期刊：
Journal of Materials Engineering and Performance,2023年32(16):7363-7371 ISSN：1059-9495
通讯作者：
Bin Jiang<&wdkj&>Yuan Yuan
作者机构：
[Zhao, Jun; He, Xia; Liu, Yang; Xiao, Baijun; Chen, Ganxin] Hunan City Univ, Sch Mech & Elect Engn, Yiyang 413002, Peoples R China.;[Jiang, Bin; Yuan, Yuan; Yuan, Ming; Pan, Fusheng] Chongqing Univ, Coll Mat Sci & Engn, Natl Engn Res Ctr Magnesium Alloys, Chongqing 400044, Peoples R China.;[Xu, Jun] Guangdong Acad Sci, Inst New Mat, Guangzhou 510650, Peoples R China.;[Yuan, Ming] Hubei Engn Univ, Sch Chem & Mat Sci, Xiaogan 432000, Peoples R China.
通讯机构：
[Bin Jiang; Yuan Yuan] N;National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing, China<&wdkj&>National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing, China
关键词：
Mg-Gd alloy;mechanical properties;texture;Zn and Ca co-additions
摘要：
The effects of combined addition of Zn and Ca to Mg-1Gd alloy (Mg-1Gd-1.5Zn-1Ca wt.%) on its microstructure and mechanical properties were studied. The results showed that the fine and coarse Mg2Ca and Ca2Mg6Zn3 phase particles were formed in the matrix by the combined additions of Zn and Ca. A drastic refinement of dynamic recrystallized grains was observed in the extruded Mg-1Gd-1.5Zn-1Ca alloy sheet. A remarkable yield strength enhancement and minor ductility decrement have been observed, where strength remarkably increases from 73 to 153 MPa along ED and from 119 to 182 MPa along TD and the ductility decreases from 25.1 to 18.8% along ED and from 13.6 to 9.8% along TD. The SEM and TEM analysis showed that the formed high-density fine Mg2Ca and Ca2Mg6Zn3 particles and the co-segregations of Ca and Zn in grain boundaries led to the fine structure and the strength enhancement.
作者机构：
[刘康; 李彬; 苏盛] Hunan Key Laboratory of Smart Grid Operation and Control, Changsha University of Science and Technology, Changsha;410114, China;[刘鑫] Marketing Service Center of State Grid Hunan Electric Power Company (Metering Center), Changsha;[张蓬鹤; 薛阳] China Electric Power Research Institute Co., Ltd., Beijing;100180, China
通讯机构：
[Su, S.] H;Hunan Key Laboratory of Smart Grid Operation and Control, China
作者机构：
[Xu, Jun; Zheng, Kaihong; Pan, Fusheng] Guangdong Acad Sci, Inst New Mat, Guangzhou 510650, Peoples R China.;[Xu, Jun; Zhang, Weiwen] South China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Metall M, Guangzhou 510641, Peoples R China.;[Jiang, Bin; Pan, Fusheng] Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Mech Transmiss, Chongqing 400044, Peoples R China.;[Zhao, Jun] Hunan City Univ, Sch Mech & Elect Engn, Yiyang 413002, Peoples R China.;[Xu, Jun] Chang Xing St 363, Guangzhou, Peoples R China.
通讯机构：
[Xu, J ] C;[Jiang, B ] S;Sha Zheng St 174, Chongqing, Peoples R China.;Chang Xing St 363, Guangzhou, Peoples R China.
作者机构：
[Zhao, Jun] Hunan City Univ, Sch Mech & Elect Engn, Yiyang 413002, Peoples R China.;[Jiang, Bin; Yuan, Ming; Huang, Guangsheng; Pan, Fusheng] Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Mech Transmission, Chongqing 400044, Peoples R China.;[Wang, Qinghang] Yangzhou Univ, Sch Mech Engn, Yangzhou 225127, Jiangsu, Peoples R China.;[Chai, Yanfu] Shaoxing Univ, Sch Mech & Elect Engn, Shaoxing 312000, Peoples R China.
