniuts
Summary: Laser shock peening (LSP) treatment significantly affects the phase structure and properties of titanium-based BMG materials, promoting rejuvenation and introducing heterogeneity. This leads to improved plasticity and resistance to crack propagation. LSP-1 specimen exhibits higher hardness and plasticity, reducing fatigue peeling wear caused by brittleness. However, excessive LSP results in increased susceptibility to pitting and significantly reduces tribocorrosion resistance.
Article
Chemistry, Physical
Olga A. Blatova, Maria A. Solodovnikova, Ekaterina M. Egorova, Vladislav A. Blatov
Summary: This study applied a universal geometrical-topological approach to analyze the crystal structures of intermetallic compounds deposited in the Inorganic Crystal Structure Database. By exploring the local atomic configurations, they identified different types of coordination polyhedra and proposed criteria for determining geometric instability. This research provides useful indicators for checking crystallographic information and validating structural models.
Article
Chemistry, Physical
Jose M. Torralba, Diego Iriarte, Damien Tourret, Alberto Meza
Summary: The amount of globally recycled e-waste is less than 20% of the total produced. One of the causes for this low recycling rate is the complex and expensive selective sorting of metals. However, recent research has shown that high entropy alloys (HEAs) can be made from complex alloy mixtures, reducing the dependence on pure critical metals. It has been demonstrated that e-waste can be used to produce competitive HEAs.
Article
Chemistry, Physical
M. Y. He, Y. F. Shen, N. Jia, W. Y. Xue, J. P. Li
Summary: This study successfully improved the mechanical properties of high-entropy alloys (HEAs) through phase decomposition modulation, achieving strengthening of low-cost CuFeMnNi HEAs. The annealed HEAs exhibited excellent mechanical properties, with significantly increased yield strength and maintained satisfactory elongation.
Article
Chemistry, Physical
D. V. Louzguine-Luzgin, F. R. Pratama
Summary: In this study, the growth rate of a crystalline phase in the Al-Fe-Mn-Si metallic glass was measured in real time using transmission electron microscopy. The effective diffusion coefficient related to the slowest diffusing element (Mn) was estimated. The results showed that the growth rate of the crystalline phase was significantly faster compared to pure Al and AlFe compound.
Article
Chemistry, Physical
Zhenhua Han, Yubo Tian, Jun Yang, Jianzhao Li, Jinyang Zhang, Gang Liu, Ran Wei, Guojun Zhang
Summary: In this study, a novel medium-entropy alloy (MEA) (Fe65Ni15Cr10Co10)92Ti5Al3 with a dual heterogeneous structure was developed by adding Ti and Al to a previously reported Fe65Ni15Co10Cr10 MEA. The MEA exhibited ultra-high ultimate tensile strength and work hardening extent at room temperature. The addition of Ti and Al induced precipitation and resulted in a continuous FCC -> BCC martensitic transformation and a transformation-induced plasticity effect. The excellent mechanical properties of the alloy were attributed to the synergistic effects of hetero-deformation induced strengthening, precipitation strengthening, and TRIP.
Article
Chemistry, Physical
S. Y. Liang, L. T. Zhang, B. Wang, Y. J. Wang, E. Pineda, J. C. Qiao
Summary: This study focuses on the influence of the thermomechanical protocol on the aging or rejuvenation of glass by decoupling the thermal and mechanical processes. The results show that Labased metallic glass exhibits material hypomnesia, with a clearer rejuvenation trend observed after imposing increasing amplitude strain oscillations. There is a threshold value of the oscillation amplitude that separates the effects of the protocol into acceleration of aging or rejuvenation. This study reveals the correlation between the thermomechanical properties of metallic glass and the previous application of strain oscillations of various amplitudes, providing an effective tool for regulating the structural state of metallic glasses through a simple-operated method.
