Article
Materials Science, Multidisciplinary
Zhenduo Ma, Guo Li, Zhonghua Su, Guobing Wei, Yuanding Huang, Norbert Hort, Amir Hadadzadeh, Mary A. Wells
Summary: The hot deformation behavior of dual-phase Mg-9Li-3Al alloys was investigated through isothermal hot compression tests. Flow curves exhibited periodic fluctuation at high strain rates, which can be considered as the Portevin-Le Chatelier effect. The relationship among flow stress, strain rate, and deformation temperature was analyzed, and the deformation activation energy and basic material factors were calculated. A processing map composed of power dissipation and instability domains was established to reveal the hot workability. The formation of needle-shaped a-Mg phase was attributed to the deformation-induced transformation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Haitao Lu, Dazhao Li, Siyuan Li, Yong'an Chen
Summary: Hot compression tests were conducted on Fe-27.34Mn-8.63Al-1.03C lightweight steel to study its hot deformation behavior and optimize the hot workability parameters. The results showed an increase in flow stress with decreasing deformation temperature and increasing strain rate. The activation energy for hot deformation was determined to be 422.88 kJ/mol based on the constitutive equation. A relationship between critical stress and peak stress was established, and a dynamic recrystallization kinetic model was obtained. The effects of strain rate and deformation temperature on the volume fraction of dynamically recrystallized grains were explored.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Metallurgy & Metallurgical Engineering
Haijian Xu, Wanqing Hu, Chao Kang, Weijuan Li, Xiaochun Sha
Summary: The hot deformation behavior of lean duplex stainless steel 2101 was investigated through isothermal compressive tests. The study found that peak stress decreased with increased deformation temperature and decreased strain rate, with softening mechanisms identified as dynamic recovery for ferrite and dynamic recrystallization for austenite. Flow instability regions may occur at lower strain rates and temperatures due to discrepancies in deformation coordination between ferrite and austenite phases.
ISIJ INTERNATIONAL
(2021)
Article
Metallurgy & Metallurgical Engineering
Haijian Xu, Chufei Han, YuPu Bai, Weijuan Li, Xin Qiao, Xiaochun Sha
Summary: The flow behavior and microstructure evolution of SDSS2507 were systematically studied through hot compressive tests. The hot processing map was constructed based on the obtained stress-strain curves and equations. The optimum hot processing parameters for SDSS2507 were found to be in a low strain rate range of 0.1-3 s(-1) with the temperature range above 950 degrees C.
IRONMAKING & STEELMAKING
(2022)
Article
Chemistry, Physical
Jiaguo Tang, Youping Yi, Hailin He, Shiquan Huang, Jingjing Zhang, Fei Dong
Summary: In this study, isothermal compression tests were conducted on the 2195 Al-Cu-Li alloy to investigate its hot deformation behavior. A processing map was established to predict the workability under different conditions, and the corresponding microstructures were analyzed to reveal the deformation mechanisms. The results indicate that the optimal hot-working conditions for the alloy are at temperatures of 460-500 degrees C and strain rates of 10-3-10-2 s-1, with dominant mechanisms of dynamic recrystallization and dynamic recovery.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Bo Li, Yonghua Duan, Shanju Zheng, Mingjun Peng, Mengnie Li, Hengyong Bu
Summary: Hot compression tests were conducted to evaluate the hot deformation behavior of 60Mg-30Pb-9.2Al-0.8B alloy. The Arrhenius constitutive equation and processing map with strain compensation were established based on the dynamic material model. The results showed three stages in the stress-strain curves during hot compression, with characteristics of work hardening, dynamic recovery, and dynamic recrystallization. The improved Arrhenius strain compensation constitutive model had higher precision than the traditional model. Optimum hot working parameters were determined based on the analysis of the processing map.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Xiaomin Huang, Ben Guan, Baoyu Wang, Yong Zang
Summary: Isothermal tensile tests are conducted on 2195-O Al-Li alloy to investigate its hot deformation behavior. The results show that the established constitutive equation accurately predicts the deformation behavior of the alloy. The fracture mechanism of the tensile specimens changes from ductile fracture to brittle fracture as the temperature increases. The average grain size of the specimens increases with increasing temperature, but coarsening occurs at higher temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Hua Wang, Dengfeng Yin, Ming-Chun Zhao, Yan Tian, Andrej Atrens
