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Improvement of elevated-temperature strength and recrystallization resistance via Mn-containing dispersoid strengthening in Al-Mg-Si 6082 alloys

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Journal of Materials Science & Technology 2020年第4期39卷 135-143页

作者： chen Li Kun Liu x.-grant chen Department of Applied Science University of Québec at ChicoutimiChicoutimiQC G7H 2B1Canada

The precipitation behavior of Mn-containing dispersoids in Al-Mg-Si 6082 alloys with different Mn contents(0,0.5 and 1.0 wt%)during various heat treatments(300–500℃)was *** effects of dispersoids on elevated-temperature strength and recrystallization resistance during hot-rolling and post-rolling annealing were *** results showed that the dispersoids in the Mn-containing alloys(0.5 and 1.0%)began to precipitate at 350℃and reached the optimum conditions after 2–4 h at 400℃.However,the dispersoids coarsened with increasing holding time at temperatures above450℃.After the peak precipitation treatment at 400℃for 2 h,the yield strength at 300℃increased from 28 MPa(base alloy free of Mn)to 55 MPa(alloy with 0.5%Mn)and 70 MPa(alloy with 1%Mn),respectively,demonstrating a significant dispersoid strengthening effect at elevated *** addition,the dispersoids were thermally stable at 300℃for up to 1000 h holding owing to its relative high precipitation temperature(350–400℃),leading to the superior constant mechanical performance at elevated temperature during the long service *** hot rolling and post-rolling annealing,the presence of a large amount of dispersoids results in the higher Zener drag PZcompared with base alloy and then significantly improved the recrystallization *** alloy containing 0.5%Mn ex.ibited the highest recrystallization resistance among three ex.erimental alloys studied during the post-rolling process,likely resulted from the lower coarsening rate of dispersoids and the lower dispersoids free zone.

关键词： Al-Mg-Si 6082 alloy Mn addition Dispersoid precipitation Elevated-temperature strength Recrystallization resistance

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Effects of Mn content on recrystallization resistance of AA6082 aluminum alloys during post-deformation annealing

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Journal of Materials Science & Technology 2020年第17期52卷 189-197页

作者： x.aoming Qian Nick Parson x.-grant chen Department of Applied Science University of Quebec at ChicoutimiSaguenay G7H 2B1Canada Arvida Research and Development Centre Rio Tinto AluminumSaguenay G7S 4K8Canada

The microstructural evolutions under as-homogenized and as-deformed conditions and after the postdeformation annealing of AA6082 aluminum alloys with different Mn content(0.05 wt.%-1 wt.%)were studied by optical,scanning electron,and transmission electron *** results showed that the presence of a large amount ofα-Al(Mn,Fe)Si dispersoids induced by Mn addition significantly improved the recrystallization *** the base alloy free of Mn,static recrystallization occurred after 2 h of annealing,and grain growth commenced after 4 h of annealing,whereas in Mn-containing alloys,the recovered grain structure was well-retained after even 8 h of *** alloy with 0.5%Mn ex.ibited the best recrystallization resistance,and a further increase of the Mn levels to 1%resulted in a gradual reduction of the recrystallization resistance,the reason for which was that recrystallization occurred only in the dispersoid-free zones(DFZs)and the increased DFZ fraction with Mn content led to an increase in the recrystallization *** variation in the dispersoid number density and a coarsening of dispersoids during annealing have a limited influence on the static recrystallization in Mn-containing alloys.

关键词： AA6082 alloys Mn effects Recrystallization resistance Dispersoid precipitation Post-deformation annealing

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均匀化前预处理对7150铝合金中Al_3Zr相析出及再结晶的影响

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轻合金加工技术 2016年第2期44卷 21-27页

作者：郭占英丛福官赵刚 x.-grant chen 田妮东北大学材料各向异性与织构教育部重点实验室辽宁沈阳110819 魁北克大学希库蒂米分校应用科学学院东北轻合金有限责任公司黑龙江哈尔滨150060

用透射电子显微镜（TEM）及电子背散射（EBSD）技术,研究了均匀化前进行250℃~400℃预处理对7150铝合金中Al3Zr相析出行为及变形后固溶处理过程再结晶抗力的影响。结果表明,7150铝合金是否进行均匀化前预处理,其经470℃24 h的均匀化后... 详细信息

