Article
Nanoscience & Nanotechnology
Tao Liang, Lianghua Xiong, Hongbo Lou, Fujun Lan, Junran Zhang, Ye Liu, Dongsheng Li, Qiaoshi Zeng, Zhidan Zeng
Summary: The mechanical properties of hexagonal silicon (Si-IV) were experimentally studied, revealing that Si-IV has similar elastic modulus and hardness to the common diamond cubic silicon. This similarity enables the integration of Si-IV into conventional Si-based devices and its potential for photovoltaic and optoelectronic applications.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
D. V. Lazurenko, I. Yu. Petrov, V. I. Mali, M. A. Esikov, R. I. Kuzmin, V. V. Lozanov, F. Pyczak, A. Stark, G. D. Dovzhenko, I. A. Bataev, D. S. Terentiev, A. A. Ruktuev
Summary: This study aims to improve the brittleness issue of Ti-Al3Ti metal-intermetallic laminate composites by changing the crystal structure of Al3Ti to the more ductile L12 structure through alloying with silver. The optimal fabrication regimes of Ti-Ti(Al1-xAgx)3 composites were determined based on in-situ synchrotron X-ray diffraction analysis, leading to enhanced properties of the composite material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
G. Garces, J. Medina, P. Perez, A. Stark, N. Schell, P. Adeva
Summary: In-situ compression tests using synchrotron radiation diffraction were conducted to investigate the load partitioning between the magnesium and titanium phases in an extruded Mg-15%Ti (vol.%) composite from room temperature up to 300 degrees C. The results showed that the magnesium matrix composite deforms mainly by the activation of the extension twinning system up to 200 degrees C, and the volume fraction of twins increases with plastic strain but decreases with compression temperature. Hard titanium particles bear an additional load transferred by the soft magnesium matrix from room temperature up to 300 degrees C. Twins within magnesium grains behave as an additional reinforcement at low temperature (below 200 degrees C), inducing an increase in the work hardening of the composite.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Chemistry, Physical
Klaudia Fekete, Gergely Farkas, Daria Drozdenko, Domonkos Tolnai, Andreas Stark, Patrik Dobron, Gerardo Garces, Kristian Mathis
Summary: The compressive deformation behavior of Mg88Zn7Y5 alloy with a high volume fraction of the LPSO phase was studied in relation to temperature, showing a decrease in yield strength with increasing deformation temperature. The macroscopic yielding of the alloy is controlled by the activation of deformation kinking in the LPSO phase at all tested temperatures.
Article
Materials Science, Multidisciplinary
Qing-Kun Meng, Jia-Dong Xu, Huan Li, Chong-Hang Zhao, Ji-Qiu Qi, Fu-Xiang Wei, Yan-Wei Sui, Wen Ma
Summary: This study investigates the solid state phase transformations of Ti alloys and their correlation with mechanical properties. It was found that cold rolling and annealing treatments can impact material properties, providing a theoretical basis for the design of biomedical Ti alloys.
Article
Materials Science, Multidisciplinary
Shuhui Lv, Qiang Yang, Xiaoling Lv, Fanzhi Meng, Xin Qiu
Summary: A ZK60 alloy was prepared by conventional direct extrusion at a reduced temperature, resulting in finer DRXed grains with stronger fiber texture and more abundant lath-like sub-grains. After aging, nanosized precipitates formed in both DRXed and non-recrystallized grains, while coarse MgZn2 particles precipitated on sub-grain boundaries. The aged ZK60 alloy exhibited significantly high ultimate compressive strength, excellent strength-ductility balance, and a weakened tension-compression yield strength asymmetry.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Jiarong Gao, Xinyu Sun, Yunxuan Zhou, Quan Dong, Jun Tan, Xianhua Chen, Bin Jiang, Fusheng Pan
Summary: This study focuses on a newly developed low-cost Mg-8Al-4Ce-0.2Zn-0.2Mn alloy named AE84, which has higher aluminum content. The addition of aluminum increases the fraction of aluminum-containing second phases and strengthens the alloy through heat treatment. AE84 alloys demonstrate outstanding tensile performance at both room temperature and elevated temperatures. This study provides a new idea for the composition design of heat-resistant alloys.
