Article
Nanoscience & Nanotechnology
V. V. Shastry, Gaurav Singh, U. Ramamurty
Summary: The study demonstrates that periodic "healing" treatment during fatigue testing of shape memory alloys can effectively extend the fatigue life of the alloy, with 20% of the life elapsed being the optimal treatment time point. Different timing of healing treatment affects the effectiveness of improving fatigue life, indicating irreversible damage has already occurred.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
C. Lauhoff, A. Reul, D. Langenkaemper, P. Krooss, C. Somsen, M. J. Gutmann, B. Pedersen, I. V. Kireeva, Y. I. Chumlyakov, G. Eggeler, W. W. Schmahl, T. Niendorf
Summary: This study investigates the effects of aging treatments on the martensitic transformation and functional properties of Co-Ni-Ga shape memory alloys. The formation of nanoparticles is shown to strongly influence the selection and morphology of martensite, with larger particles promoting irreversibility and smaller particles enhancing functional stability.
Article
Chemistry, Physical
Xin Liu, Heng Li, Yanhong Zhang, Zhiwei Yang, Qingfei Gu, Xinhao Wang, Yifan Zhang, Jingchao Yang
Summary: NiTiFe alloys are widely used in the aerospace industry due to their excellent shape memory properties. However, the deformation behavior and shape memory mechanism of NiTiFe alloys at cryogenic temperatures are still unclear. In this study, we investigated the deformation behavior and shape memory mechanism of Ni47Ti50Fe3 alloy at temperatures ranging from -190℃ to 150℃. The findings revealed that the deformation behavior of NiTiFe alloy can be classified into four classes corresponding to different deformation mechanisms. The best shape memory effect was observed at deformation temperatures near Mf (-180℃).
Article
Chemistry, Physical
Niraj Nayan, Gaurav Singh, S. V. S. Narayana Murty, P. Ramesh Narayan, M. Mohan, P. V. Venkitakrishnan, Upadrasta Ramamurty
Summary: The study found that the addition of Cu to NiTi shape memory alloy can improve its hot workability, while the addition of Fe can decrease its performance. By constructing power dissipation, instability and strain rate sensitivity maps at different temperatures and strain rates, stable domains for processing and optimal processing parameters were identified.
Article
Materials Science, Multidisciplinary
Pengfei Gao, Feng Li, Ke An, Zhengzhi Zhao, Xiaohong Chu, Heng Cui
Summary: This study investigates the effect of silicon content on the microstructure and mechanical properties of quenching and partitioning (QP) steel. Adding silicon increases the strength and ductility of the steel, and forming a multiphase structure in QP steel leads to better mechanical properties.
MATERIALS CHARACTERIZATION
(2022)
Article
Chemistry, Physical
Pedro Cunha Lima, Patricia Freitas Rodrigues, Ana Sofia Ramos, Jose D. M. da Costa, Francisco Manuel Braz Fernandes, Maria Teresa Vieira
Summary: The study of stress-induced martensitic transformation and resistivity behavior in the superelastic NiTi shape memory alloy revealed that significant motion of martensite fronts during tensile cycles resulted in the accumulation of defects and an overall increase in resistivity values. This suggests that shape memory alloy wire has great potential as a stress sensor inside bulk materials.
Article
Materials Science, Multidisciplinary
M. Liu, P. Diercks, A. Manzoni, J. Cizek, U. Ramamurty, J. Banhart
Summary: The study found that thermal cycling of a Ni-excess NiTi alloy led to a continuous build-up of defect structure until saturation, resulting in the formation of two types of defects, pure dislocations and vacancies attached to dislocations.
Article
Materials Science, Multidisciplinary
Zifan Wang, Jingwei Chen, Cyril Besnard, Lenka Kuncicka, Radim Kocich, Alexander M. Korsunsky
Summary: The study revealed that the hot swaging process led to changes in grain morphology and an increase in microstrain. The thermal expansion coefficients of martensite and austenite variants were weakly affected by texture, and the reorientation of martensite was weakly related to the initial microstructure and showed correlation with detwinning.
