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大学生成才的组织行为观
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作者 曹巍 王平 《煤炭高等教育》 2002年第5期30-32,共3页
通过对大学生个体、群体一般行为特征的分析 ,引入组织行为学理论 ,特别是强化理论、激励理论、冲突理论、团队意识和组织干预的内容 ,探寻大学生教育管理的理念和方法。
关键词 组织行为观 大学生 成才 组织行为 高等教育
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Strength and fatigue fracture behavior of Al-Zn-Mg-Cu-Zr(-Sn) alloys 被引量:2
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作者 陈璐 严安 +1 位作者 刘华山 李晓谦 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第10期2817-2825,共9页
The strength and fatigue fracture behavior of A1-Zn-Mg-Cu-Zr(-Sn) alloys were studied by performing tensile tests and fatigue crack propagation (FCP) tests. The microstructures of the experimental alloys were furt... The strength and fatigue fracture behavior of A1-Zn-Mg-Cu-Zr(-Sn) alloys were studied by performing tensile tests and fatigue crack propagation (FCP) tests. The microstructures of the experimental alloys were further analyzed using optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM); phase analysis of these alloys was conducted with an X-ray diffraction (XRD). The results show that when Sn is included, growth of the recrystallization grains in the solution-treated A1-Zn-Mg-Cu-Zr alloy is obstructed, the precipitation-free zone (PFZ) of the overaged A1-Zn-Mg-Cu-Zr-Sn alloy becomes narrow, and the grain boundary precipitates are smaller. Consequently, the FCP resistance is higher. In addition, the overaged Sn-containing alloy has considerably higher tensile strength than the alloy without Sn. 展开更多
关键词 AL-ZN-MG-CU-ZR SN STRENGTH fatigue fracture behavior MICROSTRUCTURE
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Densification and microstructure evolution during SPS consolidation process in W-Ni-Fe system 被引量:2
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作者 胡可 李小强 +1 位作者 杨超 李元元 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第3期493-501,共9页
Spark plasma sintering method (SPS) was used to consolidate mixed W-5.6Ni-1.4Fe (mass fraction, %) powders from commercial fine elemental powders, and both the densification behavior and microstructure evolution i... Spark plasma sintering method (SPS) was used to consolidate mixed W-5.6Ni-1.4Fe (mass fraction, %) powders from commercial fine elemental powders, and both the densification behavior and microstructure evolution in sintering were investigated at different heating rates. The results show that the SPS densification process can be divided into three stages. At the initial unshrinking stage, fast heating generates instantaneous discharge and locally inhomogeneous temperature distribution in solid-state powder particles, enhancing later densification; during the intermediate solid state sintering stage, diffusion is more sufficient in the slow-heated SPS process; at the final transient liquid-phase sintering stage, tungsten grains become sphered and coarsen rapidly, but fast heating helps maintain rather small grain sizes. 展开更多
关键词 densification behavior microstructure evolution SPS W-Ni-Fe alloy
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浅谈企业全面预算管理模式的设计 被引量:3
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作者 李勉 《现代商业》 2008年第18期242-242,241,共2页
随着现代企业制度的建立,预算管理作为企业重要的管理模式已被国内外企业广泛应用,如何设计符合企业自身特点的预算管理模式显得十分重要和迫切。本文从基于产品生命周期性和基于组织行为观入手,设计企业的全面预算管理模式,提升企业的... 随着现代企业制度的建立,预算管理作为企业重要的管理模式已被国内外企业广泛应用,如何设计符合企业自身特点的预算管理模式显得十分重要和迫切。本文从基于产品生命周期性和基于组织行为观入手,设计企业的全面预算管理模式,提升企业的管理水平。 展开更多
关键词 全面预算管理模式 产品生命周期 组织行为观
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Hot deformation behavior and microstructural evolution of Al-Zn-Mg-0.25Sc-Zr alloy during compression at elevated temperatures 被引量:2
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作者 张志野 潘清林 +2 位作者 周坚 刘晓艳 陈琴 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第7期1556-1562,共7页