Summary: Hot deformation behavior and associated microstructural evolution in a quaternary Al-Cu-Li-Zn alloy were studied under different deformation conditions. The study found that dynamic recrystallization (DRX) was influenced by grain orientation and particle simulated nucleation (PSN) was the primary mechanism of DRX. Additionally, only a small fraction of DRX grains appeared under certain temperature and strain rate conditions.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Yushe Gao, Xianghong Liu, Haisheng Chen, Xiangyi Xue, Huixian Gao, Wenzhong Luo, Kaixuan Wang, Shaoqiang Li, Yuxuan Du
Summary: The hot workability and microstructural evolution of Ti-5.5Al-5Mo-5V-2Nb-1Fe-1Zr titanium alloy, also known as Ti555211 alloy, were studied during compressive deformation at different temperatures and strain rates. It was observed that samples deformed at 750 and 850 degrees C consisted of alpha and beta phases, while samples deformed at 950 and 1050 degrees C were composed of single beta phase. The plastic deformation of Ti555211 alloy was mainly governed by the beta phase, as the microstructures of the beta phase varied more substantially than those of the alpha phase in the alpha + beta phase region. Processing maps based on a dynamic material model were established to optimize the process parameters. Ti555211 alloy exhibited better hot workability in the beta phase zone, with the optimal hot processing area ranging from 925 to 1025 degrees C and a strain rate range of 0.005 to 0.03 s(-1).
Article
Chemistry, Physical
G. Sukumar, B. Bhav Singh, I. Balasundar, Amit Bhattacharjee, V. Subramanya Sarma
Summary: The hot deformation characteristics of Ti-4Al-2.5V-1.5Fe-0.25O alloy in different conditions were studied through isothermal hot compression tests. Various methods such as strain rate sensitivity, kinetic analysis, and microstructural characterization were used to understand the deformation behavior and identify the optimal regime for primary breakdown. The results showed different deformation mechanisms in the beta and alpha + beta fields at different strain rates, and the optimal thermomechanical processing conditions were determined through a combination of strain rate sensitivity map and microstructural analysis. Constitutive equations were also developed to predict the flow stress values in different fields.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Anjin Liu, Lin Wang, Xingwang Cheng, Zixuan Ning, Lei Pan
Summary: The hot deformation behavior and microstructure evolution of newly developed as-cast high-density steel were investigated. The steel exhibited higher activation energy and an increase in the degree of dynamic recrystallization with increasing temperature and decreasing strain rate.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Metallurgy & Metallurgical Engineering
Min Qi, Hong-yan Wu, Ying Dong, Lin-xiu Du
Summary: This study investigated the hot deformation behavior of 42CrMo4 steel at different temperatures and strain rates using thermo-simulation single-pass compression tests. The results showed that the flow stress value increased with decreasing deformation temperature and increasing strain rate. Increasing temperature and reducing strain rate promoted dynamic recrystallization (DRX), but higher strain rates also led to adiabatic heating. The expressions for the Zener-Hollomon (Z) value and dynamic recrystallized grain size (D-DRX) were determined. The processing map and instability map indicated the suitable temperature and strain rate ranges for hot working, as well as the temperature and strain rate ranges where instability occurred.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Le Chen, Bing Zhang, Yan Yang, Tianli Zhao, Yi Xu, Qi Wang, Bin Zan, Jun Cai, Kuaishe Wang, Xi Chen
Summary: Nickel-based superalloy has excellent mechanical properties at high temperature, but the high deformation resistance, narrow deformation temperature range, and complex microstructure evolution of the alloy pose great challenges to its plastic deformation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Changmin Li, Liang Huang, Mingjie Zhao, Shiqi Guo, Yang Su, Jianjun Li