用透射电子显微镜（TEM）及电子背散射（EBSD）技术,研究了均匀化前进行250℃~400℃预处理对7150铝合金中Al3Zr相析出行为及变形后固溶处理过程再结晶抗力的影响。结果表明,7150铝合金是否进行均匀化前预处理,其经470℃24 h的均匀化后其合金中Al3Zr析出相与Al基体均为共格关系。随均匀化前预处理温度降低,Al3Zr析出相的尺寸变小、密度提高;在250℃预处理,随预处理时间延长,最终Al3Zr析出相的尺寸变小、密度提高;当预处理温度超过300℃时,随预处理时间延长,Al3Zr析出相的尺寸变大、密度降低,但预处理时间超过24 h后其影响不明显。7150铝合金铸锭经470℃均匀化前预处理能显著提高其变形后再结晶抗力,经470℃2h固溶处理后,其组织为未再结晶的回复组织;而直接经470℃均匀化处理后的变形样品经470℃2h固溶处理后,其组织为部分再结晶组织。

关键词： 7150铝合金均匀化 Al3Zr弥散相高分辨TEM 再结晶

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均匀化前预处理对Al-Zn-Mg-Cu合金中含V相析出及再结晶的影响

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轻合金加工技术 2016年第3期44卷 24-30,42页

用透射电子显微镜（TEM）及扫描电镜电子背散射（EBSD）技术,研究了均匀化前250℃~400℃的预处理对w（V）=0.11%的超高强Al-Zn-Mg-Cu合金中Al21V2弥散相析出行为及变形后再结晶抗力的影响,并计算了V在铝基体中的扩散常数和扩散距离。结... 详细信息

用透射电子显微镜（TEM）及扫描电镜电子背散射（EBSD）技术,研究了均匀化前250℃~400℃的预处理对w（V）=0.11%的超高强Al-Zn-Mg-Cu合金中Al21V2弥散相析出行为及变形后再结晶抗力的影响,并计算了V在铝基体中的扩散常数和扩散距离。结果表明,铸锭均匀化处理过程形成Al21V2弥散相,并在晶界附近形成明显的无析出区,其宽度基本不受均匀化处理前预处理的影响;在普通均匀化处理前预处理能明显提高Al21V2弥散相的密度、减小其尺寸;在铝基体中,V在300℃及400℃的扩散常数分别为9.81×10-31m2/s、5.32×10-24m2/s。在300℃预处理合金能获得尺寸最小、密度最高的Al21V2弥散相,而且其热变形后再结晶抗力最大。

关键词：超高强Al-Zn-Mg-Cu合金均匀化 Al21V2相弥散相再结晶

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轻质铝基熵合金:概述与未来趋势

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Science China Materials 2024年第1期67卷 31-46页

作者：崔立莹张展陈晓光 Department of Applied Science University of Quebec at Chicoutimi555boulevard de l’UniversiteSaguenay G7H 2B1QCCanada

新一代合金——高熵合金的出现,揭示了熵效应在合金设计中的重要意义.受这一概念的启发,轻质铝基熵合金这一概念被提出.随着对低密度结构材料的需求不断增加,这些新型合金在各种应用中具有巨大的潜力.本文综述了轻质铝基熵合金的发展背... 详细信息

新一代合金——高熵合金的出现,揭示了熵效应在合金设计中的重要意义.受这一概念的启发,轻质铝基熵合金这一概念被提出.随着对低密度结构材料的需求不断增加,这些新型合金在各种应用中具有巨大的潜力.本文综述了轻质铝基熵合金的发展背景、设计原理、制造方法、微观结构和力学性能、高温应用,及其发展前景.通过对当前研究的全面调查,本文重点研究分析了122种密度低于4.0 g cm-3的铝基熵合金.轻质铝基熵合金可以弥补传统铝和钛合金在机械性能和密度方面的差距.轻质铝基熵合金优异的热稳定性使其有望成为在高温下使用的结构材料.此外,本文还讨论了轻质铝基熵合金领域的未来发展趋势.机器学习作为有效计算工具,可以极大地提高合金的开发效率.