The hot deformation behavior of Al-Zn-Mg-0.25Sc-Zr alloy and its microstructural evolution were investigated by isothermal axisymmetric hot compression tests at temperatures from 340 to 500°C and strain rates ran... The hot deformation behavior of Al-Zn-Mg-0.25Sc-Zr alloy and its microstructural evolution were investigated by isothermal axisymmetric hot compression tests at temperatures from 340 to 500°C and strain rates ranging from 0.001 to 10 s -1 .The steady flow stress increased with increasing the strain rate or decreasing the deformation temperature,which can be described by a hyperbolic-sine constitutive equation with the deformation activation energy of 150.25 kJ/mol.The tendency of dynamic recrystallization enhanced at high deforming temperatures and low strain rates,which corresponded to low Z values.With decreasing Z value,the main softening mechanism of the alloy transformed from dynamic recovery to dynamic recrystallization, correspondingly,the subgrain size increased and the dislocation density decreased. 展开更多
关键词 Al-Zn-Mg-Sc-Zr alloy hot deformation flow behavior microstructural evolution
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Influence of temperature on tensile behavior and deformation mechanism of Re-containing single crystal superalloy 被引量:5
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作者 刘金来 于金江 +3 位作者 金涛 孙晓峰 管恒荣 胡壮麒 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第7期1518-1523,共6页
Tensile properties of a Re-containing single crystal superalloy were determined within the temperature range from 20 to 1 100 ℃with a constant strain rate of 1.67 ×10^-4 s^-1.From room temperature to 600 ℃,the ... Tensile properties of a Re-containing single crystal superalloy were determined within the temperature range from 20 to 1 100 ℃with a constant strain rate of 1.67 ×10^-4 s^-1.From room temperature to 600 ℃,the yield strength increases slightly with increasing temperature.The yield strength decreases to aminimum at 760 ℃,while a maximum is reached dramatically at 800 ℃.The elongation and area reduction decrease gradually from room temperature to 800 ℃.Above 800 ℃,the yield strength decreases significantly with increasing temperature.The γ' phase is sheared by antiphase boundary (APB) below 600 ℃while elongated SSF (superlattice stacking fault) is left in γ' as debris.At 760 ℃the γ' phase is sheared by a/3 112 superpartial dislocation,which causes decrease of yield strength due to low energy of SSF.Above 800 ℃dislocations overcome γ' through by-passing mechanism. 展开更多
关键词 single crystal superalloy tensile behavior yield strength MICROSTRUCTURE
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Effects of ultrasonic vibration on performance and microstructure of AZ31 magnesium alloy under tensile deformation 被引量:8
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作者 XIE Zhen-dong GUAN Yan-jin +2 位作者 YU Xiao-hui ZHU Li-hua LIN Jun 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第7期1545-1559,共15页
Ultrasonic vibration can reduce the forming force, decrease the friction in the metal forming process and improve the surface quality of the workpiece effectively. Tensile tests of AZ31 magnesium alloy were carried ou... Ultrasonic vibration can reduce the forming force, decrease the friction in the metal forming process and improve the surface quality of the workpiece effectively. Tensile tests of AZ31 magnesium alloy were carried out. The stress–strain relationship, fracture modes of tensile specimens, microstructure and microhardness under different vibration conditions were analyzed, in order to study the effects of the ultrasonic vibration on microstructure and performance of AZ31 magnesium alloy under tensile deformation. The results showed that the different reductions of the true stress appeared under various ultrasonic vibration conditions, and the maximum decreasing range was 4.76%. The maximum microhardness difference among the 3 nodes selected along the specimen was HV 10.9. The fracture modes, plasticity and microstructure of AZ31 magnesium alloy also were affected by amplitude and action time of the ultrasonic vibration. The softening effect and the hardening effect occurred simultaneously when the ultrasonic vibration was applied. When the ultrasonic amplitude was 4.6 μm with short action time, the plastic deformation was dominated by twins and the softening effect was dominant. However, the twinning could be inhibited and the hardening effect became dominant in the case of high ultrasonic energy. 展开更多
