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Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 577-585页

作者： Fanjing Meng Wenbo Du Ning Ding Jian Sun Xian Du Ke liu shubo li College of Materials Science and Engineering Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China

The hybrid of carbon nanotube(CNT)and reduced graphene oxide(RGO)reinforced ZK61 composite was fabricated by a hot extrusion *** with the raw ZK61 alloy and single-reinforced composites,the hybrid-reinforced by RGO+CNT complex exhibited significant enhancements both in mechanical and thermal *** adjusting the proportion of RGO and CNT in ZK61 alloy,the obtained optimum ZK61/(0.06 wt%RGO+0.54 wt%CNT)composite exhibited increase of 25.4%in yield strength,26.5%in ultimate tensile strength,104%in failure strain and 30.4%in thermal conductivity,respectively,in comparison with ZK61 *** superior properties of the nano-hybrid composite are attributed to the synergetic effects of RGO and CNT,leading to a uniform dispersion and integrated structure as well as the enhanced interfacial bonding with *** strengthening ability of RGO and CNT was calculated to quantify their individual contribution to the improvement in mechanical and thermal properties of the ZK61 matrix *** RGO+CNT hybrids provide a promising way to develop Mg matrix composites with impressive performances.

关键词： Mg matrix composite Carbon nanotube Reduced graphene oxide Mechanical performance Thermal conductivity

Effects of deformation temperatures on microstructures,aging behaviors and mechanical properties of Mg-Gd-Er-Zr alloys fabricated by hard-plate rolling

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Journal of Magnesium and Alloys 2024年第6期12卷 2345-2359页

作者： Ke liu Dalong Hu Feng Lou Zijian Yu shubo li Xian Du Wenbo Du Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China

In this investigation,a high-strength Mg-12Gd-1.0Er-0.5Zr(wt.%)alloy sheet was produced by hot extrusion(HE)and subsequent hard-plate rolling(HPR)at different *** results indicate that the microstructures of these final-rolled sheets are inhomogeneous,mainly including coarse deformed grains and dynamic recrystallized(DRXed)grains,and the volume fraction of these coarse deformed grains increases as the rolling temperature ***,more DRXed grains can be found in R-385℃sheet,resulting in a smaller average grain size and weaker basal texture,while the biggest grains and the highest strong basal texture are present in R-450℃*** of dynamic precipitation ofβphases which are mainly determined by the rolling temperature are present in these sheets,and its precipitation can consume the content of Gd solutes in the *** a result,the lowest number density ofβphase in R-450℃sheet is beneficial to modify the age hardening ***,the R-450℃sheet displays the best age hardening response because of a severe traditional precipitation ofβ’(more)andβH/βM(less)precipitates,resulting in a sharp improvement in strength,*** tensile strength(UTS)of∼518±17 MPa and yield strength(YS)of∼438±18 ***,the elongation(EL)of this sheet reduces greatly,and its value is∼2.7±0.3%.By contrasting,the EL of the peak-aging R-385℃sheet keeps better,changing from∼4.9±1.2%to∼4.8±1.4%due to a novel dislocation-induced chain-like precipitate which is helpful to keep good balance between strength and ductility.

关键词： Mg-Gd-Er-Zr sheets Age hardening response Precipitates Mechanical properties

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医疗美容纠纷中请求权竞合的诉讼路径研究

医学与法学 2024年第4期16卷 112-119页

作者：张娜李抒波山西大学山西太原030006

医疗美容纠纷中存在请求权竞合的现象,其他国家或地区在请求权竞合下的诉讼有“客观预备合并之诉”“客观选择合并之诉”和“客观重叠合并之诉”三种形态;结合我国《民法典》中对于请求权竞合时“择一行使”的解决思路,以及我国医疗美... 详细信息

医疗美容纠纷中存在请求权竞合的现象,其他国家或地区在请求权竞合下的诉讼有“客观预备合并之诉”“客观选择合并之诉”和“客观重叠合并之诉”三种形态;结合我国《民法典》中对于请求权竞合时“择一行使”的解决思路,以及我国医疗美容行业法治建设尚待完善、律师代理匮乏、诉讼资源有限等现实因素,我国应选择“客观预备合并之诉”作为解决医疗美容纠纷的主要诉讼实施路径。

关键词：医疗美容纠纷请求权竞合客观预备合并之诉

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平房仓仓底余粮清扫装置传送及收集仿真研究

食品与机械 2024年第2期40卷 91-96,220页

作者：何颖臻王明旭王巍李淑博河南工业大学机电工程学院河南郑州450001 河南工业大学河南省粮油仓储建筑与安全重点实验室河南郑州450001 中央储备粮滨州直属库有限公司山东滨州256600

目的:验证针对平房仓仓底余粮而设计的清扫装置的传送部分和收集部分结构设计是否合理,并确定装置运行的关键参数,避免造成采购和制造方面的浪费。方法:基于离散元法采用EDEM仿真软件,对传送部分和收集部分的运行效果进行仿真,以洒落率... 详细信息

