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Effect of Friction Coefficient on Deep Drawing of 6A16 Aluminum Alloy for Automobile Body

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Journal of Wuhan University of Technology(Materials Science) 2020年第1期35卷 208-214页

作者：刘钊扬熊柏青 li xiwu YAN lizhen li Zhihui ZHANG Yongan liU Hongwei State Key Laboratory of Nonferrous Metals and Processes GRIMAT Engineering Institute Co.Ltd.Beijing 101407China GRINM Engineering Institute Co. LTD.Beijing 101407China General Research Institute for Nonferrous Metal Beijing 100088China

Based on the ABAQUS/Explicit finite element method,the forming force changing trend of deep drawing test for 6A16 aluminum alloy plate after pre-aging and storage at room temperature for one month was simulated under friction coefficient ranging from 0 to 0.22.The lubricants selected for the tests were mechanical oil,butter and dry film lubricant,and the friction coefficient of these lubricants were 0.05,0.10 and 0.15,respectively.Microstructural evolution of 6 A16 aluminum alloy plate during drawing forming was investigated by OM,SEM and EBSD.The results showed that,with the increase of friction coefficient,the stress,strain and deformation degree in deformation zone increased,while the grain size in deformation zone decreased.Thus,the hardness of the cup-typed component increased with the increase of friction coefficient.Butter-lubricated cups had the highest tensile strength and yield strength after paint-bake cycle.The combination of simulation results and microstructure analysis of 6A16 aluminum alloy plate after drawing forming indicates that the appropriate lubricant is butter.

关键词： finite element method 6A16 aluminum alloys deep drawing test friction coefficient

Small-angle X-ray scattering investigation of aging behavior of Al-Cu-Mg-Ag alloys using synchrotron radiation

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Rare Metals 2012年第6期31卷 537-540页

作者： Zhang Jianbo Zhang Yongan Zhu Baohong liu Ruiqing li Zhihui li xiwu Gen Res Inst Nonferrous Met State Key Lab Nonferrous Met & Proc Beijing 100088 Peoples R China Jiangxi Univ Sci & Technol Engn Res Inst Ganzhou 341000 Peoples R China

The aging behavior of Al-Cu-Mg-Ag alloys with high Cu/Mg was studied by transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS) using synchrotron radiation. TEM study reveals that the major strengthening phases of the alloy after aging at 160 °C for 10 h are Ω and less θ′. SAXS study shows that the scattering patterns are composed of several concentric circles at the beginning of aging process, which is replaced by the butterfly-wings scattering patterns with the increase of aging time. The butterfly-wings scattering patterns are composed of several branches. The angles between the branches are roughly equal to that between the habit planes of precipitates. The evolution of Guinier radius with aging time indicates the good coarsening resistance of the precipitates. The evolution of integrated intensity is consistent with the classical two-step precipitation process.

关键词： Al-Cu-Mg-Ag alloys precipitate size synchrotron radiation small angle X-ray scattering

Effect of one-step aging on microstructure and properties of a novel Al-Zn-Mg-Cu-Zr alloy

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Science China(Technological Sciences) 2009年第1期52卷 67-71页

作者： li xiwu XIONG BaiQing ZHANG YongAn HUA Cheng WANG Feng ZHU BaoHong liU HongWei State Key Laboratory for Fabrication and Processing of Non-ferrous Metals General Research Institute for Non-ferrous MetalsBeijing 100088China

The effect of one-step aging temper on the mechanical properties, electrical conductivity and the microstructure of a novel Al-7.5Zn-1.6Mg-1.4Cu-0.12Zr alloy has been investigated. The results indicated that with elevating the aging temperature from 100℃ to 160℃, the aging response rate was greatly accelerated, and the UTS at peak aging condition decreased, while the corresponding TYS increased. However, the electrical conductivity of the alloy became higher. After aging for 24 h at 120℃, the peak UTS and TYS values were achieved as 591 MPa and 541 MPa, respectively; but the alloy achieved a lower conductivity, 20.4 MS/m. When T6 temper was performed at 140℃ for 14 h, the UTS decreased only by 1% of the former, whereas the TYS and the electrical conductivity increased obviously, which were up to 559 MPa and 22.6 MS/m, respectively. The major strengthening precipitates of the peak-aged alloy were GP zones and η′ phase. The precipitates in both the matrix and the grain boundary became coarser with rising aging temperature. There were obvious PFZs along the grain boundary both in T6 conditions aged at 140℃ and 160℃.