关键词：高温应用合金设计新型合金机器学习铝基计算工具高熵合金微观结构

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Fabrication of Superhydrophobic Surfaces on Aluminum Alloy Via Electrodeposition of Copper Followed by Electrochemical Modification

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Nano-Micro Letters 2011年第3期3卷 160-165页

作者： Ying Huang D.K.Sarkar x.grant chen University Research Center on Aluminum (CURAL) University of Qubec at Chicoutimi

Superhydrophobic aluminum surfaces have been prepared by means of electrodeposition of copper on aluminum surfaces, followed by electrochemical modification using stearic acid organic molecules. Scanning electron microscopy(SEM) images show that the electrodeposited copper films follow "island growth mode" in the form of microdots and their number densities increase with the rise of the negative deposition potentials. At an electrodeposition potential of-0.2 V the number density of the copper microdots are found to be 4.5×104cm^(-2)that are increased to 2.9×105cm^(-2)at a potential of-0.8 V. Systematically, the distances between the microdots are found to be reduced from 26.6 μm to 11.03 μm with the increase of negative electrochemical potential from-0.2 V to-0.8 V. x.ray diffraction(x.D) analyses have confirmed the formation of copper stearate on the stearic acid modified copper films. The roughness of the stearic acid modified electrodeposited copper films is found to increase with the increase in the density of the copper microdots. A critical copper deposition potential of-0.6 V in conjunction with the stearic acid modification provides a surface roughness of 6.2 μm with a water contact angle of 157?, resulting in superhydrophobic properties on the aluminum substrates.

关键词： Superhydrophobic aluminum surface Water contact angle Copper microdots Surface roughness Electrochemical modification

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Cell polarization in ischemic stroke: molecular mechanisms and advances

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Neural Regeneration Research 2025年第3期20卷 632-645页

作者： Yuanwei Li x.aox.ao x. x.an Wu Jiarui Li Shiling chen Danyang chen Gaigai Li Zhouping Tang Department of Neurology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina

Ischemic stroke is a cerebrovascular disease associated with high mortality and disability rates. Since the inflammation and immune response play a central role in driving ischemic damage, it becomes essential to modulate ex.essive inflammatory reactions to promote cell survival and facilitate tissue repair around the injury site. Various cell types are involved in the inflammatory response, including microglia, astrocytes, and neutrophils, each ex.ibiting distinct phenotypic profiles upon stimulation. They display either proinflammatory or anti-inflammatory states, a phenomenon known as ‘cell polarization.’ There are two cell polarization therapy strategies. The first involves inducing cells into a neuroprotective phenotype in vitro, then reintroducing them autologously. The second approach utilizes small molecular substances to directly affect cells in vivo. In this review, we elucidate the polarization dynamics of the three reactive cell populations(microglia, astrocytes, and neutrophils) in the contex. of ischemic stroke, and provide a comprehensive summary of the molecular mechanisms involved in their phenotypic switching. By unraveling the complex.ty of cell polarization, we hope to offer insights for future research on neuroinflammation and novel therapeutic strategies for ischemic stroke.

关键词： astrocyte polarization immune regulation inflammation ischemic injury microglia polarization neutrophil polarization signaling pathways stroke

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Effect of Si,Cu and Fe on mechanical properties of cast semi-solid 206 alloys

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Transactions of Nonferrous Metals Society of China 2010年第9期20卷 1555-1560页

作者： A.LEMIEUx.J.LANGLAIS D.BOUCHARD x.grant chen Rio Tinto Alcan Arvida Research and Development Centre Rio Tinto Alcan Laterrière Works NRC-Aluminium Technology Centre Université du Québec à Chicoutimi

The development of a modified 206 alloy whose composition was optimized to minimize hot tearing during semi-solid forming was reported. The effect of varying silicon, copper and iron contents was investigated using a design of ex.eriment (DOE) approach. Semi-solid slurries were prepared using the SEED process and injected into a high pressure die casting press. The hot tearing sensitivity results were reported for different alloy variants. The microstructure evolution during the semi-solid preparation was presented along with actual die cast components. The effects of silicon, copper and iron on mechanical properties in the T7 condition were also analyzed. Beyond the benefit of reducing hot tearing, it is shown that the tensile and fatigue properties remain compatible with the automotive industry requirements.