目的:验证针对平房仓仓底余粮而设计的清扫装置的传送部分和收集部分结构设计是否合理,并确定装置运行的关键参数,避免造成采购和制造方面的浪费。方法:基于离散元法采用EDEM仿真软件,对传送部分和收集部分的运行效果进行仿真,以洒落率为评价参数。结果:在保证传送部分和收集部分都能满足设计要求的情况下,波纹挡边带的最佳运行速度应控制在0.6~0.8 m/s。结论:该余粮清扫装置传送部分和收集部分的结构符合设计要求。

关键词：余粮波纹挡边带 EDEM 物料传送

准噶尔盆地东部凹陷区二叠系上乌尔禾组深层—超深层储层特征及发育模式

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天然气地球科学 2024年第2期35卷 259-274页

作者：王秋玉刘超威闫文琦李树博李辉陈梦娜李宗浩中国石油新疆油田分公司勘探开发研究院新疆克拉玛依834000

选取阜康凹陷和东道海子凹陷作为准噶尔盆地东部凹陷区代表,以二叠系上乌尔禾组深层—超深层砂砾岩储层为研究对象,利用岩心手标本、薄片、扫描电镜观察,结合高压压汞和测井成像等方法,分析深层—超深层砂砾岩储层特征及主控因素,进一... 详细信息

选取阜康凹陷和东道海子凹陷作为准噶尔盆地东部凹陷区代表,以二叠系上乌尔禾组深层—超深层砂砾岩储层为研究对象,利用岩心手标本、薄片、扫描电镜观察,结合高压压汞和测井成像等方法,分析深层—超深层砂砾岩储层特征及主控因素,进一步揭示准噶尔盆地东部凹陷区上乌尔禾组储层发育模式。结果表明:准噶尔盆地东部凹陷区均为深层—超深层砂砾岩储层,其中阜康凹陷属于典型的低孔—特低渗储层,东道海子凹陷则为低孔—低渗储层。二者储集空间类型存在差别,阜康凹陷主要发育微裂缝和溶蚀孔,东道海子凹陷存在大量溶蚀孔,少见裂缝。压实作用和胶结作用对准噶尔盆地东部地区储层均起到了强烈的破坏作用,但阜康凹陷压实作用十分强烈,溶蚀作用弱,超压产生的大量裂缝成为超深层油气运移的有效通道。东道海子凹陷裂缝欠发育,长石和浊沸石经过溶蚀作用产生的大量粒内溶蚀孔改善了储层物性。此外其富含的浊沸石还起到抗压保孔作用。因此准噶尔盆地东部凹陷区二叠系上乌尔禾组储层共发育超深层裂缝和富含浊沸石的溶蚀孔2种模式,为深层—超深层储层油气富集创造良好条件。

关键词：准噶尔盆地二叠系上乌尔禾组深层—超深层储层浊沸石地层超压发育模式

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邻接已建地下室深大基坑支护结构设计实践

工程勘察 2024年第2期52卷 14-20,30页

作者：李书波黄莹章新南京市测绘勘察研究院股份有限公司南京210019

随着城市地下空间开发利用的迅猛发展,临近甚至邻接已建地下结构的项目也越来越多,如何利用已有地下结构或其支护结构成为面临的新课题。本文以某综合体项目基坑支护设计为例,阐述了项目特点及支护结构选型,并根据项目特点,针对与已建... 详细信息

随着城市地下空间开发利用的迅猛发展,临近甚至邻接已建地下结构的项目也越来越多,如何利用已有地下结构或其支护结构成为面临的新课题。本文以某综合体项目基坑支护设计为例,阐述了项目特点及支护结构选型,并根据项目特点,针对与已建地下室及原围护结构间传力转换体系、支锚刚度引起的变形协调和地下水处理等关键问题提出了处理措施。工程实践表明,利用已有地下结构作为支撑点是可行的,但需要考虑支撑计算长度引起的支锚刚度变化,其可通过调整支撑杆件布置、加强截面参数及覆板边桁架等措施实现。

关键词：邻接已建地下室深大基坑传力转换体系支锚刚度地下水处理

Mg-6Gd-1Er-6Zn-0.5Zr合金轧板显微组织、力学性能与导热性能

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中国有色金属学报 2024年第5期34卷 1541-1554页

作者：侯健捷李旭东朱训明王云峰娄峰丁宁杜宪李淑波杜文博北京工业大学材料科学与工程学院北京100124 威海万丰镁业科技有限公司威海264209

结构−功能一体化镁合金在国防军工、交通运输、电子通信等领域具有广阔的应用前景,开发力学性能和导热性能协同提升的镁合金板材是实现结构功能一体化镁合金应用的关键。本文以固溶态Mg-6Gd-1Er-6Zn-0.5Zr(质量分数,%,简称GEZ616K)合金... 详细信息