关键词 ultrasonic vibration tensile test AZ31 magnesium alloy plastic behavior MICROSTRUCTURE
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Effect of ageing process on microstructure, corrosion behaviors and mechanical properties of Al-5.6Zn-1.6Mg-0.05Zr alloy 被引量:2
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作者 SHAO Hong-bang HUANG Yuan-chun WANG Yan-ling 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第3期1029-1040,共12页
The influence of different ageing processes on the microstructure, corrosion behaviors and mechanical properties of extruded Al-5.6Zn-1.6Mg-0.05Zr(wt.%) alloy was studied in this work. The changes of morphology, size ... The influence of different ageing processes on the microstructure, corrosion behaviors and mechanical properties of extruded Al-5.6Zn-1.6Mg-0.05Zr(wt.%) alloy was studied in this work. The changes of morphology, size and distribution of MgZn_(2)precipitate with ageing temperature and time were revealed by optical and electron microscopy. Intergranular corrosion(IGC) and exfoliation corrosion(EXCO) tests were carried out to assess the changes in corrosion susceptibility of the tempered alloy, and some white spots on the surface of the sample aged for longer time were found to be precursors of pits. Electrochemical cyclic polarization test depicted the corrosion behavior under different tempers. Ageing influences on the mechanical behaviors of the alloy were revealed by evaluating its microhardness and tensile strength. The microscopic features of the strengthening phases determined by the ageing procedure directly affect the corrosion resistance and mechanical properties of the alloy. 展开更多
关键词 Al-Zn-Mg alloy MICROSTRUCTURE corrosion behavior mechanical properties ageing process
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Creep aging behavior and performance of Al-Zn-Mg-Cu alloys under different parameters in retrogression aging treatment 被引量:7
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作者 PENG Nan-hui ZHAN Li-hua +4 位作者 MA Bo-lin WANG Qing XU Ling-zhi YUWen-fang SHEN Feng 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第3期986-998,共13页
A study was conducted to better understand how different parameters, namely, regression aging time and regression aging temperature, affect the creep aging properties, i.e., the creep deformation and performance of Al... A study was conducted to better understand how different parameters, namely, regression aging time and regression aging temperature, affect the creep aging properties, i.e., the creep deformation and performance of Al-Zn-MgCu alloy during regressive reaging. The corresponding creep strain and mechanical properties of samples were studied by conducting creep tests and uniaxial tensile tests. The electrical conductivity was measured using an eddy-current conductivity meter. The microstructures were observed by transmission electron microscopy(TEM). With the increase in regression aging time, the steady creep strain first increased and then decreased, and reached the maximum at 45 min.The steady creep strain increased with the increase in regression aging temperature, and reached the maximum at 200 ℃.The level of steady creep strain was determined by precipitation and dislocation recovery. Creep aging strengthens 7B50-RRA treated with regression aging time at 190 ℃ for 10 min, and the difference in the mechanical properties of alloy becomes smaller. The diffusion of solute atoms reduces the scattering of electrons, leading to a significant improvement in electrical conductivity and stress corrosion cracking(SCC) resistance after creep aging. The findings of this study could help in the application of creep aging forming(CAF) technology in Al-Zn-Mg-Cu alloy under RRA treatment. 展开更多
关键词 Al-Zn-Mg-Cu alloy retrogression parameters creep aging behavior performance MICROSTRUCTURE
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Effect of hot extrusion on microstructure and tribological behavior of Al_(2)O_(3p) reinforced 7075 aluminum-matrix composites 被引量:4
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作者 LEI Yu-shun YAN Hong +4 位作者 WEI Zhi-fan XIONG Jun-jie ZHANG Peng-xiang WAN Jian-ping WANG Zhi-lu 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第8期2269-2284,共16页
