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stress rupture properties and deformation mechanisms of K4750 alloy at the range of 650℃ to 800℃

Journal of Materials Science & Technology 2019年第7期35卷 1270-1277页

作者： Meiqiong Ou Yingche Ma Weiwei Xing Xianchao Hao Bo Chen Leilei Ding Kui Liu Institute of Metal Research Chinese Academy of Sciences

The stress rupture properties and deform ation mechanism s of K4750 alloy at 650 ℃, 700 ℃, 750 ℃ and 800 ℃ were investigated. As the decrease of tem perature and stress, the stress rupture life gradually increased. A Larson-Miller Parameter (LMP) method was used for analyzing the stress rupture life under different conditions. The linear fitting formula between stress (σ) and LMP was derived as σ= 3166.455-119.969 ×LMP and the fitting coefficient w as 0.98. After testing, the dislocation configurations of all stress rupture samples w ere investigated by transm ission electron microscopy (TEM). The tem perature and stress had a significant impact on the deform ation m echanism, thereby affected the stress rupture life of K4750 alloy. As the increasing stress at a given tem perature, the deform ation m echanism gradually transform ed from Orowan looping to stacking fault shearing. Based on experim ental results, the threshold stress at 650 ℃, 700 ℃, 750 ℃ and 800 ℃ for the transition of deformation mechanism was estimated to be about 650 MPa, 530 MPa, 430 MPa and 350 MPa, respectively. Below the threshold stress,γ phase effectively hindered dislocation motion by Orowan looping mechanism, K4750 alloy had along stress rupture life. Slightly above the threshold stress, Orowan looping combining stacking fault shearing was the dom inant mechanism ,the stress rupture life decreased. As the further increase of stress, stacking fault shearing acted as the dominant deformation mechanism , the resistance to dislocation motion decreased rapidly, so the stress rupture life reduced significantly.

关键词： Nickel based superalloy stress rupture properties Dislocation Deformation mechanisms Transmission electron microscopy

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In Silico search and biological validation of MicroR171 family related to abiotic stress response in mulberry(Morus alba)

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Horticultural Plant Journal 2022年第2期8卷 184-194页

作者： Zhichao Sun R.M.Saravana Kumar Jisheng Li Guiming Yang Yan Xie Hebei Universities R&D Center for Sericulture and Specialty Enabling Technologies Chengde 067000China Sericultural Research Insitute Chengde Medical UniversityChengde 067000China

miR171 belongs to a highly conserved and ubiquitously expressed micro RNA gene family across species that play a critical role in controlling plant growth and development through the regulation of the miR171-SCL(scarecrow-like proteins)module.There is limited research available on the evolutionary relationship and functional diversification of miR171 members.In this study,we identified eight miR171 genes in the mulberry genome by bioinformatics analysis that were subsequently used to compare the evolutionary levels and explore abiotic stress mechanisms mediated by mno-miR171s(Morus notabilis miR171s).The results of phylogenetic analysis showed that the mature mno-miR171 sequences have strong sequence conservation,but their critical sites also exhibit high variation leading to functional diversification.Through quantitative real-time PCR,the expression profile of each mno-miR171 was analyzed under different stress treatments.All mno-miR171s,apart from mnomiR171h,were found to be significantly up-regulated under salt and drought stress conditions.The target genes of mno-miR171a namely,Morus020885 and Morus011800,were predicted and verified using the plural RNA method.5-rapid amplification of complementary DNA ends assays further to reveal that the target genes could be degraded by mno-miR171a post-transcriptionally.Overexpression of mno-miR171a in Arabidopsis improved the percentage of seed germination when the seeds were grown in NaCl-and mannitol-containing media.Transgenic plants were observed to grow better under drought conditions.The expression of various stress genes was significantly higher in transgenic plants than in wild type,except ERF11.Taken together,our study confirmed that mno-miR171a enhanced plant resistance to adverse stress environments via the regulation of the SCL targets.

关键词： Mulberry miR171 qRT-PCR SCL Arabidopsis stress

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Genome-wide characterization of MATE family members in Cucumis melo L.and their expression profiles in response to abiotic and biotic stress

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Horticultural Plant Journal 2022年第4期8卷 474-488页

作者： Shuoshuo Wang Kun Chen Jiayu Zhang Jianquan Wang Haosen Li Xiaoyu Yang Qinghua Shi College of Horticulture Science and Engineering Shandong Agricultural UniversityTai’anShandong 271018China State Key Laboratory of Crop Biology Shandong Agricultural UniversityTai’anShandong 271018China Institute of Vegetables Shangqiu Academy of Agriculture and Forestry SciencesShangqiuHenan 476002China

