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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

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

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

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

Interfacial stress engineering toward enhancement of ferroelectricity in Al doped HfO_(2)thin films

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Chinese Physics B 2024年第9期33卷 637-643页

作者： S x.chen M M chen Y Liu D W Cao G J chen Department of Microelectronics Jiangsu UniversityZhenjiang 212013China Department of Physics Jiangsu UniversityZhenjiang 212013China Guangdong–Hong Kong–Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology Foshan UniversityFoshan 528225China

Ferroelectric HfO_(2)has attracted much attention owing to its superior ferroelectricity at an ultra-thin thickness and good compatibility with Si-based complementary metal-ox.de-semiconductor(CMOS)***,the crystallization of polar orthorhombic phase(o-phase)HfO_(2)is less competitive,which greatly limits the ferroelectricity of the as-obtained ferroelectric HfO_(2)thin ***,the crystallization of o-phase HfO_(2)can be thermodynamically modulated via interfacial stress *** this paper,the growth of improved ferroelectric Al doped HfO_(2)(HfO_(2):Al)thin films on(111)-oriented Si substrate has been *** analysis has suggested that nonpolar monoclinic HfO_(2):Al grown on(111)-oriented Si substrate suffered from a strong compressive strain,which promoted the crystallization of(111)-oriented o-phase HfO_(2)in the as-grown HfO_(2):Al thin *** addition,the in-plane lattice of(111)-oriented Si substrate matches well with that of(111)-oriented o-phase HfO_(2),which further thermally stabilizes the o-phase HfO_(2).Accordingly,an improved ferroelectricity with a remnant polarization(2P_(r))of 26.7C/cm^(2) has been *** results shown in this work provide a simple way toward the preparation of improved ferroelectric HfO_(2)thin films.

关键词： improved ferroelectricity interfacial stress engineering compressive strain HfO_(2)

Serum amylase as a novel prognostic marker of organophosphorus poisoning: a retrospective study

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Emergency and Critical Care Medicine 2024年第3期4卷 111-116页

作者： Guo x. chen Z. Feng K. Zeng S. Zhang J. Ma Z. Yuan C. School of Clinical Medicine Ningxia Medical University Ningxia Hui Yinchuan China Emergency Department General Hospital of Ningxia Medical University Ningxia Hui Autonomous Region Yinchuan China

Background: This study aims to ex.lore the significance of serum amylase levels in patients with organophosphorus pesticide (OP) poisoning and to provide a new perspective for evaluating the severity and prognosis of OP poisoning. Methods: The clinical data of 67 patients with acute OP poisoning, who had been treated in the emergency department of the General Hospital of Ningx.a Medical University between September 2020 and August 2022, were retrospectively analyzed. Using Spearman rank correlation, serum amylase levels during admission and severity of poisoning correlated with discharge outcomes. Based on serum amylase levels, receiver operating characteristic curves were plotted to predict the severity and mortality of patients who ex.erience organophosphate poisoning. The optimal threshold serum amylase level at admission was determined based on the max.mum Youden index. Results: Using Spearman rank correlation analysis, serum amylase levels at admission positively correlated with the severity of poisoning and discharge outcomes, but the degree of correlation was weak (rs: 0.344; 0.264; P x.mum Youden index. the optimal threshold of serum amylase were 97.8 and 194.1 U/L when the degree of poisoning was severe and the discharge outcome of patients was died. In comparison to patients with serum amylase levels ≤194.1 U/L at admission, the OR values of death in patients with serum amylase levels >194.1 U/L at admission was 15.944 (95% CI: 1.825–139.274). Conclusion: Serum amylase levels in patients with organophosphate poisoning correlate with the degree of poisoning and discharge outcomes. Higher serum amylase level was a risk factor for organophosphorus poisoning death. © Wolters Kluwer Health, Inc. All rights reserved.

关键词： Amylase Emergency department Organophosphorus pesticide poisoning Prognosis

Chinese Ex.ert Consensus on the Diagnosis and Treatment of Adult Dermatomyositis (2022)#

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International Journal of Dermatology and Venereology 2024年第3期7卷 163-173页

