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961.
962.
Effect of Isothermal Forging on the Microstructure and Mechanical Properties of Mg-8Gd-3Y-0.5Zr Alloy 下载免费PDF全文
HOU Xiangwu WANG Yanbo ZHOU Haitao SUN Xin GONG Zhengxuan JIANG Shanyao XIAO Lü 《上海航天》2022,39(1):186-195
Aiming at the problems of poor plastic forming ability, narrow forging temperature range, and strain rate sensitivity of rare earth magnesium alloys, a study on the microstructure and mechanical properties of Mg-8Gd-3Y-0.5Zr alloy with different isothermal forging processes is carried out. The microstructure and properties of the alloy in the as-cast, isothermal forged, and post-aging states after forging are studied with optical microscope (OM), scanning electron microscope (SEM), and tensile testing. The results show that significant dynamic recrystallization occurs during the isothermal forging process, a fine equiaxed grain structure is formed, and the mechanical properties of the alloy are greatly improved. When the isothermal forging temperature is 460 ºC and the strain rate is 0.02 s-1, the alloy structure performance is the best, the room temperature tensile yield strength (TYS) is 218 MPa, the ultimate tensile strength (UTS) is 299 MPa, and the fracture elongation (FE) is 19.2%. When the alloy is post-forging artificial aged, the α-Mg matrix is dispersed, the Mg5(Gd,Y) phase is precipitated, the UTS of the alloy is increased to 392 MPa, and the FE is reduced to 12.0%. 相似文献
963.
《中国航空学报》2023,36(2):213-228
Motor drives form an essential part of the electric compressors, pumps, braking and actuation systems in the More-Electric Aircraft (MEA). In this paper, the application of Machine Learning (ML) in motor-drive design and optimization process is investigated. The general idea of using ML is to train surrogate models for the optimization. This training process is based on sample data collected from detailed simulation or experiment of motor drives. However, the Surrogate Role (SR) of ML may vary for different applications. This paper first introduces the principles of ML and then proposes two SRs (direct mapping approach and correction approach) of the ML in a motor-drive optimization process. Two different cases are given for the method comparison and validation of ML SRs. The first case is using the sample data from experiments to train the ML surrogate models. For the second case, the joint-simulation data is utilized for a multi-objective motor-drive optimization problem. It is found that both surrogate roles of ML can provide a good mapping model for the cases and in the second case, three feasible design schemes of ML are proposed and validated for the two SRs. Regarding the time consumption in optimizaiton, the proposed ML models can give one motor-drive design point up to 0.044 s while it takes more than 1.5 mins for the used simulation-based models. 相似文献