Article
Materials Science, Multidisciplinary
Swadhin Kumar Patel, Ajit Behera
Summary: NITINOL is a popular and cost-effective shape memory alloy used in various industries. Utilizing powder technology route for manufacturing these SMAs can reduce post-processing, and the uniaxial press and sinter process can yield better density.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Xiaohui Bian, Ludek Heller, Ondrej Tyc, Lukas Kaderavek, Petr Sittner
Summary: This study addresses the unanswered questions regarding superelastic deformation of NiTi wires, including the texture and microstructure of stress induced martensite, the transformation process of austenite to martensite, and the deformation mechanisms at different temperatures. Experimental results reveal distinct differences in superelasticity and plastic deformation mechanisms at different temperatures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
C. Sofras, J. Capek, A. Arabi-Hashemi, C. Leinenbach, M. Frost, K. An, R. E. Loge, M. Strobl, E. Polatidis
Summary: This study investigates the manipulation of crystallographic texture in austenitic stainless steels using laser-powder bed fusion (L-PBF) to tailor their deformation behavior. By adjusting laser power and scanning speed, tailored crystallographic textures can be obtained. The influence of crystallographic texture on deformation behavior is demonstrated, and the asymmetry between tension and compression is discussed.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Eugeny Ostropiko, Alexandr Yu Konstantinov
Summary: This study investigates the impact of strain rate on the functional behavior of TiNi alloy, finding that the one-way shape memory effect decreases with increasing strain rate, while the two-way shape memory effect increases. This indicates the sensitivity of martensite reorientation and strain rate on stress-induced martensite formation, leading to differences in shape recovery curves during thermocycling.
MATERIALS SCIENCE AND TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Mingzhu Dang, Honghao Xiang, Jikang Li, Chao Cai, Qingsong Wei
Summary: A copper-based shape memory alloy Cu-11.85Al-3.2Mn-0.1Ti with desirable superelasticity and shape memory effect was successfully printed by laser powder bed fusion (LPBF) technique. The printed alloy exhibited a microstructure composed of full beta(1)' martensite with a high density of stacking faults and twin crystals. Under temperature stimulation, the printed samples showed remarkable superelasticity and shape memory effect, demonstrating reliable shape recovery ability.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
N. L. Church, C. E. P. Talbot, J. R. Miller, L. D. Connor, S. Michalik, N. G. Jones
Summary: Significant variations in martensite start temperature (Ms) have been observed in the literature for samples of identical composition, but the factors affecting Ms remain unclear, limiting industrial applications. Claims that the isothermal variant of the ω phase (ωiso) may drive changes in Ms have been questioned due to the absence of distinct ωiso following thermal cycling. In this study, synchrotron X-ray diffraction confirmed that dramatic changes in Ms can occur without ωiso formation, suggesting an alternative mechanism based on the total stress model. This improved understanding can resolve discrepancies in the literature and enhance industrial uptake of these materials.
