Article
Materials Science, Multidisciplinary
B. Q. Shi, Y. Z. Wang, X. L. Shang, L. Y. Zhao, C. Q. Li, D. C. Chen, B. H. Nie, R. S. Chen, W. Ke
Summary: This study investigates the microstructure evolution and texture development of a RE-containing Mg alloy during hot rolling, aiming to understand the formation of shear bands and their correlation with macro-texture characteristics. The results reveal the roles of different types of twins/variants and dislocation mechanisms in shear band formation, and provide insights into the influence of these factors on the texture development.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
T. Nakata, C. Xu, S. Kamado
Summary: After cold-rolling an Mg-6Zn-0.3Ca alloy sheet with a strong basal texture, anomalous double twinning occurred with the (0001) pole aligned to the transverse direction. These twins served as nucleation sites for statically recrystallized grains during annealing, resulting in weak texture features in the annealed sheet with transverse-direction split (0001) poles.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Gukin Han, Yeonju Noh, Umer Masood Chaudry, Sung Hyuk Park, Kotiba Hamad, Tea-Sung Jun
Summary: The study found that Mg-0.5Ca alloy exhibits temperature-insensitive hardening behavior, while pronounced twinning activity was observed in pure Mg when deformed at low temperatures. The microstructure of Mg-0.5Ca helps reduce twinning behavior, resulting in its hardening behavior being temperature-dependent.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Metallurgy & Metallurgical Engineering
Kai Zhang, Zhutao Shao, Joseph Robson, Yan Huang, Jinghua Zheng, Jun Jiang
Summary: A new cryogenic-hot forming process concept is proposed and proven to improve the ductility and fracture strength of magnesium alloys. This is achieved through effective grain refinement and texture weakening, making it a potential innovative method for producing high-performance magnesium components.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Nanoscience & Nanotechnology
Jing Xu, Yanshuo Peng, Bo Guan, Yunchang Xin, Adrien Chapuis, Guangjie Huang, Qing Liu
Summary: Dual-phase Mg-Li alloys with different rolling paths were studied to investigate the effect of rolling path on microstructure, texture and mechanical anisotropy. The lamellar alpha+beta structures remained after ED-rolling and subsequent annealing, while disappeared after TD-rolling. The texture of beta phase was hardly affected by the rolling path. Annealing only reduced the maximum intensity of texture without changing the type of texture. VPSC simulations revealed that the activated deformation modes and alpha/beta phase boundaries played important roles in texture evolution. There was an obvious mechanical anisotropy after ED-rolling, which disappeared after TD-rolling.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Kai Zhang, Jing-Hua Zheng, Christopher Hopper, Chaoyang Sun, Jun Jiang
Summary: The study shows that the mechanical properties of magnesium alloy (WE43) can be significantly improved at cryogenic temperatures, especially when the compression direction is perpendicular to the extrusion direction. This improvement is attributed to enhanced pyramidal slip.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Umer Masood Chaudry, Min-Su Lee, Tea-Sung Jun
Summary: This study systematically investigated the twin-induced dynamic recrystallization of commercially pure titanium under cryogenic and room temperature. The results showed that higher strain levels resulted in the increased evolution of twins and interactions between twins at room temperature, while cryogenic temperature led to significant grain refinement.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Sangmin Lee, Yong-Deok Im, Ryo Matsumoto, Hiroshi Utsunomiya
Summary: C-HSR rolling can improve the balance of mechanical properties and electrical conductivity of Cu x Al alloy by increasing dislocation density and reducing grain size.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Jan Dittrich, Gergely Farkas, Daria Drozdenko, Michal Knapek, Kristian Mathis, Peter Minarik
Summary: A combination of advanced in-situ experimental techniques, including neutron diffraction, acoustic emission, and electron backscattered diffraction, was used to investigate the deformation behavior of magnesium alloys. The potential and limitations of these techniques were demonstrated in a study on the influence of crystallographic texture on deformation mechanisms in a hot-rolled sheet of the AZ31 alloy. The results showed the twinning activity and its evolution, as well as the deformed microstructure, providing valuable insights into the deformation mechanisms of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Kai Zhang, Jun Jiang
Summary: Compression tests were conducted on Mg-3Al-1Zn alloy at room and cryogenic temperatures to study its low-temperature plasticity. The experiment found that the strain to failure and fracture strength of the alloy increased by 21.4% and 51.6% respectively at cryogenic temperature compared to room temperature. The study also discovered that at room temperature, {10 1 2} tension twins dominated, while at cryogenic temperature, there were abundant (10 (1) over bar 2)-(01 (1) over bar 2) twin-twin interactions. The presence of multiple slips, such as pyramidal and basal slips, in twin-twin interactions enhanced the strain to failure and flow stress at cryogenic temperature.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Shilei Liu, Kaiguang Luo, Hao Gu, Haitao Gao, Charlie Kong, Hailiang Yu
Summary: A processing route involving cryorolling and annealing was used to achieve heterogeneous grain structures in a Cr15Fe55Mn20Ni10 ferrous medium-entropy alloy. Through phase reversion and partial recrystallization, cryorolled sheets exhibited a heterogeneous microstructure with multi-scale grains, resulting in higher yield strength and fracture elongation compared to room-temperature rolled sheets. The improved mechanical properties were attributed to grain boundary hardening, hetero-deformation-induced hardening, and dislocation hardening.
