Article
Materials Science, Multidisciplinary
Deepti Jain, Shubhra Pareek, Arunava Agarwala, Rahul Shrivastava, Wafa Sassi, Saroj K. Parida, Debasis Behera
Summary: Research has shown that in simulated body fluid solution, zinc alloy forms a self-protective layer of Zn(OH)2 and primarily produces zinc oxide, zinc hydroxide, and zinc phosphate compounds as major corrosion products at the interface. Additionally, the corrosion rate of zinc alloy in SBF solution is 0.156-0.0976 mmy(-1), demonstrating its sustainability in biomedical applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Amanda R. Haines, John C. Hemminger
Summary: This study investigates the stability of CuOx and TiO2 nanoparticles on a HOPG substrate, revealing that reducing potentials can cause mobility and agglomeration of TiO2 nanoparticles, affecting their diameter and structure. These results highlight the importance of stability studies in understanding degradation mechanisms of model electrochemical catalysts.
Article
Nanoscience & Nanotechnology
Yunhe Zheng, Laure Bourgeois, Jian-Feng Nie
Summary: This study investigated the structure of precipitates in Mg-Zn-Al alloys, revealing new structural features and proposing that the rod-shaped precipitates can be described by tiling of different shapes.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Katarzyna Mlynarek-Zak, Anna Sypien, Tomasz Czeppe, Anna Bajorek, Aneta Kania, Rafal Babilas
Summary: This study investigated the influence of high cooling rate on the corrosion behavior of a magnesium alloy intended for medical applications. Various analytical methods were used to characterize the corrosion resistance improvement. The results indicate that the cooling rate plays a crucial role in enhancing corrosion resistance.
Article
Materials Science, Multidisciplinary
P. Bhuyan, S. K. Pradhan, R. Mitra, Sumantra Mandal
Summary: This study investigates the influence of strain on the microstructure and high-temperature hot corrosion behavior in Alloy 617. The highly strained specimens showed improved resistance to HTHC due to enhanced Cr diffusion and formation of a continuous, compact Cr-rich oxide film. Recrystallization and evolution of Cr-rich carbides in the strained specimens during HTHC testing increased their likelihood of resisting the aggressive environment for a prolonged duration.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Dhananjay Dubey, Kondababu Kadali, Harikrishna Kancharla, Anuz Zindal, Jayant Jain, K. Mondal, Sudhanshu S. Singh
Summary: The study found that using different aging temperatures affects the distribution and volume fraction of Mg17Al12 precipitates in AZ80 magnesium alloy, as well as the corrosion behavior of the alloy. Lower aging temperature results in higher corrosion resistance, which is correlated with the number density of Mg17Al12 precipitates.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Linchun Zhang, Ailian Zhang, Ke Li, Qian Wang, Junzhe Liu, Hui Wang
Summary: The study investigated the electrical resistance and polarization effect of cement paste containing reinforcement to explore the anti-corrosion properties of steel bars, as well as the microstructure and composition of passivation film and rust on the steel bars. Results showed that the addition of 0.5% NaNO2 + 0.5% Benzotriazole exhibited the highest electrical resistance and polarization electrical resistance, demonstrating improved corrosion resistance for the steel bars.