Article
Chemistry, Physical
A. Shuitcev, R. N. Vasin, A. M. Balagurov, L. Li, I. A. Bobrikov, S. Sumnikov, Y. X. Tong
Summary: The thermoelastic martensitic transformation in the polycrystalline Ti29.7Ni50.3Hf10Zr10 alloy was studied using high-resolution and in situ neutron diffraction. The study found that the B19' martensite and austenite have different thermal expansion behaviors. Some disordered austenite does not participate in the martensitic transformation. The addition of Hf and Zr atoms leads to the deterioration of the crystallographic compatibility between martensite and austenite, causing large thermal hysteresis and volume changes upon transformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Jordan A. Evans, Blake T. Sturtevant, Bjorn Clausen, Sven C. Vogel, Fedor F. Balakirev, Jonathan B. Betts, Laurent Capolungo, Ricardo A. Lebensohn, Boris Maiorov
Summary: In this study, resonant ultrasound spectroscopy was used to analyze the elastic anisotropy in extruded aluminum alloy 1100-O, revealing a transversely isotropic texture. The results confirmed by direct sound velocity measurements and neutron diffraction data showed that the texture-induced anisotropy in the material is consistent with extrusion-induced effects, demonstrating the potential of RUS as a general diagnostic and characterization tool for materials with similar levels of texture.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Yaron Itay Ganor, Eitan Tiferet, Sven C. Vogel, Donald W. Brown, Michael Chonin, Asaf Pesach, Amir Hajaj, Andrey Garkun, Shmuel Samuha, Roni Z. Shneck, Ori Yeheskel
Summary: The study investigated post-processing methods for additively manufactured Ti64 components, including heat treatments and HIP cycles, to modify microstructure and mechanical properties. Results showed that lowering the HIP holding temperature retained a fine microstructure, increased elongation and fatigue life. Higher HIP temperature resulted in coarser microstructure and lower Vickers hardness, but superior elongation and fatigue resistance.
Article
Chemistry, Multidisciplinary
Drew R. Onken, Didier Perrodin, Edith D. Bourret, Sven C. Vogel
Summary: This study investigates the impact of the Tl atom on the elpasolite structure, revealing that TLYC exhibits a tetragonal crystal structure at 296K and undergoes a structural transition to a cubic phase at 464K.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2021)
Editorial Material
Materials Science, Multidisciplinary
Sven C. Vogel, Marisa J. Monreal, Aditya P. Shivprasad
Article
Materials Science, Multidisciplinary
Sven C. Vogel, David A. Andersson, Marisa J. Monreal, J. Matthew Jackson, S. Scott Parker, Gaoxue Wang, Ping Yang, Jianzhong Zhang
Summary: Uranium trichloride (UCl3) is actively researched for various applications, such as molten salt reactors and actinide processing. The crystal structure evolution of UCl3 from room temperature to its melting point was studied using high-temperature neutron diffraction, with the thermal expansion of lattice parameters quantified. The melting point of UCl3 was determined to be 1108.2 K by differential scanning calorimetry.
Article
Chemistry, Physical
Stephen Scott Parker, A. Long, C. Lhermitte, S. Vogel, M. Monreal, J. M. Jackson
Summary: This study experimentally measured the melt point, enthalpy of fusion, and volumetric expansion of liquid chlorides. A novel method using neutron radiography was introduced for density measurement. The results and proposed model are significant for understanding the thermophysical properties of liquid chlorides.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Materials Science, Multidisciplinary
Vedant K. Mehta, Sven C. Vogel, Dan Kotlyar, Michael W. D. Cooper
Summary: This paper presents a study on the high-temperature properties of yttrium and yttrium hydride, including thermal lattice expansion effects, elastic moduli, and density. By providing these newly generated properties, it enhances the accuracy and reliability of reactor modeling.
Article
Nanoscience & Nanotechnology
Nikolai Matukhno, Nemanja Kljestan, Sven C. Vogel, Marko Knezevic
Summary: This paper presents the results of an experimental investigation into the effect of cyclic bending under tension on the elongation-to-fracture (ETF) and strength of AZ31 sheets. The study found that the use of a continuous-bending-under-tension (CBT) apparatus can enhance ETF to some extent. However, the improvements in ETF are relatively small due to the uniform elongation of the alloy. The analysis of grain structure and texture evolution shows that slip-dominated deformation and twinning followed by detwinning occur during the process. Additionally, the study explores the tradeoff between strength and ductility by subjecting the alloy to a certain number of CBT cycles followed by heat treatments (HT). The findings reveal that the strength of the alloy can be increased by over 30% while preserving at least 5% of its ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Samantha K. Lawrence, Reeju Pokharel, Bjorn Clausen, Donald W. Brown, Chris San Marchi, Mary K. O'Brien, Sangwon Lee, Jun-Sang Park, Peter Kenesei
Summary: This study used high energy synchrotron x-ray diffraction to investigate the microstructural evolution during uniaxial deformation of conventionally manufactured and additively manufactured (AM) 304L stainless steel, as well as the effect of internal hydrogen. It was found that solute hydrogen can reduce the required applied strain for austenite transformation to epsilon-martensite and alpha'-martensite in both forged and AM stainless steel. Similarly, a higher fraction of transformation product was observed when the microstructure was saturated with hydrogen. Deformation-induced phase transformations also resulted in a change in strain partitioning behavior, which was influenced by the chemical composition and stacking fault energy of the starting and hydrogen-charged materials.