SCRIPTA MATERIALIA
(2023)
Article
Metallurgy & Metallurgical Engineering
Iniobong P. Etim, Wen Zhang, Yi Zhang, Lili Tan, Ke Yang
Summary: Compressive stress has a greater impact on the corrosion rate of Mg-2Zn-0.5Nd alloy compared to tensile stress, due to the introduction of dislocation slip and deformation twins which accelerate corrosion rate. Tension twinning and prismatic slip occur during tensile deformation, while basal slip and tension twinning occur during compressive deformation. Twinning activity increases with plastic strain, correlating with degradation rate.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Palash Chandra Maity, Narasimha Vinod Pulagara, K. N. Chaithanya Kumar, Indranil Lahiri, K. S. Suresh
Summary: The study demonstrates how to prevent the formation of strong cube texture on the surface of high-temperature annealed Ni foils subjected to large rolling reductions, while retaining the intensity of twin boundaries. The evolution of the surface texture of rolled and annealed foils is compared to conventional rolling, shear, and recrystallization texture components. The stability of the cube and ND-rotated cube components in rolled foils is discussed. Despite discontinuous recrystallization mechanisms, a significant fraction of rolling texture components is preserved after annealing. The suppression of the cube component is attributed to the constricted-annealing process and the activation of low-energy twin boundaries. Annealing twins are found to form through a growth fault mechanism during the recrystallization process.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Zhigang Xu, Honglin Zhang, Pavitra Krishnan, Christopher Hale, Laszlo J. Kecskes, Sergey Yarmolenko, Svitlana Fialkova, Qiuming Wei, Jagannathan Sankar
Summary: The study found that the grain size of Mg-6%Al and Mg-9%Al alloy plates was significantly refined after rolling, with the microstructure of plates processed by differential speed rolling (DSR) showing greater refinement compared to conventional rolling (CR) or confined rolling. The as-rolled plates exhibited a strong {0001} basal texture regardless of the rolling method used, with the basal texture intensity of DSR processed plates being lower than other rolling methods. Mechanical properties were significantly improved after rolling for both alloy compositions, with plates processed by DSR showing reduced anisotropy compared to plates processed by CR.
MECHANICS OF MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Xianwei Ren, Yuanchun Huang, Xieyi Zhang, Hao Li, Yongxing Zhao
Summary: The study shows that the magnesium alloy sheet processed through reverse shear deformation has better mechanical properties, while the sheet processed through single shear deformation leads to structural inhomogeneity and inferior mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Computer Science, Information Systems
Priya Darshni, Balwinder Singh Dhaliwal, Raman Kumar, Vincent Aizebeoje Balogun, Sunpreet Singh, Catalin Iulian Pruncu
Summary: Character recognition is a challenging research in pattern recognition and image processing. In this study, an artificial neural network and the open-source software SciLab were utilized to develop a character recognition system. The online backpropagation algorithm was found to be more accurate in classifying characters, compared to the standard batch version.
MULTIMEDIA TOOLS AND APPLICATIONS
(2023)
Article
Engineering, Environmental
Xuemei Wang, Gang Wu, RuoYu Wang, Liang Xu, Haoyang Hu, Peng Sun, Xiaojian Tan, Guoqiang Liu, Jun Jiang
Summary: This study applied an integrated multistrategy, including band convergence, defect engineering, and carrier manipulation, to optimize the thermoelectric properties of SnTe. Cd-doping, Cu2Se nano-precipitate, and Sb-doping were introduced step by step to achieve the goals. The obtained compound (Sn0.86Cd0.04Sb0.1Te)0.96(Cu2Se)0.04 exhibited a high peak ZT of 1.52 at 833 K and a low thermal conductivity of 1.3 W m-1 K-1.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Crystallography
Yan Huang, Jun Jiang
Summary: A von Mises criterion states that five independent slip systems are required for polycrystals to deform uniformly and without failure. However, this criterion has fundamental flaws as there is no evidence to support the simultaneous operation of five independent slip systems. This paper reexamines the von Mises criterion and the Taylor model, and addresses the fundamental issues related to the requirement of independent slip systems and the selection of active slip systems.