通讯机构：
[Bin Jiang] S;State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing, China
摘要：
Li addition is verified to be an effective method to increase the room temperature ductility and formability of Mg alloys. In the present study, the microstructure, texture, and tensile properties of the extruded Mg-1Zn-xLi (wt%, x = 0, 1, 3, 5) alloy sheets were studied by X-ray diffraction (XRD), scanning electron microscope (SEM), and electron backscatter diffraction (EBSD). It was found that Li addition resulted in the grain coarsening and the development of new transverse direction (TD)-tilting and 〈
$$10\bar{1}0$$
〉 parallel to extrusion direction textures, which was related to the improved dynamic recrystallization and the increased prismatic slip during extrusion. The Mg-1Zn−5Li sheet showed the weakest texture, which contained both basal and TD-tilting oriented grains. No additional phase was formed with Li addition. The yield strength of Mg-1Zn-xLi sheets gradually decreased with increasing Li content, which was mainly related to the grain coarsening and texture weakening. In addition, the ductility of the Mg-1Zn-xLi sheet was remarkably enhanced by Li addition. The elongation of the Mg-1Zn-5Li sheet was 30.3% along the TD, which was three times than that of Mg-1Zn sheet. Microstructural analysis implied that this significant ductility enhancement was associated with the improvement activation of prismatic and basal slips during the tensile tests. This study may provide insights into the development of high-ductility, low-density Mg-Zn-Li based alloys.
摘要：
The Mg-3Li alloy has been extruded at different temperatures (extrusion temperatures of 240 degrees C, 270 degrees C, 300 degrees C, 330 degrees C, 370 degrees C) and the microstructure, texture and tensile properties of the extruded sheet are investigated. Results show that the average grain size increases, the basal texture weakens with the increase of extrusion temperature and the development of a transverse direction (TD)-split texture. The highest grain size, the weakest basal texture and the strongest TD-split texture are developed in the alloy extruded at 370 degrees C. This may be associated with enhancement of prismatic slip activity. The alloy extruded at 240 degrees C exhibits the highest yield strength because of the fine grain structure and strong basal texture. The alloy extruded at 370 degrees C in tension along the TD has the highest ductility, which is associated with the weakened basal texture and the formation of a TD-split texture.
作者机构：
[Zhai, Haowei; Xia, Hongbo] School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China;[Liu, Lintao; Jiang, Bin; Pan, Fusheng] National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China;[Zhao, Jun] School of Mechanical and Electrical Engineering, Hunan City University, Yiyang 413002, China;[Chen, Daolun] Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, ON M5B 2K3, Canada;[Wang, Qinghang] School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China<&wdkj&>National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China
通讯机构：
[Qinghang Wang] S;[Bin Jiang] N;National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China<&wdkj&>School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China<&wdkj&>National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China
摘要：
Designing and developing the Mg alloys with low cost and high performance is of the great significance. Novel Mg-1Bi-xMn (x = 0, 1 and 2 wt.%) extruded alloys, in this work, were fabricated at different extrusion temperatures (220, 250 and 300 °C). The effects of extrusion temperature and Mn addition on the microstructures and mechanical properties of extruded alloys at room temperature were investigated. The results showed that decreasing the extrusion temperature could refine the average grain size, weaken the basal fiber texture intensity and improve the microstructural homogeneity of extruded alloys. When the Mn element was added to the Mg-1Bi alloy, the average grain size further reduced. Simultaneously, the number fraction of low angle grain boundaries (LAGBs) increased, along with the occurrence of regions without dynamic recrystallization (unDRX). The combined effects of grain refinement and coarse unDRXed structure made the textures of the extruded Mg-1Bi-xMn alloys never obviously change. Besides few large size un-dissolved second phases, fine Mg3Bi2 and α-Mn phases were precipitated in the extruded Mg-1Bi-xMn alloys and partial nano-scale α-Mn particles pined at grain boundaries (GBs) to effectively impede the migration of GBs for grain refinement. Microstructural variations determined the extruded Mg-1Bi-2Mn alloy to exhibit the highest yield strength of ∼ 319.2 MPa with the appropriate elongation-to-failure of ∼ 13% at the extrusion temperature of 220 °C, and they enabled the extruded Mg-1Bi-1Mn alloy to show the highest elongation-to-failure of ∼ 26% without the obvious loss of yield strength of ∼ 252.1 MPa.