The effects of hot extrusion and addition of Al_(2)O_(3p) on both microstructure and tribological behavior of 7075 composites were investigated via optical microscopy(OM),scanning electron microscopy(SEM),energy dispe... The effects of hot extrusion and addition of Al_(2)O_(3p) on both microstructure and tribological behavior of 7075 composites were investigated via optical microscopy(OM),scanning electron microscopy(SEM),energy dispersive spectrometry(EDS),and transmission electron microscopy(TEM).The experimental consequences reveal that the optimal addition of Al_(2)O_(3p) was 2 wt%.After hot extrusion,the Mg(Zn,Cu,Al)2 phases partially dissolve into the matrix and generate many uniformly distributed aging precipitation particles,the Al_(7)Cu_(2)Fe phases are squeezed and broken,and the Al_(2)O_(3p) become uniform distribution.The microhardness of as-extruded 2 wt%Al_(2)O_(3p)/7075 composites reaches HV 170.34,increased by 41.5%than as-cast composites.The wear rate of as-extruded 2 wt%Al_(2)O_(3p)/7075 composites is further lower than that of as-cast composites under the same condition.SEM-EDS analyses reveal that the reinforced wear resistance of composites can put down to the protective effect of the Al_(2)O_(3p) reinforced transition layer.After hot extrusion,the transition layer becomes stable,which determines the reinforced wear resistance of the as-extruded composites. 展开更多
关键词 7075 alloy AL2O3P COMPOSITES hot extrusion MICROSTRUCTURE tribological behavior
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Influence of temperature on creep behavior,mechanical properties and microstructural evolution of an Al-Cu-Li alloy during creep age forming 被引量:2
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作者 ZHOU Chang ZHAN Li-hua +2 位作者 LI He ZHAO Xing HUANG Ming-hui 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第8期2285-2294,共10页
The effect of temperature in range of 155-175 ℃ on the creep behavior, microstructural evolution, and precipitation of an Al-Cu-Li alloy was experimentally investigated during creep ageing deformation under 180 MPa f... The effect of temperature in range of 155-175 ℃ on the creep behavior, microstructural evolution, and precipitation of an Al-Cu-Li alloy was experimentally investigated during creep ageing deformation under 180 MPa for 20 h. Increasing temperature resulted in a noteworthy change in creep ageing behaviour, including a variation in creep curves, an improvement in creep rate during early creep ageing, and an increased creep strain. Tensile tests indicate that the specimen aged at higher temperature reached peak strength within a shorter time. Transmission electron microscopy(TEM) was employed to explore the effect of temperature on the microstructural evolution of the AA2198 during creep ageing deformation. Many larger dislocations and even tangled dislocation structures were observed in the sample aged at higher temperature. The number of T1 precipitates increased at higher ageing temperature at the same ageing time. Based on the analysed results, a new mechanism, considering the combined effects of the formation of larger dislocation structures induced by higher temperature and diffusion of solute atoms towards these larger or tangled dislocations, was proposed to explain the effect of temperature on microstructural evolution and creep behaviour. 展开更多
关键词 Al-Cu-Li alloys creep age forming mechanical properties MICROSTRUCTURE PRECIPITATION
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Effect of Li addition on mechanical properties and ageing precipitation behavior of extruded Al-3.0 Mg-0.5 Si alloy 被引量:3
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作者 YANG Xiao-kun XIONG Bai-qing +6 位作者 LI Xi-wu YAN Li-zhen LI Zhi-hui ZHANG Yong-an LI Ya-nan WEN Kai LIU Hong-wei 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第9期2636-2646,共11页