Article
Nanoscience & Nanotechnology
Wenjun Gao, Xianglei Dong, Yuheng Fan, Hongliang Zhao, Chunwen Guo, Kangrong Weng, Yang Xiao
Summary: The study found that the addition of Ca resulted in the formation of micro-sized Mg2Ca and a reduction in volume fraction of the alpha phase, affecting the microstructure and texture, leading to improved mechanical performance of Mg-9Li-0.3Ca compared to Mg-9Li during tension.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Xiangsheng Xia, Dayu Shu, Echuan Yang, Chuankai Hu
Summary: The microstructures and mechanical properties of Mg-8.5Gd-4.5Y-0.3Zr alloys with and without Zn addition were investigated in this study, and the strengthening mechanisms of these two alloys were also discussed. The results show that the as-extruded alloy with Zn addition has finer grains due to the inhibited dislocation motion. Dynamic precipitation occurs during the extrusion process and unevenly distributes in both alloys, promoting grain refinement. The alloy with Zn addition exhibits significantly higher yield strength and elongation compared to the alloy without Zn addition, mainly attributed to the strengthening effects of the LPSO and g0 phases.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Zheng Jia, Yongzhi Yu, Bing Yu, Li Fu, Wenyi Hu, Yichuan Shao
Summary: This paper investigated the effect of Ca and Zr additions on the microstructure and mechanical properties of Mg-Sn alloys. It was found that Ca inhibited the dynamic recrystallization behavior of the alloys, while Zr promoted it. The addition of Ca and Zr elements refined the grain size and strengthened the second phase dispersion, leading to improved mechanical properties of the alloy.
Review
Materials Science, Multidisciplinary
Berit Zeller-Plumhoff, Domonkos Tolnai, Martin Wolff, Imke Greving, Norbert Hort, Regine Willumeit-Roemer
Summary: The benefits of using synchrotron radiation for investigating magnesium alloys, particularly for their application as biodegradable implants, are demonstrated in this review. Progress in experimental environments and all stages of materials testing using synchrotron radiation, from development to corrosion testing, ex vivo integration assessment, and stability assessment, is covered. The review also includes advances in micro- and nanotomographic imaging regimes and complementary techniques, with an outlook into future developments provided.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Chemistry, Physical
L. Millan, G. Bokuchava, R. Fernandez, I Papushkin, G. Gonzalez-Doncel
Summary: The stress equilibrium (SE) method is a powerful tool for calculating the un-stressed lattice parameter a(0) to determine residual stress (RS) by diffraction techniques. It is particularly useful in exploring the effects of microstructural factors on macroscopic residual stress and can address complex cases that have not been fully exploited.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Metallurgy & Metallurgical Engineering
Youhong Peng, Kesong Miao, Wei Sun, Chenglu Liu, Hao Wu, Lin Geng, Guohua Fan
Summary: Characterizing the microstructure and deformation mechanism of metallic materials is crucial for understanding the microstructure-property relationship. Advanced synchrotron radiation facilities have enabled non-destructive visualization of full-field structural information in three dimensions, contributing to significant progress in recent decades. Future innovations in next-generation synchrotron radiation and emerging technologies hold great potential for further advancements in material characterization.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Yuanxiao Dai, MengHan Xiao, Yaobo Hu, Yan Yang, Bin Jiang, Tianxu Zheng, Li Dong, Baoqing Yang, Changyong Zheng
Summary: By designing extrusion parameters, the Mg-0.12Ca-0.08Ba alloy underwent grain refinement and texture control, resulting in the best performance of the extruded samples with different crystallographic orientations.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Qiqi Li, Fei Guo, Linjiang Chai, Yanlong Ma, Luyao Jiang, Qiuyu Chen, Chengquan Zhang, Haiding Liu, Dingfei Zhang, Bin Jiang
Summary: Laser surface remelting (LSR) treatment refined the grains and redistributed the secondary phase of Mg-6.2Y magnesium alloy, resulting in significant improvement of the mechanical properties of the surface.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