Article
Chemistry, Physical
Chihui Liu, Hua Zhang, Qing Wang, Panzhi Wang, Jiadian Yang, Fanchao Meng, Xin Zhou, Lilong Zhu, Shangzhou Zhang, Liang Jiang
Summary: Thermal deformation behavior and microstructure evolution of GH141 alloy were efficiently studied using high-throughput double-cone gradient compression. Different compression temperatures resulted in a wide gradient equivalent strain distribution and gradient microstructure. The dynamic recrystallization mechanism shifted towards discontinuous dynamic recrystallization with increasing compression temperature.
Article
Chemistry, Physical
D. Dubaux, J. Zollinger, M. -C. de Weerd, J. Ghanbaja, S. Mathieu, S. Migot, P. Boulet, S. Sturm, V. Fournee, M. Sicot, J. Ledieu
Summary: We report the formation of large and highly twinned dendrites of the Al13Fe4 approximant phase embedded in an fcc Al-rich matrix. Using a rapid cooling technique, the approximant appears as a 10-fold dendrite. The grain distributions within the arm are complex and a single dendrite arm can contain up to four different orientations. Three types of twins, namely {100}, {001} and {201} twins, have been identified. A growth mechanism involving heteroepitaxial growth from a decagonal Al-Fe quasicrystalline seed is proposed to explain the formation of these specific 10-fold motifs.
Article
Chemistry, Physical
Ming Yang, Yibo Zhang, Jie Dong, Yan Huang, Zhichao Lu, Liang Wang, Xuerui Wei, Zhengdong Fu, Jinkui Zhao, Wenli Song, Wei Li, Yuntao Liu, Dong Ma
Summary: A multi-element microalloying strategy has been used to improve the microstructure and mechanical properties of CuZr-based bulk metallic glass composites. Microalloying effectively refines the CuZr phase and results in finely dispersed B2 crystallites embedded in the BMG matrix, leading to the formation of centimeter-sized BMGCs with good mechanical properties.
Article
Chemistry, Physical
Xuejie Zhu, Xuexi Zhang, Mingfang Qian, Ziyi Wang, Aibin Li, Zongning Chen, Muhammad Imran, Lin Geng
Summary: The homogeneous superelastic behavior in shape memory alloys (SMAs) is crucial for their functional and structural fatigue properties, as well as their stable elastocaloric effect (eCE). In this study, a Ti-22Nb-4Zr-2Ta plate was prepared with a strong recrystallized texture, resulting in a completely recoverable superelastic strain and narrow hysteresis. The observation of strain and temperature evolution revealed the importance of diffuse transformation and favorable texture in achieving mesoscopically homogeneous transformation and related elastocaloric effect.
Article
Chemistry, Physical
Mohammad Navazani, Sitarama Raju Kada, Daniel Fabijanic, Matthew Barnett
Summary: This study investigates the effect of Cu and Al addition on an alloy containing multiple principal elements. The results show that adding small amounts of Cu can improve the alloy's ductility and the hardness of the FCC phase can be predicted using a hybrid model. Unlike previous studies, the corrosion resistance of the alloy is not affected by Cu addition, indicating its potential for further development into a fine-grained stainless steel alloy.
Article
Chemistry, Physical
Fatemeh Azizian, Homam Naffakh-Moosavy, Fatemeh Bagheri
Summary: Novel biodegradable Zn-xCu-0.8Mn-0.4Ag alloys were prepared in this study, and the effects of Cu addition and hot extrusion process on microstructure, mechanical properties, and cytotoxicity of the alloys were investigated. The results showed that adding copper and performing a hot extrusion process can significantly improve the mechanical properties of the alloys, making them potential candidates for cardiovascular stents.
Article
Chemistry, Physical
Ivan A. Ditenberg, Denis A. Osipov, Ivan Smirnov, Konstantin V. Grinyaev
Summary: This study investigates the effect of high-temperature annealing on the structural-phase state and microhardness of Ni3Al samples obtained by spark plasma sintering after high-energy ball milling. The results show that certain annealing temperatures promote grain growth and high-density nucleation, leading to the formation of a fine-grained structural state. The study also analyzes the influence of annealing temperature on the strengthening mechanisms.