Article
Chemistry, Analytical
D. Filotas, B. M. Fernandez-Perez, L. Nagy, G. Nagy, R. M. Souto
Summary: This paper introduces a new experimental method for monitoring hydrogen evolution from magnesium-based materials and applies SECM technology for measurement. The results show that the new method provides new information on the hydrogen evolution reaction and can monitor the impact of the oxy-hydroxide layer. A comparison with data from different magnesium alloys contributes to understanding the hydrogen evolution reaction.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Jinsun Liao, Yukiyo Miyawaki
Summary: The atmospheric corrosion resistance of a diecast Mg-Al-Ca-Si alloy was found to be better than that of a wrought AM60 alloy through long-term field exposure and electrochemical tests. The continuous intermetallic phases in the diecast alloy inhibit corrosion propagation, resulting in higher corrosion resistance.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Chemistry, Physical
Masaki Tahara, Kazuya Hasunuma, Hideki Hosoda
Summary: This study investigated the decomposition process of the isothermal alpha '' phase in beta-Ti alloys, and found that the resulting alpha + beta dual phase inherited the microstructural characteristics of the alpha ''(iso) phase. The research results indicate the existence of a strict variant selection rule between the decomposed alpha and beta phases, with a specific variant combination observed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Yuanjiao Li, Alban Morel, Danick Gallant, Janine Mauzeroll
Summary: This study investigated the grain-dependent corrosion behaviors of a polycrystalline aluminum alloy using oil-immersed scanning electrochemical cell microscopy. The results showed that cathodic currents exhibited a strong dependence on grain orientation, while anodic currents had weak dependence and pitting was independent of grain orientation.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Mingjun Yang, Kai Li, Haonan Chen, Jicheng Wang, Zhuo Zhang, Ning Yan, Qiang Lu, Xinyue Lan, Tong Yang, Ying Zhang, Gunan Li, Shuyan Zhang, Yong Du
Summary: This study investigated the corrosion process of MgSi nano-precipitates in an Al-Mg-Si alloy using transmission electron microscopy. It was found that coarsened beta' precipitates in the over-aged state were corroded through dissolution of Mg and oxidation of Si, transforming into amorphous SiO2 precipitates. This newly discovered crystalline-to-amorphous phase transformation plays a role in intragranular corrosion behavior, explaining the reduced susceptibility of over-aged Al-Mg-Si alloys to pitting and intergranular corrosion.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Qiang Yang, Xiaohan Wu, Wei Zhang, Zixaing Yan, Guodong Tong, Xuegang Chen, Shuhui Lv, Tao Xu, Jun Li, Xin Qiu
Summary: An ultrathin wall Mg-8Zn-8Al alloy with coarse ix-Mg grains, ultra-fine beta-Mg grains, and nano-sized icosahedral quasicrystal phase particles has been manufactured by high-pressure die casting. The alloy exhibits outstanding strength and acceptable elongation. The observations through HAADF-STEM reveal possible amorphous regions, C-containing phase and/or MgO aggregations, and Zn-rich clusters and pyramidal precipitates. The combination of ultra-fine grains and the skeleton consisting of nano-sized I-phase particles and solutes contributes to the ultra-high strength. In addition, the study indicates the unavoidable interaction of alloy melt with CO2 during ultra-thin wall HPDC and the possibility of pyramidal precipitation in Zn-containing magnesium alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
G. B. Mazzei, M. G. Burke, D. A. Horner, F. Scenini
Summary: Pb-Caustic Stress Corrosion Cracking initiation was studied on Alloy 690TT at 315 degrees C. The cracking mainly initiated intergranularly following the oxidation of Cr-rich grain boundary carbides. The as-received surfaces showed higher resistance to crack nucleation compared to polished ones due to the absence of carbide decoration on the grain boundaries in the ultrafine-grained near-surface layer. Dislocation entanglements on the cold-worked surface attenuated the emission of dislocations at the surface. Subsequent cracking was caused by Pb incorporation in the oxide, weakening the passive layer and enhancing slip dissolution.
Article
Materials Science, Multidisciplinary
Sebastian Dahle, John Meuthen, Rene Gustus, Alexandra Prowald, Wolfgang Vioel, Wolfgang Maus-Friedrichs
Summary: The self-assembling films were used on pine wood substrates to alter surface wettability, with monodisperse polystyrene spheres deposited onto the substrate via dip coating. The resulting film had a polycrystalline FCC-like structure with typical domain sizes of 5-15 single spheres. Functionalization of this self-assembled coating through O-2 plasma treatment introduced hydroxyl and carbonyl groups, resulting in superhydrophilic behavior.
Article
Engineering, Environmental
Gowri Mohandass, Weikun Chen, Sitaraman Krishnan, Taeyoung Kim
Summary: Electrochemical separation is an energy-efficient method for desalinating brackish water with the potential for energy storage. This study presents a new approach using redox flow batteries to achieve low-energy desalination and energy extraction from iron cyanide and iron citrate redox couples. The results demonstrate low energy consumption, high productivity, and high water recovery, making it a promising solution for brackish water desalination and addressing environmental challenges.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Husain Mehdi, R. S. Mishra
Summary: By utilizing multipass friction stir processing (MPFSP), the present work achieved homogeneously disseminated ZrB2 reinforcement particles and a very fine grain structure in AA6082. The influence of ZrB2 on the microstructure and tensile properties of MPFSP was observed. The study found that ZrB2 successfully shattered coarse dendrite clusters, resulting in a uniform microstructure. Additionally, ZrB2 particles inhibited grain boundary migration and led to a reduction in grain size and HAGBs fraction.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Supreeth Gaddam, Ravi Sankar Haridas, Charlie Sanabria, Deepthi Tammana, Diana Berman, Rajiv S. Mishra
Summary: This study investigates the feasibility of using friction stir welding (FSW) to connect two nitrogen-containing stainless steel jacket web sections. The results show that the FSW fabricated SS 316 LN jackets possess the desired mechanical and physical properties critical to the application, making them suitable for manufacturing internally cooled superconducting cables.