D. V. Lazurenko, I. Yu. Petrov, V. I. Mali, M. A. Esikov, R. I. Kuzmin, V. V. Lozanov, F. Pyczak, A. Stark, G. D. Dovzhenko, I. A. Bataev, D. S. Terentiev, A. A. Ruktuev
Summary: This study aims to improve the brittleness issue of Ti-Al3Ti metal-intermetallic laminate composites by changing the crystal structure of Al3Ti to the more ductile L12 structure through alloying with silver. The optimal fabrication regimes of Ti-Ti(Al1-xAgx)3 composites were determined based on in-situ synchrotron X-ray diffraction analysis, leading to enhanced properties of the composite material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Zhida Liang, Jonathan D. H. Paul, Andreas Stark, Andreas Bezold, Steffen Neumeier, Mathias Goeken, Florian Pyczak
Summary: Recent research has explored the Co-Al-W system and revealed interesting properties, but its high tungsten content limits industrial applications. As a result, new high temperature superalloys based on the Co-Ni-Al-Ti system, strengthened by chromium and different refractory elements, have been developed. These alloys exhibit better mechanical properties at high temperatures compared to conventional Ni-based superalloys and Co-based superalloys.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Marina Lukas, Michael Mayer, Andreas Stark, Bernhard Friessnegger, Thomas Honigmann, Matthew Galler, Gerald Ressel
Summary: This study focuses on the influence of tempering on residual stresses and mechanical properties of a steel wire. The results show that a reduction of micro-residual stresses increases the yield strength, while a reduction of macro-residual stresses decreases the yield strength and tensile strength.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Michael Musi, Helmut Clemens, Andreas Stark, Petra Spoerk-Erdely
Summary: Powder production by gas atomization of gamma-TiAl based alloys results in a highly nonequilibrium material. In this study, in situ high-energy X-ray diffraction was used to investigate the thermodynamic equilibration and phase distribution during heating of a Ti-46.3Al-2.2W-0.2B (at%) powder. The results show that temperature exposure mainly affects the dendritic parts of the microstructure, especially when the alpha phase is transformed into gamma phase with small embedded grains of alpha(2) and beta(0).
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Metallurgy & Metallurgical Engineering
Fengxin Mao, Moritz Weidt, Peter Staron, Sebastian Busch, Andreas Stark, Luis Barrales-Mora
Summary: In this study, the age-hardening behavior of two commercial Al-Si-Cu-Mg alloys was investigated using experimental and simulation methods. The characteristics of precipitates were summarized and a prediction model was developed.
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
S. Jakob, A. Lorich, W. Knabl, A. Stark, H. Clemens, P. Spoerk-Erdely, V. Maier-Kiener
Summary: Molybdenum is an excellent structural material for high temperature applications, but the influence of residual pores may cause differences in microstructural evolution.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Chemistry, Physical
Heike Gabrisch, Michaela Janovska, Marcus W. Rackel, Florian Pyczak, Andreas Stark
Summary: The microstructure and elastic properties of a niobium-containing γ-TiAl alloy during annealing at 550 degrees C were investigated. The results revealed a continuous increase in the E-modulus, which can be attributed to elastic strains within the α2 lamellae resulting from lattice transformations.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Stefan Heinze, Andreas Stark, Julius Hendl, Christoph Leyens
Summary: This paper investigates the formation of Cr2AlC phase during annealing post-treatment, focusing on the initial phases of amorphous CrAl-C and (Cr,Al)2C. The influence of deposition process on Cr2AlC formation, texture, and phase composition is studied, along with a detailed discussion of the intermediate phase. Thin films of Cr-Al-C were deposited using Direct Current Magnetron Sputtering and High Power Pulsed Magnetron Sputtering, and in situ synchrotron and high-temperature X-ray diffraction experiments were conducted to examine microstructure, phase composition, and texture, accompanied by electron microscopy. The formation of Cr2AlC is a temperature and time-dependent process with an intermediate state characterized by the formation of disordered-Cr2AlC phase.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Stefan Heinze, Tim Kruelle, Lars Ewenz, Christina Krywka, Anton Davydok, Andreas Stark, Rainer Cremer, Christoph Leyens