Article
Materials Science, Multidisciplinary
Vancho Kocevski, Daniel A. Rehn, Adrien J. Terricabras, Arjen van Veelen, Michael W. D. Cooper, Scarlett Widgeon Paisner, Sven C. Vogel, Joshua T. White, David A. Andersson
Summary: Uranium mononitride (UN) is a promising nuclear fuel with advantageous properties for high temperature applications. This study uses ab initio molecular dynamics (AIMD) simulations to investigate UN behavior at different temperatures. The simulations reveal softening of phonon modes and increased compressibility of UN with temperature. The calculated thermal expansion and elastic properties are in good agreement with experimental measurements. Furthermore, the electronic properties and thermal conductivity are better predicted using AIMD simulations compared to calculations at 0 K. However, the thermal diffusivity shows an opposite temperature dependence due to underestimated electronic thermal conductivity.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Instruments & Instrumentation
Guangliang Yang, Josh Schoetker, Dan Poulson, Elena Guardincerri, J. M. Durham, Sven Vogel, Shaun Hoerner, Derek Aberle, Ke-Xun Sun, C. L. Morris, Ralf Kaiser, Andrew Osborne
Summary: Cosmic ray muons are massive charged particles that can penetrate through dense material, making them ideal for nondestructive imaging. A Giant Muon Tracker was used to measure muon tracks passing through samples and validate a Monte Carlo simulation. The imaging results from the simulation and experiment showed excellent agreement.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Materials Science, Multidisciplinary
Daniel J. Savage, Joshua T. White, Bjorn Clausen, Dale T. Carver, Sven C. Vogel, Sean R. Agnew, Donald W. Brown
Summary: The impact of deformation-induced structure change on the evolution of thermally induced strains is studied. The results show that the texture softens during heating, and twin boundary motion can accommodate large thermal strains. There are correlations between micro- and macro-level thermal expansions. The findings are significant for understanding the behavior of textured materials.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Instruments & Instrumentation
Matthew M. Schmitt, Daniel J. Savage, James J. Wall, John D. Yeager, Chanho Lee, Sven C. Vogel
Summary: The US Federal Regulations require regular inspection of centrifugally cast austenitic stainless steel pipes used in primary cooling loops of nuclear power plants. Conventional ultrasonic techniques are unreliable due to microstructural attenuation of ultrasonic waves. Texture and phase fraction measurements using neutron diffraction scans will inform the development of a more robust diagnostic tool.
QUANTUM BEAM SCIENCE
(2021)
Article
Imaging Science & Photographic Technology
Alexander M. Long, S. Scott Parker, D. Travis Carver, J. Matt Jackson, Marisa J. Monreal, Darcy A. Newmark, Sven C. Vogel
Summary: This study presents a novel approach to measuring densities of molten salt systems using neutron radiography. The results match well with previous literature values, confirming the viability of neutron radiography for measuring density as a function of temperature in molten salt systems. Additionally, advantages of using neutron radiography over other methods are discussed, with future work focusing on improving this technique.
JOURNAL OF IMAGING
(2021)