The multidrug and toxic compound extrusion(MATE) family plays pivotal roles in the detoxification process in plants, while no information has been provided for this gene family in melon(Cucumis melo L.) thus far, limiting our understanding of its functions in melon acclimation to stressful environments. In this study, a total of 39 MATEs(CmMATE1–CmMATE39) were observed in the melon genome;these were unevenly distributed in all chromosomes, with the most on Chromosome 1. Based on their orthologous relationship with those from Arabidopsis, rice, and sorghum, melon MATEs were clustered into three subfamilies of Clades Ⅰ, Ⅱ, and Ⅲ, wherein 23, 9, and 7 members were included, respectively.Variable exon number was observed in CmMATEs, and the most were harbored by CmMATE8. Gene ontology(GO) term and cis-regulatory element(CRE) analyses pointed to the potential roles of CmMATEs in both the regulation of melon development and acclimation to various abiotic and biotic stressors. The RNA-seq and qRT-PCR(quantitative real-time PCR) results demonstrated that under normal growth conditions, CmMATEs were expressed in a tissue-and development-specific manner, while their abundance apparently varied in a stress-dependent manner when melon plants were exposed to unfavorable environmental conditions. Altogether, these observations could expand our knowledge about the plant MATE family and benefit functional genomics analysis for CmMATEs in the future.

关键词： Melon MATE Orthologous relationship GO term Expression stress

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Suppression mechanisms on proliferation of glioma U251 cells by FePt nanoparticles through intracellular oxidative stress

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Rare Metals 2022年第4期41卷 1202-1209页

作者： Yao-Min Li Li-Hui Meng Yan-Ru Hu Tian-Tian Zhang Zheng-Nan Su Zhi-Yuan Ouyang Wen-Chao Li Jiang-Ling Wan Qing-Zhi Wu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and Biomedical Materials and Engineering CentreWuhan University of TechnologyWuhan 430070China National Engineering Research Centre for Nanomedicine College of Life Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China

FePt nanoparticles(NPs)have attracted a great deal of attention in biomedical applications due to their excellent superparamagnetic property and anticancer activity,which display promising potential as the MRI/CT contrast imag-ing agent for cancer detection and therapy.In this study,the suppression mechanism induced by FePt NPs on U251 cells is investigated.Glioma U251 cells are co-cultured with FePt NPs at different concentrations,and the intra-cellular oxidative stress was studied by detecting the activities of various redox enzymes and expression of several apoptosis-related proteins.The cell viability assay shows that the highest suppression on the proliferation of glioma U251 cells is 10.5%±5.6%after treatment with 5μg·ml^(-1)FePt NPs for 24 h.In this case,the LDH release remarkably increases.Flow cytometry and fluorescence assay show that FePt NPs promote the apoptosis and G0/G1 phase arrest of U251 cells.

关键词： nanoparticles U251 stress

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Molecular dynamics study on microscale residual stress of graphene/aluminum nanocomposites by selective laser sintering

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Rare Metals 2022年第11期41卷 3677-3683页

作者： Xing-Nan Hao Xia Liu Department of Engineering Mechanics Beijing University of TechnologyBeijing100124China

The fabrication of graphene/metal matrix composites by selective laser sintering(SLS)technique has been extensively studied;however,the complex micros truc ture and residual stress limit their further applications.Her... 详细信息

关键词： stress residual composites

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stress corrosion cracking behaviors of RE-containing ME21 magnesium alloy processed by equal-channel angular pressing

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Journal of Rare Earths 2019年第1期37卷 88-94,M0005页

作者： Jinghua Jiang Qiuyuan Xie Mingshan Qiang Aibin Ma Evans-Kwesi Taylor Yuhua Li Dan Song Jianqing Chen College of Mechanics and Materials Hohai University Suqian Institute Hohai University

A commercial as-cast ME21 magnesium alloy containing rare-earth (RE) element was processed by equalchannel angular pressing to obtain fine-grained micro structure. stress corrosion cracking (SCC) behaviors of the fine-grained samples were studied by slow-strain-rate testing in air, distilled water and Hanks’solution at the strain rate of 1×10^(-6) s^(-1). All samples show a relatively low SCC sensitivity in distilled water but a great SCC tendency in Hanks’ solution. The microscopic observations of the fracture surfaces and the side surfaces reveal obvious active anodic dissolution and hydrogen embrittlement cracks, which indicate the higher SCC susceptibility in Hanks'solution. The fine-grained microstructure with more crystal defects promotes the passivation process of the oxide film and restrains the hydrogen induced cracking of the ME21 magnesium alloy, leading to the higher general corrosion resistance as well as SCC resistance.