关键词： Al-Zn-Mg-Cu alloy one-step aging properties microstructure

深水斜坡沉积特征与控制因素——以澳大利亚柔布克盆地为例

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海洋地质前沿 2024年第7期40卷 45-55页

作者：姜露珊栾锡武李作福肖菲金龙薛洋山东科技大学地球科学与工程学院青岛266590 中国地质调查局青岛海洋地质研究所青岛266237

深水斜坡沉积规律对深水油气勘探开发以及深水地质灾害防护具有重要的研究意义。为揭示澳大利亚柔布克盆地新近纪深水斜坡沉积特征与控制因素,利用高分辨率二维地震资料,划分了斜坡沉积地层层序,在地震剖面上识别出7个三级层序界面和6... 详细信息

深水斜坡沉积规律对深水油气勘探开发以及深水地质灾害防护具有重要的研究意义。为揭示澳大利亚柔布克盆地新近纪深水斜坡沉积特征与控制因素,利用高分辨率二维地震资料,划分了斜坡沉积地层层序,在地震剖面上识别出7个三级层序界面和6个地震层序。研究结果表明:研究区新近纪主要形成了进积型、加积-进积混合型和退积型沉积层序;柔布克盆地深水区发育前积型碳酸盐岩、硅质碎屑三角洲和滑塌3种斜坡沉积;研究区深水斜坡沉积受多种因素共同控制,中渐新世—晚中新世,斜坡沉积主要受相对海平面升降、古气候变化和物源供给的控制,而晚中新世之后,向北漂移的澳大利亚板块与班达岛弧发生碰撞,深水斜坡沉积主要受构造活动的控制。

关键词：深水斜坡沉积控制因素深水油气反射地震柔布克盆地

Kinetics and capacities of non-reactive phosphorus (NRP) sorption to crushed autoclaved aerated concrete (CAAC)

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Journal of Environmental Sciences 2023年第5期127卷 799-810页

作者： Shuting Shen Xiang li Zhuofan Geng xiwu Lu School Energy and Environment Southeast UniversityNanjing 210096China ERC Taihu Lake Water Environment Wuxi Wuxi 214135China

With growing interest in resource recovery and/or reuse,wastematerials have been considered a promising alternative for phosphorus(P)adsorption because they are low-cost and easily accessible.Crushed autoclaved aerated concrete(CAAC),as representative construction waste,has been extensively studied for P removal in ecological technologies such as treatment wetlands.However,most of the previous studies focused on the adsorption of orthophosphate,namely reactive phosphorus,and lacked attention to non-reactive phosphorus(NRP)which is widely present in sewage.This study presents the first investigation on the potential and mechanism of CAAC removing four model NRP compounds.Adsorption isotherm and kinetics of NRP onto CAAC indicate that the removal of NRP was a chemisorption process and also involved a two-step pore diffusion process.The desorption experiment shows that different NRP species showed varying degrees of desorption.Most NRP was irreversibly adsorbed on CAAC.Among the model compounds considered in this study,the adsorption capacity and hydrolysis rate of organophosphorus were much less than that of inorganic phosphorus.Moreover,the adsorption of different NRP species by CAAC in the mesocosm study was different from the results of laboratory adsorption experiments,and the possible biodegradation was essential for the conversion and removal of NRP.The findings confirmed the validity of CAAC for NRP removal and the potential advantages of CAAC in terms of costs and environmental impact.This study will contribute to a better understanding of NRP conversion and environmental fate and that can be the basis for a refined risk assessment.