MATERIALS & DESIGN
(2022)
Article
Nanoscience & Nanotechnology
Surekha Yadav, Qiaofu Zhang, Priyanshi Agrawal, Ravi Sankar Haridas, Christopher Morphew, Amit Behera, Zaynab Mahbooba, Jiadong Gong, Rajiv S. Mishra
Summary: In this study, a non-equiatomic CoCrFeNiMo high-entropy alloy was used as a binder for TiB2-HEA composites. The composites with TiB2-6 vol% and TiB2-10 vol% were successfully fabricated using mechanical alloying and spark plasma sintering. The microstructural study showed the importance of the carbide/binder interface on the fracture toughness and strength of the composites. An intermediate layer between TiB2 and HEA phases was observed, which enhanced the wettability between the ceramic and binder phase. The fracture mode changed from intergranular to transgranular as the binder content increased. The TiB2-10 vol% composite exhibited high relative density, Vickers hardness, and fracture toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Multidisciplinary Sciences
Abhijeet Dhal, Saket Thapliyal, Supreeth Gaddam, Priyanka Agrawal, Rajiv S. Mishra
Summary: Smart alloying and microstructural engineering can mitigate challenges in laser-powder bed fusion additive manufacturing. This study combines multiscale nanomechanical and microstructural mapping to reveal the mechanical signatures associated with heat distribution and solidification in L-PBFAM. The presented approach serves as a high throughput methodology to establish the correlation between chemistry, processing, microstructure, and properties in newly designed alloys for L-PBFAM.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Priyanka Agrawal, Sanya Gupta, Abhijeet Dhal, Ramprashad Prabhakaran, Lin Shao, Rajiv S. Mishra
Summary: Properties and radiation responses of a metastable high entropy alloy (HEA) exhibiting the transformation-induced plasticity (TRIP) effect were studied. The innovative engineering used to manufacture this HEA has demonstrated superior mechanical and corrosion properties compared to most advanced stainless steels in 3.5% NaCl. The microstructural evolution and corresponding mechanical response after irradiation were evaluated using detailed transmission electron microscopy and nanoindentation. The study reveals a change in the alloy's metastability with irradiation through a recovery mechanism, where the irradiation-induced transformation is reversed by the temperature-induced transformation, introducing the concept of self-healing made possible by the TRIP behavior of HEA.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Priyanshi Agrawal, Ravi Sankar Haridas, Surekha Yadav, Saket Thapliyal, Abhijeet Dhal, Rajiv S. Mishra
Summary: The solid state nature of the AFSD additive manufacturing process provides advantages in terms of defect formation and microstructural refinement. This study investigates the process optimization, microstructural evolution, and recrystallization kinetics of AFSD deposited SS316. The as-deposited microstructure consists of equiaxed ultrafine grains, with an average grain size of around 5.0 +/- 0.5 μm. The observed necklace-type microstructure is attributed to discontinuous dynamic recrystallization during processing. The recrystallization kinetics of AFSD SS316 are characterized using the JMAK model.
MATERIALS CHARACTERIZATION
(2023)
Article
Engineering, Manufacturing
Ravi Sankar Haridas, Priyanka Agrawal, Saket Thapliyal, Priyanshi Agrawal, Abhijeet Dhal, Shivakant Shukla, Le Zhou, Yongho Sohn, Rajiv S. Mishra
Summary: This study investigates the tensile and high cycle fatigue behavior of a novel Al-Ni-Ti-Zr alloy with a heterogeneous microstructure. The alloy exhibits excellent strength-ductility synergy and fatigue performance, attributed to multiple crack retardation mechanisms and favorable crack propagation pathways. Additionally, a probabilistic model is used to estimate the fatigue life of the alloy based on the stochastic microstructure.