Article
Materials Science, Multidisciplinary
Wei Wang, Daniel S. Balint, Amir A. Shirzadi, Yaping Wang, Junyi Lee, Lee Aucott, Jun Jiang
Summary: Understanding the interaction between micro-voids and grain boundaries is crucial for improving the mechanical properties of safety-critical parts. By achieving grain boundary migration across voids, we demonstrate the beneficial effects on mechanical properties. The study used in-situ EBSD/FSE and crystal plasticity finite element modeling to investigate the micromechanisms and quantitative analysis of grain boundary migration on local deformation.
Article
Chemistry, Multidisciplinary
Qiang Zhang, Minhui Yuan, Kaikai Pang, Yuyou Zhang, Ruoyu Wang, Xiaojian Tan, Gang Wu, Haoyang Hu, Jiehua Wu, Peng Sun, Guo-Qiang Liu, Jun Jiang
Summary: In this study, an effective method was reported to improve the low thermoelectric efficiency of p-type (Bi,Sb)2Te3 by incorporating Ag8GeTe6 and Se. The addition of Ag and Ge atoms optimized the carrier concentration and effective mass, while the Sb-rich nanoprecipitates formed coherent interfaces with little loss of carrier mobility. The subsequent Se doping introduced multiple phonon scattering sources and significantly suppressed the lattice thermal conductivity. The optimized sample achieved a high peak ZT of 1.53 at 350 K and a remarkable average ZT of 1.31 (300-500 K), with an extraordinary conversion efficiency of 6.3% at Delta T = 245 K for the constructed TE module.
ADVANCED MATERIALS
(2023)
Article
Automation & Control Systems
Muhammad Rehan, Sarmad Ali Khan, Rakhshanda Naveed, Muhammad Usman, Saqib Anwar, Abdullah Yahia AlFaify, Catalin Iulian Pruncu, Luciano Lamberti
Summary: Wire electric discharge machining (WEDM) is an important non-traditional manufacturing technique that can produce complex shapes with high accuracy. Ti6Al4V is commonly used in biomedical applications and requires machining with high dimensional accuracy. This study investigates the effect of wire offset and electrode composition on machining responses. Experimental results show that a single trim cut at an offset value of 0.11mm provides better surface finish and minimum recast layer, and uncoated brass wire performs the best in terms of surface finish, recast layer thickness, and dimensional accuracy.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Industrial
Fengzhen Sun, Pavel Penchev, Catalin I. Pruncu, Junjie Wang, Chris Pargeter, Yaping Wang, Chang Li, Stefan Dimov, Jun Jiang, Bamber R. K. Blackman
Summary: This study investigates the influence of surface micropatterns on the fracture behavior of adhesively bonded interfaces. Results show that laser patterning can enhance the fracture resistance by modifying surface roughness, wettability, and chemistry. The uniformity of patterning across the surfaces and the effective patterning ratio are found to be crucial factors. Local plastic deformation in the adhesive at the patterned structures is identified as one toughening mechanism.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Physical
Longbing Yi, Haowei Xu, Haibing Yang, Shaolin Huang, Hao Yang, Yanan Li, Qiang Zhang, Zhe Guo, Haoyang Hu, Peng Sun, Xiaojian Tan, Guoqiang Liu, Kun Song, Jun Jiang
Summary: A theoretical model was developed to analyze the Bi2Te3-based TEG system, and the results showed that increasing the height of TEG not only improves conversion efficiency but also leads to a peak value of output power. The height of the fin plays a more essential role than the thickness of the fin in optimizing the performance of TEG. By adding an electrical fan, the net output power is doubled and the net conversion efficiency is improved by more than 80%. The study also designed the structure of the TEG system for different material parameters using the theoretical method.