作者机构：
[魏文; 戴双凤] School of Economics and Management, Changsha University of Science and Technology, Changsha;410076, China;School of Economics and Management, Hunan University of Science and Technology, Yueyang;414000, China;[姜飞; 陈磊] School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha
摘要：
The influence of Mn content on the microstructure, tensile properties and strain-hardening behaviors of extruded Mg-1Gd-0.5Zn-xMn (x=0, 0.3 and 1, wt.%) alloy sheets was investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), and electron backscatter diffraction (EBSD). The results show that the completely recrystallized grain structure and the extrusion direction (ED)-titling texture are observed in all the extruded sheets. The mean grain size and weakened ED-titling texture of the extruded sheets are gradually reduced with increasing Mn content. This is primarily associated with the formation of new fine a-Mn particles by Mn addition. Tensile properties show that the addition of Mn also leads to the improvement of yield strengths, ultimate tensile strengths and elongations of the extruded Mg-1Gd-0.5Zn-xMn sheets, which is mainly due to the fine grains and alpha-Mn particles. In addition, the Mg-1Gd-0.5Zn-1Mn sheet has the lowest strain-hardening exponent and the best hardening capacity among all prepared Mg-1Gd-0.5Zn-xMn sheets.
摘要：
Microstructure, texture and mechanical properties of extruded Mg-xGd sheets (x = 1.0, 1.5, 2.0 and 2.5 wt%) were discussed, and microstructural evolution of an Mg-1.0Gd alloy during extrusion were investigated. The extruded Mg-xGd sheets presented a fully recrystallized microstructure. The texture with [112 over line 1]-[202 over line 1] double fibre orientations was observed in all the extruded sheets, and texture weakening was observed with increasing Gd content. With an increase in Gd content, the tensile strength of the sheets gradually increased mainly due to the fine grain size and more Gd atoms, and an increase in ductility was related to the fine grain size, more Gd atoms and higher Schmid factor for basal slip. During extrusion, the development of compression twins and {101 over line 1}-{101 over line 2} double twins played a key role in the formation of [112 over line 1]-[2021] double fibre texture. Fine recrystallized grains having an unusual texture with [112 over line 1]-[202 over line 1] double fibre orientation preferentially formed in the undynamically recrystallized matrix with [101 over line 0] fibre orientation via continuous dynamically recrystallization and have grown along well-defined bands. Further extrusion deformation resulted in a fully recrystallized microstructure with an unusual texture.
作者：
Lixiong Li*;Tongguang Yang;Yueyang Yuan;Zhenhua Cai
期刊：
IET Generation, Transmission and Distribution,2022年16(17):3451-3461 ISSN：1751-8687
通讯作者：
Lixiong Li
作者机构：
Key Laboratory Energy Monitoring and Edge Computing for Smart City of Hunan Province, Yiyang, China;School of Mechanical and Electrical Engineering, Hunan City University, Yiyang, China;[Lixiong Li; Tongguang Yang; Yueyang Yuan; Zhenhua Cai] Key Laboratory Energy Monitoring and Edge Computing for Smart City of Hunan Province, Yiyang, China<&wdkj&>School of Mechanical and Electrical Engineering, Hunan City University, Yiyang, China
通讯机构：
[Lixiong Li] K;Key Laboratory Energy Monitoring and Edge Computing for Smart City of Hunan Province, Yiyang, China<&wdkj&>School of Mechanical and Electrical Engineering, Hunan City University, Yiyang, China
摘要：
The battery energy stored quasi-Z-source (BES-qZS) based photovoltaic (PV) power generation system combines advantages of the qZS inverter and the battery energy storage (BES) system. To realize multi-objective cooperative control, a model predictive control (MPC) strategy for the PV grid-connected system based on an energy-storage quasi-Z source inverter (ES-qZSI) is proposed. The energy storage battery is added to the traditional quasi-Z source inverter (qZSI). The MPC strategy is adopted to realize maximum power point tracking (MPPT), battery, and point of common coupling (PCC) tripartite energy control in a single-stage conversion system. The discrete-time model of ES-qZSI is derived, and the cost function was constructed by using the system state variables. The PV power MPPT module, the battery power management module, and the PCC power module are designed to generate the reference signal of the prediction function. Finally, the proposed algorithm was validated by simulation. The theoretical analysis and simulation results were consistent.