Summary: This paper investigates the hot working properties of Ti-6554 alloy. Hot compression experiments were conducted in a temperature range of 680 to 830°C and a strain rate range of 0.001 to 10 s-1. The hot workability of the alloy was analyzed based on the hot processing map and microstructure evolution. The results revealed that the thermal activation energy was higher at higher strain rates, and the average thermal activation energy decreased with increasing strain. The peak efficiency in the hot processing map was observed at specific temperature and strain rate conditions. The instability regions were concentrated at higher strain rates, and flow localization was observed as a typical instability phenomenon. The volume fraction and average size of the alpha phase decreased due to the dynamic phase transformation with increasing strain rate and temperature. The deformation mechanism transitioned from dynamic recovery to dynamic recrystallization. The types of dynamic recrystallization for the beta phase were identified as discontinuous and continuous, depending on temperature and strain rate. Additionally, the spheroidization mechanism of the equiaxed alpha phase was analyzed. The aspect ratio of the equiaxed alpha phase increased under compressive stress, transforming into lamellar alpha phase. The low angle grain boundaries gradually transformed into high angle grain boundaries with wedging of the beta phase, resulting in spheroidization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Automation & Control Systems
Japheth Obiko, Lesley Chown, David Whitefield, Micheal Bodunrin
Summary: This study investigates the hot deformation behavior and optimal process parameters of ASTM A335 P92 steel. It is found that the steel exhibits dynamic recovery behavior at high temperatures, and the flow stress decreases with increasing temperature or decreasing strain rate. The correlation between the constructed processing maps and microstructure provides guidance for selecting process parameters.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Ping Zhang, Xiujie Yue, Yeran Gao, Zhenyong Lin, Shunxiang Wang, Songting Zhang
Summary: This paper investigates the strengthening mechanism of highspeed cutting and solid particle-entrained waterjet peening (HSC-WJP) composite reinforcement on 7075-T6 aluminum alloy. The research results show that composite reinforcement can improve surface quality, reduce surface pits and roughness, and decrease the size of precipitation-free zone (PFZ) at grain boundaries.
Article
Materials Science, Multidisciplinary
Sangyoon Lee, Hwi Yoon, Sanghun Lee, Seung-min Chung, Hyungjun Kim
Summary: The wettability of metal oxides, particularly HfO2 thin films deposited via atomic layer deposition, and its correlation with surface free energy have been studied. It was found that surface oxygen species significantly affect the intrinsic hydrophilicity of HfO2 thin films, and the crystalline orientations also evolve with film thickness.
Article
Materials Science, Multidisciplinary
Changdong Yin, Yiwen Wu, Zhou Xu, Dongdong Ye, Jun Yao, Jianjun Chen, Qiang Liu, Xin Ge, Meiling Ding
Summary: This study proposed a new strategy to indirectly estimate the hydrogen diffusivity of metallic materials under tensile stress by combining the electrochemical hydrogen permeation test (EHPT), the hydrogen diffusion descriptive equation based on Fick's law, and hydrogen pre-charged tensile test. The results showed that the hydrogen permeation curve obtained was highly approximate to the theoretical trend. The hydrogen embrittlement (HE) susceptibility of the specimens increased with increasing stress.
Article
Materials Science, Multidisciplinary
Huan Luo, Wei-yi Wang, Xin Yu, Xian-jun Lei, Lang Liu, Guo-zheng Zha, Wen-long Jiang, Bin Yang, Bao-qiang Xu
Summary: Separating selenium and tellurium is a general challenge in material and non-ferrous metallurgical industries. This paper proposes a novel method that achieved efficient separation of selenium and tellurium using gas-liquid equilibrium phase diagram and valence regulation-vacuum gasification technique.
Article
Materials Science, Multidisciplinary
Fan Zhang, Rong Xin Wang, Aiqin Tian, Fangzhi Li, Jianping Liu, Hui Yang
Summary: Deposition of Pd/Pt/Au three-layer films on p-GaN under high and ultra-high vacuum conditions was studied to investigate the electrical contact properties. Linear I-V curves were observed in samples deposited under ultra-high vacuum conditions, while nonlinear I-V characteristics were obtained in samples deposited under high vacuum conditions. The study also found that the samples deposited under high vacuum conditions had higher amounts of oxygen and Pd oxide. The oxide layer had an additional influence on the electrical characteristics of the Pd/Pt/Au/p-GaN contact.
Article
Materials Science, Multidisciplinary
Hongli Liu, Chengzhe Liu, Ying Sui, Zhongxian Liu, Tiangang Zhang, Zhiqiang Zhang, Shuang Sun, Jianwei Jia
Summary: This study utilized polysiloxane and hafnium carbide to produce Si-N-C-O-Hf hybridized ceramic fibers, and obtained ceramic fibers with hemispherical particles on the surface through electrostatic spinning and pyrolysis. The ceramic fibers exhibited excellent thermal stability, oxidation resistance, and high temperature insulation.