关键词： Magnesium alloy stress corrosion cracking Equal-channel angular pressing Corrosion medium Fine-grained Rare earths

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Degradation characteristics of insulation near aluminium foil edges inside dry-type bushing cores under electrothermal compound stress

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High Voltage 2022年第6期7卷 1153-1164页

作者： Ming Chen Xuandong Liu Yuhang Shao Gaoyi Shang Qiaogen Zhang Hao Tang Libao Liu State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi'an Jiaotong UniversityXi'anChina China Electric Power Research Institute BeijingChina Nanjing Electric High Voltage Bushing Co. NanjingChina

Insulation breakdown of dry-type valve-side bushing cores under electrothermal compound stress has become a key factor limiting the safe and stable operation of the converter transformer.Based on slices of the real bushing core,it is observed for the first time that fold,peeling off,and fracture defects exist near the aluminium(Al)foil edge,accompanied by many metal spikes with a curvature radiusstress are investigated accordingly.The results show that high temperature significantly increases the dielectric loss heat energy density and Joule heat energy density,accelerating the insulation degradation near Al foil edges.The parallel crepe paper interface significantly accelerates the growth of electrical trees under AC-superimposed positive DC voltage,while this effect is not significant under AC voltage.As the crepe paper consists of wooden fibres of 10μm diameter,the electrical trees tend to grow along interfaces between fibres and epoxy resin to form“feathery”electrical trees in epoxy resinimpregnated paper samples.

关键词： stress insulation compound

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stress dependence of the creep behaviors and mechanisms of a third-generation Ni-based single crystal superalloy

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Journal of Materials Science & Technology 2019年第5期35卷 752-763页

作者： Quanzhao Yue Lin Liu Wenchao Yang Chuang He Dejian Sun Taiwen Huang Jun Zhang Hengzhi Fu State Key Laboratory of Solidification Processing Northwestern Polytechnical University

Elevated temperature creep behaviors at 1100℃ over a wide stress regime of 120-174 MPa of a thirdgeneration Ni-based single crystal superalloy were studied. With a reduced stress from 174 to 120 MPa, the creep life increased by a factor of 10.5, from 87 h to 907 h, presenting a strong stress dependence. A splitting phenomenon of the close-(about 100 nm) and sparse-(above 120 nm) spaced dislocation networks became more obvious with increasing stress. Simultaneously, ao superdislocations with low mobil让ies were frequently observed under a lower stress to pass through γ precipitates by a combined slip and climb of two ao superpartials or pure climb. However, ao superdislocations with higher mobility were widely found under a higher stress, which directly sheared into y precipitates. Based on the calculated critical resolved shear stresses for various creep mechanisms, the favorable creep mechanism was systematically analyzed. Furthermore, combined with the microstructural evolutions during different creep stages, the dominant creep mechanism changed from the dislocation climbing to Orowan looping and precipitates shearing under a stress regime of 137-174MPa, while the dislocation dim bing mechanism was operative throughout the whole creep stage un der a stress of 120 MPa, resulting a superior creep performanee.

关键词： Ni-based single crystal superalloy Creep Dislocation network Critical resolved shear stress Creep mechanism

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The Function of GABA in Plant Cell Growth, Development and stress Response

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Phyton-International Journal of Experimental Botany 2023年第8期92卷 2211-2225页

作者： Yue Jin Lulu Zhi Xin Tang Yilin Chen John T.Hancock Xiangyang Hu Shanghai Key Laboratory of Bio-Energy Crops Research Center for Natural ProductsPlant Science CenterSchool of Life SciencesShanghai UniversityShanghai200444China School of Applied Sciences College of HealthScience and SocietyUniversity of the West of EnglandBristolUK

Gamma-aminobutyric acid(GABA)is a ubiquitous four-carbon non-protein amino acid that is involved in various physiological processes of plant growth and development,such as root architecture,stem elongation,leaf senescence,pollen tube growth,fruit ripening,and seed germination.GABA is also related to plant stress responses,such as drought,salt,cold,and heat stresses.Regulation of GABA in plant stress responses is complex and involves multiple signaling pathways,including calcium and hormone signaling.This paper systematically reviews the synthesis,metabolic pathways and regulatory role of GABA in plants,which will provide new insights into the understanding of plant growth and stress responses and offer novel strategies for improving crop productivity and stress.

关键词： GABA stress growth and development

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stress Study on CrN Thin Films with Different Thicknesses on Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2018年第3期31卷 329-336页

作者： Di Fan Hao Lei Chao-Qian Guo Dong-Li Qi Jun Gong Chao Sun Institute of Metal Research Chinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China School of Science Shenyang Ligong UniversityShenyang 110159China

The reliability of a substrate curvature-based stress measurement method for CrN thin films on substrate with fluctuant surface was discussed.The stress error led by the ignorance of substrate thermal deformation was studied.Results showed that this error could be as large as several hundred MPa under general deposition conditions.stress in the CrN thin films with different thicknesses ranging from 110 to 330 nm on stainless steel was studied by this method,in comparison with conventional results on silicon wafer.The thin films＇ morphology and structure were investigated and related to the film stress.A significant result of the comparison is that stress evolution in the thin films on steel obviously differs from that on silicon wafer,not only because the two substrates have different coefficients of thermal expansion,which provokes thermal stress,but also the considerable discrepancy in the thin films＇ grain coarsening rate and structure that induce different intrinsic stresses.

关键词： stress CrN film Magnetron sputtering Stoney equation Steel substrate

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