Summary: This paper investigates the influence of HPPMS and DCMS coating deposition processes, bias voltage, deposition temperature, and substrate on the properties of Cr-Al-C thin films. The results show that the as-deposited coatings consist of amorphous and crystalline areas, with their ratio depending on the deposition process and substrate. The crystalline phase is identified as metastable (Cr,Al)2C, with the highest crystallinity observed in the DCMS coatings. Increasing temperature and decreasing bias voltage enhance the crystallinity of HPPMS coatings. In-situ experiments reveal that the amorphous areas act as a residual stress buffer. The hardness and Young's modulus of the coatings increase with crystallinity and are slightly higher in crystalline HPPMS coatings compared to DCMS coatings.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Hailong Shi, Weimin Gan, Claude Esling, Yudong Zhang, Xiaojun Wang, Emad Maawad, Andreas Stark, Xiaohu Li, Lidong Wang
Summary: In this study, the orientation evolution of cold-rolled Cu foils during heating was investigated, and the results showed a transition from the cold-rolling texture to a recrystallization texture dominated by two rotated orientations. The formation of the recrystallization texture was influenced by both intrinsic microstructural factors and extrinsic geometrical factors. The post-nucleation growth was affected by the biaxial thermal elastic constraint and surface energy, resulting in a mixed texture at the completion of recrystallization. The coherent Sigma 3 boundaries stabilized the growth of the new components.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Pablo Perez, Judit Medina, Maria Fernanda Vega, Gerardo Garces, Paloma Adeva
Summary: The effect of thermos-mechanical processing and thermal treatments on the microstructure of a single phase fcc-based Al5Co15Cr30Fe25Ni25 high entropy alloy is evaluated. Different routes of thermo-mechanical processing (forging, cold rolling, warm rolling, hot rolling) were followed and the microstructural evolution of highly deformed cold rolled sheets with annealing temperature was analyzed. The results show that recrystallization of the microstructure begins at 600 degrees C, leading to higher hardness in the thermo-mechanically treated alloys compared to the annealed alloys.
Article
Materials Science, Multidisciplinary
Gerardo Garces, Pablo Perez, Judit Medina, Rafael Barea, Adrian Gomez, Javier Garcia, Paloma Adeva
Summary: The Mg-2%Nd alloy, after thermal treatment and quenching at 520 degrees C, shows plastic instabilities at intermediate temperatures between 100 and 300 degrees C due to dynamic strain aging caused by the presence of neodymium atoms. The competition between the precipitation of Mg-Nd particles and the DSA phenomenon during compression tests depends on the test temperature. Below 200 degrees C, the formation of neodymium-rich precipitates is slow and the interaction is insignificant, resulting in a normal behavior of the DSA. However, at temperatures above 200 degrees C, the faster formation of neodymium-rich precipitates and the decrease of neodymium in solid solution lead to an inverted evolution of the critical strain with temperature.
Article
Nanoscience & Nanotechnology
T. Strohmann, P. Barriobero-Vila, J. Gussone, D. Melching, A. Stark, N. Schell, G. Requena
Summary: In this study, unsupervised machine learning is used to analyze in situ diffraction data of an additively manufactured Ti-6Al-4V alloy. The model is trained on a dataset consisting of four thermal cycles and can detect periods of fast phase transformation based on the steep gradient of the reconstruction error. Additionally, the features in the latent space of the autoencoder show correlation with the volume fractions of alpha/alpha' and beta. This methodology allows for on-site monitoring of phase transformation kinetics during experiments at synchrotrons without the need for continuous training or manual data labeling.
SCRIPTA MATERIALIA
(2023)