关键词： Non-reactive phosphorus Crushed autoclaved aerated concrete Phosphorus removal Sorption Wastewater treatment

蒲公英TmRAV1基因克隆及其响应脱落酸信号表达分析

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植物资源与环境学报 2024年第1期33卷 47-58页

作者：吴志清亓希武房海灵于盱李莉柏杨刘群梁呈元南京中医药大学江苏南京210023 江苏省中国科学院植物研究所(南京中山植物园) 江苏省植物资源研究与利用重点实验室江苏南京210014

根据脱落酸处理的蒲公英(Taraxacum mongolicum Hand.-Mazz.)的转录组数据,在蒲公英中克隆获得1个编码RAV转录因子的基因序列,命名为TmRAV1。TmRAV1的开放阅读框(ORF)长度为1026 bp,编码342个氨基酸。TmRAV1的理论相对分子质量为38229,... 详细信息

根据脱落酸处理的蒲公英(Taraxacum mongolicum Hand.-Mazz.)的转录组数据,在蒲公英中克隆获得1个编码RAV转录因子的基因序列,命名为TmRAV1。TmRAV1的开放阅读框(ORF)长度为1026 bp,编码342个氨基酸。TmRAV1的理论相对分子质量为38229,理论等电点为pI 9.20。TmRAV1为不稳定蛋白,具有亲水性,没有跨膜结构域和信号肽,含有44个磷酸化位点。氨基酸序列比对结果显示:TmRAV1与莴苣(Lactuca sativa linn.)LsRAV1氨基酸序列的同源性最高(一致性为85.88%),具有高度保守的AP2和B3结构域。系统发育分析结果表明TmRAV1与其他5种植物的RAV转录因子聚在一起。TmRAV1在蒲公英叶中的相对表达量显著(P<0.05)高于根和花。TmRAV1受100μmol·L^(-1)脱落酸和250 mmol·L^(-1)NaCl的显著诱导。TmRAV1能够显著上调脱落酸敏感型转录因子基因TmAREB1的表达。TmRAV1是核定位转录因子,与脱落酸信号核心蛋白家族成员TmSnRK2.6互作。综上所述,蒲公英TmRAV1响应脱落酸等多种信号,其编码蛋白与TmSnRK2.6互作,并调控TmAREB1的表达。

关键词：蒲公英 TmRAV1 基因克隆表达脱落酸信号响应

Residual stress with asymmetric spray quenching for thick aluminum alloy plates

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International Journal of Minerals,Metallurgy and Materials 2023年第11期30卷 2200-2211页

作者： Ning Fan Zhihui li Yanan li xiwu li Yongan Zhang Baiqing Xiong State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.Ltd.Beijing 100088China GRIMAT Engineering Institute Co. Ltd.Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China

Solution and quenching heat treatments are generally carried out in a roller hearth furnace for large-scale thick aluminum alloy plates.However,the asymmetric or uneven spray water flow rate is inevitable under industrial production conditions,which leads to an asymmetric residual stress distribution.The spray quenching treatment was conducted on self-designed spray equipment,and the residual stress along the thickness direction was measured by a layer removal method based on deflections.Under the asymmetric spray quenching condition,the subsurface stress of the high-flow rate surface was lower than that of the low-flow rate surface,and the difference between the two subsurface stresses increased with the increase in the difference in water flow rates.The subsurface stress underneath the surface with a water flow rate of 0.60 m^(3)/h was 15.38 MPa less than that of 0.15 m^(3)/h.The simulated residual stress by finite element(FE)method of the high heat transfer coefficient(HTC)surface was less than that of the low HTC surface,which is consistent with the experimental results.The FE model can be used to analyze the strain and stress evolution and predict the quenched stress magnitude and distribution.