关键词： semi-solid forming 206 aluminum alloy SEED process hot tearing mechanical properties

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Effects of diurnal adjustment on biases and trends derived from inter-sensor calibrated AMSU-A data

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Frontiers of Earth Science 2018年第1期12卷 1-16页

作者： H. chen x. ZOU Z. QIN Department of Atmospheric and Oceanic Sciences University of Colorado Boulder Colorado CO 80309 USA Earth System Science Interdisciplinary Center (ESSIC) University of Maryland College Park Maryland MD 20742 USA Joint Center for Data Assimilation Research and Applications Nanjing University of Information Science and Technology Nanjing 210044 China

Measurements of brightness temperatures from Advanced Microwave Sounding Unit-A （AMSU-A） temperature sounding instruments onboard NOAA Polar- orbiting Operational Environmental Satellites （POES） have been ex.ensively used for studying atmospheric temperature trends over the past several decades. Inter- sensor biases, orbital drifts and diurnal variations of atmospheric and surface temperatures must be considered before using a merged long-term time series of AMSU-A measurements from NOAA- 15, - 18, - 19 and MetOp-A. We study the impacts of the orbital drift and orbital differences of local equator crossing times （LECTs） on temperature trends derivable from AMSU-A using near-nadir observa- tions from NOAA-15, NOAA-18, NOAA-19, and MetOp-A during 1998 - 2014 over the Amazon rainforest. The double difference method is firstly applied to estimation of inter-sensor biases between any two satellites during their overlapping time period. The inter-calibrated observations are then used to generate a monthly mean diurnal cycle of brightness temperature for each AMSU-A channel. A diurnal correction is finally applied each channel to obtain AMSU-A data valid at the same local time. Impacts of the inter-sensor bias correction and diurnal correction on the AMSU-A derived long-term atmospheric temperature trends are separately quantified and compared with those derived from original data. It is shown that the orbital drift and differences of LECT among different POESs induce a large uncertainty in AMSU-A derived long-term warming/cooling trends. After applying an inter-sensor bias correction and a diurnal correction, the warming trends at different local times, which are approx.mately the same, are smaller by half than the trends derived without applying these corrections.

关键词： AMSU-A diurnal adjustment decadal tem-perature trend

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Brain region-specific roles of brain-derived neurotrophic factor in social stress-induced depressive-like behavior

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Neural Regeneration Research 2025年第1期20卷 159-173页

作者： Man Han Deyang Zeng Wei Tan x.ngx.ng chen Shuyuan Bai Qiong Wu Yushan chen Zhen Wei Yufei Mei Yan Zeng Brain Science and Advanced Technology Institute Wuhan University of Science and TechnologyWuhanHubei ProvinceChina Geriatric Hospital Affiliated to Wuhan University of Science and Technology WuhanHubei ProvinceChina School of Public Health Wuhan University of Science and TechnologyWuhanHubei ProvinceChina

Brain-derived neurotrophic factor is a key factor in stress adaptation and avoidance of a social stress behavioral *** studies have shown that brain-derived neurotrophic factor ex.ression in stressed mice is brain region–specific,particularly involving the corticolimbic system,including the ventral tegmental area,nucleus accumbens,prefrontal cortex.amygdala,and *** how brain-derived neurotrophic factor participates in stress processing in different brain regions will deepen our understanding of social stress *** this review,we discuss the ex.ression and regulation of brain-derived neurotrophic factor in stress-sensitive brain regions closely related to the pathophysiology of *** focused on associated molecular pathways and neural circuits,with special attention to the brain-derived neurotrophic factor–tropomyosin receptor kinase B signaling pathway and the ventral tegmental area–nucleus accumbens dopamine *** determined that stress-induced alterations in brain-derived neurotrophic factor levels are likely related to the nature,severity,and duration of stress,especially in the above-mentioned brain regions of the corticolimbic ***,BDNF might be a biological indicator regulating stress-related processes in various brain regions.

关键词： amygdala chronic mild stress chronic social defeat stress corticolimbic system depression hippocampus medial prefrontal cortex nucleus accumbens social stress models ventral tegmental area

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