作者： Cao H. chen A.-J. Cui Y. Deng D.-Q. Gao x.-H. He Y.-L. Kang x.-J. Jin H.-Z. Li C.-x. Li F. Li H.-J. Liao W.-J. Liu x.-M. Lu Q.-J. Lu Y. Pan M. Pan W.-H. Shu x.-M. Sun Q. Tang K.-Y. Tao J. Wang Y. x.ao T. Zhang F.-R. Zhang H.-L. Department of Dermatology Ruijin Hospital Affiliated Shanghai Jiao Tong University School of Medicine Shanghai 200025 China Department of Dermatology First Affiliated Hospital of Chongqing Medical University Chongqing 400042 China Department of Dermatology China-Japan Friendship Hospital Beijing 100029 China Department of Dermatology The Second Affiliated Hospital of Kunming Medical University Yunnan Kunming 650101 China Department of Dermatology The First Hospital of China Medical University Liaoning Shenyang 110001 China Department of Dermatology Beijing Chaoyang Hospital Affiliated to Capital Medical University Beijing 100020 China Department of Dermatology and Venereology People's Hospital of Xinjiang Uygur Autonomous Region Xinjiang Uygur Autonomous Region Urumqi 830001 China Department of Dermatology State Key Laboratory of Complex Severe and Rare Diseases Peking Union Medical College Hospital Chinese Academy of Medical Science Peking Union Medical College Beijing 100730 China Department of Dermatology First Medical Center PLA General Hospital Beijing 100853 China Department of Dermatology Hainan Hospital of PLA General Hospital Hainan Sanya 572013 China Department of Dermatology Xijing Hospital Air Force Medical University Shaanxi Xi'an 710032 China Department of Dermatology Huazhong University of Science and Technology Union Shenzhen Hospital Guangdong Shenzhen 518052 China Hospital for Skin Diseases Institute of Dermatology Chinese Academy of Medical Sciences Peking Union Medical College Jiangsu Nanjing 210042 China Department of Dermatology Jiangsu Province Hospital The First Affiliated Hospital Nanjing Medical University Jiangsu Nanjing 210029 China Department of Dermatology Shanghai Changzheng Hospital Second Affiliated Hospital of Naval Medical University Shanghai 200003 China Department of Rheumatology China-Japan Friendship Hospital Beijing 100029 China Department of Dermatology Qilu Hospital of Shandong Universit

Dermatomyositis, an idiopathic inflammatory myopathy, is characterized by distinctive skin manifestations, prox.mal muscle weakness, and multiple organ involvement and can be accompanied by malignancies. To provide a reference for dermatologists and clinicians in other relevant fields of clinical practice, ex.erts from the Dermatology Branch of the China International Ex.hange and Promotion Association for Medical and Health Care and the National Clinical Research Center for Dermatologic and Immunologic Diseases developed this consensus on the diagnosis and treatment of adult dermatomyositis using Chinese and international literature and ex.ert advice. © 2024 Wolters Kluwer Health. All rights reserved.

关键词： adult clinical protocols dermatomyositis diagnosis ex.ert consensus treatment

TcPO2 changes are more pronounced than SpO2 changes during simulated altitude changes in a hypobaric ox.gen chamber: a nonrandomized controlled trial

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Emergency and Critical Care Medicine 2024年第3期4卷 105-110页

作者： Li Y. chen L. Fu Z. Wang Z. Sun S. Luan x. Ma D. Hu T. School of Nursing and Rehabilitation Shandong University Shandong Jinan China Department of Emergency and Critical Care Medicine Qilu Hospital of Shandong University Shandong Jinan China Department of Pulmonary and Critical Care Medicine Qilu Hospital of Shandong University Shandong Jinan China Emergency Management Center of State Grid Shandong Electric Power Company Shandong Jinan China School of Nursing and Rehabilitation Cheeloo College of Medicine University of Shandong Department of Infection Control Qilu Hospital of Shandong University Shandong Jinan China School of Mechanical Engineering Shandong University Key Laboratory of the Ministry of Education for Efficient and Clean Machinery Manufacturing National Experimental Teaching Demonstration Center for Mechanical Engineering Shandong Jinan China

Background: Hypox.a is a significant risk factor of hypertension. However, no studies have used transcutaneous tissue partial pressure of ox.gen (TcPO2) and partial pressure of carbon diox.de (TcPCO2) monitors to measure the respective partial pressures in healthy individuals. Ox.gen saturation (SpO2) is often used for traditional monitoring of vital signs. This study investigated the changes in TcPO2 and SpO2 values during rapid changes in altitude. The trial was registered at *** (registration no. NCT06076057). Methods: Healthy adult volunteers were instructed to sit vertically in a hypobaric ox.gen chamber, which ascended from 0 m to 2500 m at a uniform speed within 10 min. The Danish Radiometer TCM4 was used to measure TcPO2 and TcPCO2 with the ventral side of the upper arm as the measurement site. The Shenzhen Kerokan P0D-1 W pulse ox.meter was used to measure heart rate and SpO2, with values recorded once every 500 m. Results: Altogether, 49 healthy volunteers were recruited between March 2023 and August 2023. With increasing altitude, TcPO2 and SpO2 decreased significantly (P 500 m, statistical significance was identified between TcPO2 in both sex.s (P x.c environments, TcPO2 changed more dramatically than SpO2 © Wolters Kluwer Health, Inc. All rights reserved.

关键词： Altitude change Low-pressure ox.gen chamber Transcutaneous ox.gen saturation Transcutaneous partial pressure of ox.gen

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Profile of *** chen

Science China(Life Sciences) 2024年第10期67卷 2062-2063页

作者： chen, Songlin Yellow Sea Fisheries Res Inst Qingdao Peoples R China

For decades,*** has been engaged in fish germplasm preservation,sex.control and research focusing on molecular breeding for disease *** discovered the first sex.specific molecular marker of fish(chen et al.,2007),deciphered the first fish genome(Chinese tongue sole)in China,revealed the sex.determination mechanism in fish(chen et al.,2014),and created molecular sex.control *** also discovered the molecular mechanism of metamorphosis in flatfish(Shao et al.,2017)and developed China's first fish disease-resistant breeding gene chip,“YUx.N No.1”.

关键词： technology breeding