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Fu‑Hao Gao,Bin‑Jiang Lv,Tie‑Wei Xu,Ning Cui,Feng Guo 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.11
The effects of low Sn (1.0 wt%) and Mn (0.5 wt%) content on the microstructures and mechanical properties of as-extrudedMg–2Al–1Zn (AZ21) alloys were systematically investigated. The combined addition of Sn and Mn significantly refinedthe grains of the AZ21 alloy, reducing the average grain size from 25.77 to 2.17 μm. The volume fraction of the dynamicallyrecrystallized (DRXed) grains decreased from 78.49 to 43.81% with Sn (1.0 wt%) and Mn (0.5 wt%) addition. The Al8Mn5,Al11Mn4,and Al9Mn4phases were formed in Mg–2Al–1Zn–1Sn–0.5Mn (AZTM2110) alloy, and the Mg17Al12phase disappeared. The orientation relationship between Al9Mn4and Al11Mn4was (002)Al11Mn4//(̄ 302)Al9Mn4, [ ̄ 100]Al11Mn4//[223]Al9Mn4,and the orientation relationship between Al8Mn5and α-Mg was ( ̄ 252)Al8Mn5//(̄ 12̄ 13)α−Mg. The Al9Mn4and Al11Mn4phasesgrew in the same direction. The intensity of basal fiber texture of AZTM2110 alloy decreased by 21.7%. The ultimatetensile strength, yield strength, and elongation of the AZ21 alloy increased by 29.03%, 65.05%, and 61.02%, respectively. Grain-refinement strengthening was the main mechanism underlying the improvement in AZTM2110 alloy strength. Grainrefinement and the weakened basal fiber texture improved the plasticity of the AZTM2110 alloy.
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Gao Hao,Cui Jun-fu 중국지역학회 2016 중국지역연구 Vol.3 No.2
Any economic and social activities are inseparable from a specific area, and in different regions often mean different development policies. China attaches great importance to the division of the region to a certain area in order to develop targeted policies. Currently, all provinces in China are divided into eastern, central, and western regions, 11 provinces in eastern region, 12 provinces in western region, and 8 provinces in central region. Since the founding, especially since the reform and opening up, China’s regional policy has undergone so many alternates between comprehensive development and focusing development, each policy adjustments have had a significant impact on the development of the relation region. Compared to the current administrative division, this article uses clustering methods to classify China provinces, and support vector machine for testing. The study found that three regions administrative division of China currently used cannot adapt to the actual development of the current situation, we must make the appropriate adjustments in order to provide a basis for the development of more targeted regional policy. 任何经济社会活动都离不开特定的区域, 处于不同的区域往往意味着不同的发展政策。为增强宏观调控的有效性, 在中国的经济社会发展中非常重视将某一个地区划分到一类区域当中, 从而对该区域制定有针对性的政策。目前, 中国将所有省份分为东部、中部、西部三个区域, 东部11个省份, 西部12个省份, 中部8个省份。建国以来, 特别是改革开放以来, 中国的区域政策经历了重点发展、全面发展、重点发展与全面发展相结合等多次政策交替变换, 每次政策调整均对相应区域的发展产生了重大影响。本文使用聚类方法对中国省份进行了分类, 与目前东中西行政区域划分进行对比分析, 并使用支持向量机进行检验。研究发现, 中国目前采用的东中西行政区域划分已经不能适应目前的实际发展状况, 必须进行相应的调整, 以便为制定更有针对性的区域政策提供参考。
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Qiang Xie,Hao Gao,Yuxin Ban,Xiang Fu,Xiaowen Liang,Zhilin Cao,Jun Duan 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.11
To figure out the influence of soft-hard layer thickness ratio on specimens’ mechanical properties evolution and microcracking mechanism, combined with digital image correlation technology and acoustic emission facility, uniaxial compression tests were conducted on soft-hard interbedded rock-like materials considering seven bedding dip angles and two soft-hard layer thickness ratios. The results are as follows: 1) The failure mode and failure pattern of layered rock masses are mainly determined by the bedding dip angle α and are less related to the soft-hard thickness ratio. With the increase of dip angle, the failure strength curve of the specimen is approximately U-shaped, and the soft-hard layer thickness ratio affects the U-shaped. The decrease in soft-hard layer thickness ratio will reduce the uniaxial compressive strength of specimens with low dip angles (α≦30°), cause differences in the evolution path of local strain fields of layered rock masses and reduce the horizontal displacement of the main crack. 2) The increase of the proportion of soft layer in the soft-hard layer thickness ratio will reduce the proportion of tensile cracks in the tensile failure specimens and shear cracks in the shear failure specimens, complicating the process of cracks of the layer rock mass. 3) Increasing the proportion of soft layers in the soft-hard layers thickness ratio promotes the generation of secondary cracks in layered rock masses and further reduces the integrity of specimens. Finally, through the findings in this paper, it can provide a reference for analyzing the crack propagation behavior of layered rock.
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Zhan-Li Shi,Dao-Hui Xiang,Hao-Ren Feng,Bang-Fu Wu,Zhi-Meng Zhang,Guo-Fu Gao,Bo Zhao 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.10
SiCp/Al composites have been widely used in many fields due to their excellent mechanical properties. However, the addition of reinforced phase SiC particles makes the overall properties of the composites hard and brittle, which brings great challenges to milling. Ultrasonic vibration-assisted processing technology has great advantages in processing hard and brittle materials. However, the process of rupture of SiC particles cannot be effectively observed during the test processing, and a large number of tests increase the cost of the test. The combination of finite element analysis and experiment was used to study the machining performance of High-volume fraction SiCp/Al composites in longitudinal-torsional ultrasonicassisted milling (LTUAM), and its feasibility was evaluated by comparing with conventional Milling (CM). By analyzing the trajectories of cutting edges in ultrasonic-assisted milling, It was found that ultrasonic frequency determines the time of periodic contact-separation between chisel edge and workpiece, and ultrasonic amplitude determines the maximum distance of contact-separation. Using ABAQUS finite element software, a polygon SiC particles model with a high-volume fraction was established to investigate the SiC particles crushing process under different ultrasonic-assisted milling conditions. The results showed that high-frequency ultrasonic-assisted milling could soften SiCp/Al composites, and the structural integrity of silicon carbide particles could be better maintained under appropriate ultrasonic amplitudes, reducing the probability of fragmentation. The removal mode was mainly plastic removal or crushing into small particles. The surface roughness value and milling force were reduced, improving the surface quality of the processed composite material. The conclusions of the milling test were basically consistent with the simulation results, which prove the correctness and feasibility of the simulation results
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