JOURNAL OF POWER SOURCES
(2023)
Article
Thermodynamics
Zipeng Yan, Longbing Yi, Haowei Xu, Shaolin Huang, Kun Song, Chunrong Pan, Jun Jiang
Summary: The mechanical performance of a segmented thermoelectric generator (TEG) is investigated using theoretical and numerical methods. The results show that the structural stress depends on the ratio of cross-sectional areas between p- and n-type TE legs, while the height ratio of different segments has a significant influence on structural stress. Thermal stress induced by unmatched thermal expansion between different segments increases rapidly with the increase of cross-sectional area and can easily exceed 20% of the total interfacial stress. The conversion efficiency and interfacial stress can be optimized by adjusting the ratio of cross-sectional areas. These findings provide a theoretical basis and guidance in the design of segmented TEGs.
JOURNAL OF THERMAL STRESSES
(2023)
Article
Materials Science, Multidisciplinary
Chen Jin, Ruiyang Li, Yongfu Liu, Liangliang Zhang, Jiahua Zhang, Peng Sun, Zhaohua Luo, Jun Jiang
Summary: An easy strategy is reported to improve the luminescent properties of GGG:Cr3+ phosphor by optimizing the synthesized technology. The EQE is enhanced to 43.6% and the fabricated pc-LEDs achieve a high WPE of 34.3%. These results demonstrate significant advancements in NIR phosphor materials and NIR pc-LED devices.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Engineering, Chemical
Di Xiao, Peng Sun, Jianlin Wu, Yin Zhang, Jiehua Wu, Guoqiang Liu, Haoyang Hu, Jun Hu, Xiaojian Tan, Shi He, Jun Jiang
Summary: Thermoelectric technology is an effective strategy to convert low-grade waste heat to electrical energy directly. However, there is limited research on thermoelectric generators (TEGs) for use in industrial pipelines. In this study, an arch bridge-shaped heat collector was proposed for the pipe to recover wasted thermal energy. The effects of key factors on generating performance were studied, and the experimental results showed the feasibility of using TEGs to recover waste heat from pipes.
Article
Engineering, Environmental
Gang Wu, Xiaojian Tan, Minhui Yuan, Qiang Zhang, Jacques G. Noudem, Zehua Liu, Chen Cui, Jiehua Wu, Haoyang Hu, Peng Sun, Guo-Qiang Liu, Jun Jiang
Summary: A n-type Bi2Te2.7Se0.3 + x wt% PbI2 polycrystalline material with high texture degree and various microstructures was prepared by the temperature gradient method. The dilute PbI2 doping not only adjusted the carrier concentration to an optimal level but also reduced the lattice thermal conductivity, resulting in a peak ZT of 1.26 and improved Vickers hardness of 0.48 GPa.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Chen Jin, Ruiyang Li, Yongfu Liu, Chunhui Zhou, Peng Sun, Zhaohua Luo, Zehua Liu, Jun Jiang
Summary: An excellent FR phosphor, Gd3Al4GaO12:Cr3+, with good external quantum efficiency (EQE), suitable photoluminescence, and high thermal stability is developed by optimizing the sintering technology and chemical design. The phosphor has an emission peak at 734 nm and a band width of 70 nm, matching well with the PFR absorption band. By adjusting the flux of H3BO3 and Cr3+ concentration, the EQE reaches 47.2%, and the thermal stability remains at 96.8% at 423 K. The power-conversion efficiency of the FR pc-LED reaches 24.0% driven at 100 mA, demonstrating its high performance and promising applications in the next-generation FR light source.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Engineering, Manufacturing
Ruiqiang Zhang, Jun Jiang, Jianguo Lin, Victoria A. Yardley
Summary: Thermo-mechanical uniaxial tensile testing is commonly used to characterize material properties under advanced industrial forming processes. This study investigates the effect of nonuniform temperature distributions on the variability of thermo-mechanical properties and microstructures of tested specimens.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Review
Engineering, Mechanical
Behzad Sadeghi, Pasquale Cavaliere, Ali Shabani, Catalin Iulian Pruncu, Luciano Lamberti
Summary: This paper presents a critical review on the measuring methods and parameters affecting nano-tribology in the context of nano-scale wear. It discusses the significance of nano-scale wear and its impact on device performance, lifespan, durability, energy efficiency, cost savings, and environmental sustainability. The review explores the measuring methods employed to assess nano-scale wear, such as scanning probe microscopy techniques, and highlights the capabilities of these techniques in studying various aspects of nano-scale wear. Additionally, it discusses the parameters affecting nano-wear, such as lubrication strategies, stress levels, sliding velocity, and atomic-scale reactions.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2023)