Article
Materials Science, Multidisciplinary
M. Abaker, Nazar Elamin Ahmed, A. Saad, H. F. Khalil, E. M. M. Ibrahim, A. M. Adam
Summary: This paper systematically studied the internal structure and thermoelectric properties of In1-xGaxSb alloys prepared by melting synthesis at 1123 K. The results showed that doping with Ga in the In sites led to a significant increase in the Seebeck coefficient and power factor, while reducing the thermal conductivity. The maximum dimensionless figure of merit was observed at 403 K.
Article
Materials Science, Multidisciplinary
Fucheng Yu, Jinlong Ren, Jielin Zhang, Haiyang Chen, Xin Tian, Chenchen Feng, Cuixia Li, Jianbin Zhang, Xianxi Tang, Xiaogang Hou
Summary: An environmentally friendly ZnO@BiVO4 composite photocatalyst was prepared using in-situ self-assembly and solvothermal methods, demonstrating good photocatalytic performance. The mass ratio of BiVO4 and NCZ was found to influence the photocatalytic performance of the composite.
Article
Materials Science, Multidisciplinary
Yaoming Shao, Pingping Zheng, Tianhao Dong, Lianghuan Wei, Haifei Wu, Jianxiao Si
Summary: In this paper, Mg3Bi2 films were prepared on glass substrate using magnetron sputtering, and the phase composition and thermoelectric properties of the films were investigated with different atomic ratios. The films displayed a metastable cubic phase and high conductivity when the atomic ratio exceeded stoichiometry.
Article
Materials Science, Multidisciplinary
I. V. Uimanov, D. L. Shmelev, S. A. Barengolts
Summary: A two-dimensional axisymmetric model has been developed to study the prebreakdown processes in a cathode microprotrusion under an external electric field. The simulation results show that electrohydrodynamic instability leads to the formation of a nanometer-sized conical protrusion on the microprotrusion tip, significantly accelerating the heating process.
Article
Materials Science, Multidisciplinary
Weilun Zhang, Di Yang, Feng Gong, Yongjun Chen, Tian Chen, Zhiwen Xie, Sirui Yang
Summary: A novel Pt doping method was designed to improve the thermal stability of CrWN coating. The doping of Pt atoms effectively blocks the coherent growth of the grains and creates a significant mixing effect, resulting in a smooth surface with uniform element distribution.
Article
Materials Science, Multidisciplinary
Xiaoye Wang, Xiaoguang Yang, Wenna Du, Tao Yang
Summary: In this study, the effects of multiple growth parameters on self-catalyzed growth of InAs/GaSb axial heterostructured nanowires on Si substrate by MOCVD were investigated. It was found that the growth temperature and switching time have significant influences on the nanowire growth.
Article
Materials Science, Multidisciplinary
Weizhong Cui, Yan Zhao, Can Cui, Xing Liu, Beili Pang, Jianguang Feng, Hongzhou Dong, Liyan Yu, Lifeng Dong
Summary: This study introduces Co2+ cations into Cs2AgBiBr6 film to improve its quality, grain size, and conductivity, resulting in enhanced solar cell efficiency.
Article
Materials Science, Multidisciplinary
Jian Wang, Ke Yang, Xianming Cheng, Yalin Lu, Ganghui Wu, Yang Zhang, Yun Kan
Summary: The corrosion behavior and microstructural evolution of Sc microalloyed Al-3.2Cu-1.5Li alloys were investigated in detail. The microstructural results showed higher levels of dislocations density in the Sc microalloyed sample, which resulted in significantly refined grains and T1 precipitates. Microalloying with Sc changed the corrosion mode of the alloy and localized corrosion was found to occur preferentially at the subgrain within unrecrystallized grains with high grain stored energy.
Article
Materials Science, Multidisciplinary
Weifeng Liu, Na Liu, Kaiqiang Song, Meiqin Zeng, Zhongchen Lu
Summary: Monoclinic WO3 prepared through plasma milling exhibits higher photocatalytic activity due to its higher surface area, increased oxygen vacancies, and defects.