关键词： aluminum alloy spray quenching residual stress layer removal method finite element method

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薄荷McZFP1基因克隆及表达分析

植物资源与环境学报 2024年第1期33卷 35-46,58页

作者：郑晓薇柏杨亓希武于盱房海灵李莉刘冬梅梁呈元江苏省中国科学院植物研究所(南京中山植物园) 江苏省植物资源研究与利用重点实验室江苏南京210014

根据前期茉莉酸甲酯处理的薄荷(Mentha canadensis linn.)转录组数据分析结果,从薄荷中克隆到McZFP1,并进行了基因和蛋白质特性、组织表达、非生物胁迫处理下的表达、亚细胞定位以及转录自激活活性分析。结果显示:薄荷McZFP1的开放阅读... 详细信息

根据前期茉莉酸甲酯处理的薄荷(Mentha canadensis linn.)转录组数据分析结果,从薄荷中克隆到McZFP1,并进行了基因和蛋白质特性、组织表达、非生物胁迫处理下的表达、亚细胞定位以及转录自激活活性分析。结果显示:薄荷McZFP1的开放阅读框长度为558 bp,编码185个氨基酸。McZFP1具亲水性,无跨膜结构域,属于不稳定蛋白,包含C2H2保守结构域,含有13个丝氨酸、3个酪氨酸和3个苏氨酸的磷酸化位点。进化树分析结果表明McZFP1与一串红(Salvia splendens Ker-Gawler)SsZFP7的亲缘关系最近。实时荧光定量PCR结果表明:McZFP1在薄荷不定根、茎、根状茎、幼叶、成熟叶和花中均有表达,在根状茎中的相对表达量最高,且受150 mmol·L^(-1)NaCl、300 mmol·L^(-1)甘露醇、200μmol·L^(-1)脱落酸和200μmol·L^(-1)茉莉酸甲酯处理诱导表达。McZFP1定位于细胞核,无转录自激活活性。综上所述,薄荷McZFP1在不同组织中存在表达差异,参与调节激素和非生物胁迫响应过程。

关键词：薄荷锌指蛋白(ZFP)转录因子生物信息学亚细胞定位表达

Resistance and fitness costs in diamondback moths after selection using broflanilide, a novel meta-diamide insecticide

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Insect Science 2022年第1期29卷 188-198页

作者： Xi Sun Rui Wei linhong li Bin Zhu Pei liang xiwu Gao Department of Entomology China Agricultural UniversityBeijing100193China

The diamondback moth (DBM) Plutella xylostella (L.) (Lepidoptera: Plutellidae) is an insect pest found around the world that feeds on cruciferous crops. The DBM has become resistant to most insecticides in current use in the field. Broflanilide is a novel meta-diamide insecticide that binds to a new site on the γ-aminobutyric acid receptor and very efficiently protects against most pests in the order Lepidoptera, including DBM. In this study, the resistance of a laboratory-bred susceptible strain of DBM to broflanilide and the fitness costs posed by broflanilide to the DBM were evaluated. The DBM had no obvious resistance to broflanilide after 10 generations of selection. The realized heritability h2 was 0.033, suggesting a low risk of resistance developing in this strain. The F10 generation had no cross-resistance to the insecticides abamectin and endosulfan (which target the γ-aminobutyric acid receptor) and chlorantraniliprole (which targets a non-γ-aminobutyric acid receptor). The specific activities of important detoxification enzymes (cytochrome P450 monooxygenase, esterase, and glutathione S-transferase) were not obviously altered. However, the larval stage was prolonged and the adult stage was shortened significantly in F11 generation than the F0 generation. The total preoviposition period TPOP significantly prolonged 1.90 d in F11 generation. The fitness value Rf (0.93) was lower for the F11 generation than the F0 generation. The results indicated that long-term exposure to broflanilide exerts clear fitness costs in the DBM. This information will be useful in identifying reasonable broflanilide application guidelines for managing broflanilide resistance in the DBM.

关键词： broflanilide cross-resistance detoxifying enzymes fitness cost Plutella xylostella