The effect of Li(2.0 wt%)addition on mechanical properties and ageing precipitation behavior of Al-3.0 Mg 0.5 Si was investigated by tensile test,dynamic elasticity modulus test,scanning electron microscopy(SEM),trans... The effect of Li(2.0 wt%)addition on mechanical properties and ageing precipitation behavior of Al-3.0 Mg 0.5 Si was investigated by tensile test,dynamic elasticity modulus test,scanning electron microscopy(SEM),transmission electron microscopy(TEM)and high-resolution transmission electron microscopy(HRTEM)images.The results show that the tensile strength of the Li-containing alloy can be significantly improved;however,the ductility is sharply decreased and the fracture mechanism changes from ductile fracture to intergranular fracture.The elasticity modulus of the Li-containing alloy increases by 11.6%compared with the base alloy.The microstructure observation shows that the Li addition can absolutely change the precipitation behavior of the base alloy,andδ′-Al_(3)Li phase becomes the main precipitates.Besides,β′′-Mg_(2)Si andδ′-Al_(3)Li dual phases precipitation can be visibly observed at 170℃ ageing for 100 h,although the quantity ofδ′-Al_(3)Li phase is more thanβ′′-Mg_(2)Si phase.The width of the precipitate-free zone(PFZ)of the Li-containing alloy is much wider at the over-ageing state than the base alloy,which has a negative impact on the ductile and results in the decrease of elongation. 展开更多
关键词 Al-3.0 Mg-0.5 Si alloy Li addition microstructure ageing behavior mechanical properties dynamic elasticity modulus
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Deformation behaviour and microstructure evolution of AlMg6Mn alloy during shear spinning 被引量:5
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作者 Lj.RADOVIC M.NIKACEVIC B.JORDOVIC 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第5期991-1000,共10页
Deformation behavior and microstructure of AlMg6Mn alloy subjected to shear spinning were studied by means of mechanical characterization, optical and SEM+EDS microscopy. Specimens were shear spun on an industrial sp... Deformation behavior and microstructure of AlMg6Mn alloy subjected to shear spinning were studied by means of mechanical characterization, optical and SEM+EDS microscopy. Specimens were shear spun on an industrial spinning machine using different mandrels, providing reductions of wall thickness of 30%, 50% and 68%. The grain structure developed during shear spinning refines gradually. The grains elongate in axial direction with increase of reduction, and also stretches along circumferencial direction. Optimal combination of strength and elongation is observed. This is attributed to grain refinement and dislocation reactions with particles and atoms of Mg and Mn in solid solution. 展开更多
关键词 AlMg6Mn alloy shear spinning microstructure evolution deformation behaviour serrated yielding
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Effects of Cu on Microstructure and Corrosion Behaviour of Hot-Rolled Mg-3Zn-1Y Alloys
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作者 Zhang Yuezhong Chen Xiaoting +3 位作者 Shen Jing Wu Pengpeng Zhang Shaohua Liu Baosheng 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2024年第10期2794-2804,共11页
The microstructure and corrosion behaviour of hot-rolled Mg-3Zn-1Y-xCu alloys(x=0,1,3,5,wt%)were investigated.Results show that all Mg-3Zn-1Y-xCu alloys mainly consist ofα-Mg matrix and Mg_(3)Zn_(6)Y phases.The addit... The microstructure and corrosion behaviour of hot-rolled Mg-3Zn-1Y-xCu alloys(x=0,1,3,5,wt%)were investigated.Results show that all Mg-3Zn-1Y-xCu alloys mainly consist ofα-Mg matrix and Mg_(3)Zn_(6)Y phases.The addition of Cu element promotes the formation of MgZnCu phase,and the amount of MgZnCu phase is increased with the increase in Cu content.Electrochemical and immersion test results show that the corrosion resistance of Mg-3Zn-1Y-xCu alloys is deteriorated after Cu addition,which can be attributed to the influence of the microstructure of alloys and the properties of the formed corrosion product film.The MgZnCu phase with high electrochemical potential accelerates the micro-galvanic corrosion as strong cathodic sites,and the decreased protection effect of the corrosion product film results from the variation in PBR value of the related compounds. 展开更多
关键词 corrosion behaviour magnesium alloy MICROSTRUCTURE MgZnCu phase corrosion product
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