ADDITIVE MANUFACTURING
(2023)
Article
Nanoscience & Nanotechnology
Priyanshi Agrawal, Saket Thapliyal, Priyanka Agrawal, Abhijeet Dhal, Ravi Sankar Haridas, Sanya Gupta, Rajiv S. Mishra
Summary: A paradigm shift in the composition of high entropy alloys (HEAs) has provided new opportunities for microstructural engineering, particularly in laser powder bed fusion (LPBF) additive manufacturing (AM) which allows for fine-tuning of microstructures. This study focused on the microstructural evolution of a metastable dual phase HEA during LPBF AM and established a processing window for the alloy. The microstructure of the alloy was governed by the LPBF process parameters, which influenced the final phase fraction and metastability alteration. Additionally, the study observed variations in stacking fault morphology and nanomechanical behavior of the alloy with changes in process parameters.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Supreeth Gaddam, Mohan Sai Kiran Kumar Yadav Nartu, Advika Chesetti, Srinivas A. Mantri, Rajiv S. Mishra, Narendra B. Dahotre, Rajarshi Banerjee
Summary: Direct laser deposition of a Ni-NbC composite using the laser engineered net shaping process resulted in the formation of a complex hierarchical multi-phase microstructure. The composite consisted of a primary dendritic Ni-rich gamma phase with an interdendritic gamma + NbC eutectic, and further decomposed into a lamellar mixture of gamma + delta phase (Ni3Nb). The study also established the sequence of phase evolution in this complex hierarchical in-situ composite system.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Abhijeet Dhal, Priyanka Agrawal, Ravi Sankar Haridas, Supreeth Gaddam, Aishani Sharma, Digvijay Parganiha, Rajiv S. Mishra, Hirotsugu Kawanaka, Shinji Matsushita, Yusuke Yasuda, Seung Hwan C. Park, Wei Yuan
Summary: This paper investigates the complex deformation mechanisms of Inconel 718 (IN718) superalloy processed by laser powder-bed fusion additive manufacturing (L-PBFAM) and heat treatment using high-resolution nanoindentation. The results reveal a crystal orientation dependency of modulus and hardness, as well as complex microscale strength variation due to thermal cycles. The heat treatment activates multiple precipitation-strengthening mechanisms, leading to a significant increase in yield strength. The orientation-dependent hardness distribution is contributed by the high mechanical anisotropy and coherency strengthening of precipitates.
Article
Materials Science, Multidisciplinary
Anurag Gumaste, Abhijeet Dhal, Priyanshi Agrawal, Ravi Sankar Haridas, Vijay K. Vasudevan, David Weiss, Rajiv S. Mishra
Summary: This study demonstrated an innovative approach, called additive friction stir deposition, to build a high-performance, thermally stable Al-8Ce-10Mg alloy. The deposited material showed significant improvements in yield strength, ductility, and tensile properties at elevated temperatures, which could be attributed to the active strengthening mechanisms in the built component.
Article
Materials Science, Multidisciplinary
Ravi Sankar Haridas, Anurag Gumaste, Pranshul Varshney, Bodhi Ravindran Manu, Kumar Kandasamy, Nilesh Kumar, Rajiv S. Mishra
Summary: Deformation-based solid-state additive manufacturing techniques have advantages such as high build rates, absence of process-induced defects, refined microstructure, large-scale customization, and manufacturing at ambient conditions. A new severe plastic deformation-based Solid-Stir((R)) additive manufacturing (Solid-Stir((R)) AM) technique is introduced, which utilizes frictional heating and layer-by-layer deposition under compressive and shear forces. Aluminum 6061-T6 was used as the feedstock material to demonstrate the feasibility of SolidStir((R)) AM. The deposited material exhibited defect-free, refined, and wrought-like microstructure, improved ductility, and better corrosion resistance. Preliminary results indicate that SolidStir((R)) AM is a promising solid-state additive manufacturing tool with many applications.
Article
Materials Science, Multidisciplinary
Supreeth Gaddam, Ravi Sankar Haridas, Deepthi Tammana, Charlie Sanabria, Christopher J. Lammi, Diana Berman, Rajiv S. Mishra
Summary: Nitrogen-containing austenitic stainless steels are commonly used in tokamak fusion reactors to make various structural components due to their suitable properties. This study proposes a double-sided friction stir welding approach as an alternative to fusion welding for joining N40 plates, which results in superior weldments with low delta ferrite fraction, high joint efficiency, and minimal nitrogen desorption. The double-sided FSW approach outperforms fusion welding for applications in tokamak devices.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Jacob Weiss, Daniel J. Savage, Sven C. Vogel, Brandon A. Mcwilliams, Rajiv S. Mishra, Marko Knezevic
Summary: The evolution of microstructure, strength, and ductility of a metastable high entropy alloy (HEA) was investigated in this study. By controlling the alloy composition and processing conditions, significant improvements in mechanical properties could be achieved. The strain-induced martensitic transformation contributed to plastic strain accommodation and rapid strain hardening, resulting in high strength and ductility of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