结构−功能一体化镁合金在国防军工、交通运输、电子通信等领域具有广阔的应用前景,开发力学性能和导热性能协同提升的镁合金板材是实现结构功能一体化镁合金应用的关键。本文以固溶态Mg-6Gd-1Er-6Zn-0.5Zr(质量分数,%,简称GEZ616K)合金为研究对象,研究了轧制温度和变形量对轧制态GEZ616K合金微观组织及力学性能和导热性能的影响规律。结果表明:随着轧制变形温度的上升,变形量80%的板材组织经历了从低温混晶→均匀细小再结晶→高温粗大晶粒的变化过程,并伴随基面织构减弱、大角度晶界比例增加以及合金中位错密度降低;当轧制温度一定时,随着变形量的增加,合金中孪晶数量降低,再结晶比例增加,合金力学性能和导热性能同步提升。当轧制温度为425℃时,经80%轧制变形的GEZ616K合金展现出优良的力学性能和导热性能,其抗拉强度、屈服强度和伸长率分别为280 MPa、227 MPa和11.4%,热扩散系数为72.9 mm^(2)/s,热导率为135.3 W/(m·K)。

关键词：镁−稀土合金轧制显微组织导热性能力学性能

A review on thermal conductivity of magnesium and its alloys

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Journal of Magnesium and Alloys 2020年第1期8卷 78-90页

作者： shubo li Xinyu Yang Jiangtao Hou Wenbo Du College of Materials Science and Engineering Beijing University of TechnologyBeijing 100124P.R.China

This review summarizes recent researching works the thermal conductivity of Mg–Zn,Mg–Al,Mg–Mn and Mg–RE *** atoms,heat treatment,deformation and temperature,which have significant influence on the thermal conductivity of magnesium alloys,are *** an individual solute atom,its effects on thermal conductivity are highly dependent on its chemical valence,radius and extra-nuclear *** thermal conductivity of Mg alloys is decreased by solution treatment,but improved by aging and/or annealing *** for the deformed Mg alloys,the thermal conductivity along transverse or normal direction is superior to that of along extrusion or rolling *** expect this review is helpful for those who are working on developing Mg alloys with superior thermal conductivity.©2020 Published by Elsevier *** behalf of Chongqing University.

关键词： Magnesium alloys Thermal conductivity Microstructure Influencing factors

Icosahedral quasicrystalline phase in an as-cast Mg-Zn-Er alloy

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Rare Metals 2009年第3期28卷 297-301页

作者： li Jianhui DU Wenbo li shubo WANG Zhaohui School of Materials Science and Engineering Beijing University of Technology Beijing 100124 China

The microstructure of an as-cast Mg-Zn-Er alloy was investigated through scanning electron microscopy （SEM） and transmission electron microscopy （TEM） equipped with energy dispersive spectroscopy （EDS）. The results indicate that two different second phases, one with eutectoid-lamellar morphology and the other with granular shape, distribute in the α-Mg matrix. The coexistence of the face-centered icosahedral quasicrystalline phase （I-phase） and W-phase with the face-centered cubic structure is found in the as-cast alloy. The coexistence of I-phase and W-phase in the Mg-Zn-Er alloy is because the W-phase is the primary phase and the I-phase forms by peritectic reaction during solidification.

关键词： magnesium alloy microstructure quasicrystal erbium

Improving the Mechanical Properties of Mg–Gd–Y–Ag–Zr Alloy via Pre‑Strain and Two‑Stage Ageing

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Acta Metallurgica Sinica(English Letters) 2023年第3期36卷 456-468页

作者： Baotian Du Zijian Yu Kang Shi Ke liu shubo li Wenbo Du Faculty of Materials and Manufacturing Beijing University of Technology100 PingleyuanChaoyang DistrictBeijing 100124People’s Republic of China

In this study,we investigated the effects of single-stage ageing(SSA),two-stage ageing(TSA),2%pre-strain+single-stage ageing(P2%SSA)and 2%pre-strain-I-two-stage ageing(P2%TSA)on the mechanical properties of as-extruded Mg-8Gd-3Y-0.5Ag-0.5Zr alloy(E alloy).Compared with the SSA treatment,the TSA treatment increased the number density of/β'*** P2%SSA and P2%TSA treatments generated theγ'phase and chain-like precipitates in addition to the/β'*** contributions of these ageing treatments to the alloy strengthening can be ranked as P2%TSA>P2%SSA>TSA>SSA,because the increments in the tensile yield strength were estimated to be 199 MPa>148 MPa>144 MPa>110 ***ferent from the traditional strengthening of/β'phase in the E+SSA and E+TSA alloys,the composite precipitates comprising the/β'phase,γ'phase and chain-like precipitates in the E+P2%SSA and E+P2%TSA alloys provided better combined strengthening ***/β'phase was still dominated in the strengthening effect of the composite *** to the higher number density of/β'phase in the composite precipitates,the E+P2%TSA alloy exhibited the better mechanical performance as compared with the E+P2%SSA ***,the E+P2%TSA alloy had the ultimate tensile strength of 452 MPa,the tensile yield strength of 401 MPa and elongation to failure of 3.3%.

关键词： Magnesium alloys Rare earth Age hardening Pre-strain Mechanical properties