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Toward qualification of additively manufactured metal parts:Tensile and fatigue properties of selective laser melted Inconel 718 evaluated using miniature specimens

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Journal of Materials science & Technology 2022年第2期97卷 239-253页

作者： h.Y.Wan W.K.Yang L.Y.Wang Z.J.Zhou c.P.Li G.F.chen L.M.Lei G.P.Zhang shenyang National Laboratory for Materials science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China school of Materials science and Engineering University of Science and Technology of ChinaShenyang 110016China Materials&Manufacturing Qualification Group Corporate TechnologySiemens Ltd.Beijing 100102China AEcc shanghai commercial Aircraft Engine Manufacturing co. LtdShanghai 201306China

combined with the topology optimization,additive manufacturing can be used to fabricate metal parts with complex ***,due to the geometrical variations and microstructure heterogeneities of the additively manufactured metal parts,new standards with the use of miniature specimens are required for the evalutation of the spatial distribution of mechanical properties throughout the ***,we conduct a systematic investigation on tensile and fatigue properties of selective laser melted Inconel718 specimens with different thicknesses ranging from 0.1 mm to 1 mm.A“microstructure unit”that can well reflect the microstructure characteristic of selective laser melted materials is *** results reveal that premature necking with a dramatic drop in uniform elongation occurs if the ratio(t/d)of specimen thickness(t)to the"microstructure unit"size(d)is less than *** necking is mainly attributed to the transition of strain localization *** also propose a probabilistic statistical model for fatigue limit prediction based on the available fatigue *** is recommended that the criterion of t/d≥4 should be satisfied to ensure that the yield strength,the uniform elongation,and the fatigue limit determined by the miniature specimens are comparable with those determined by standard *** findings may provdie a guide to the establishment of miniature specimen-based standards toward the qualification of additively manufactured metal parts.

关键词： selective laser melting Inconel 718 Miniature specimen Microstructure unit Thickness effect

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Diagnostic techniques for photonic materials based on Raman and Brillouin spectroscopies

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Optoelectronics Letters 2007年第3期3卷 188-191页

作者： M. Mattarelli s.caponi A. chiappini M. Montagna E. Moser F. Rossi c.Tosello c. Armellini A. chiasera M. Ferrari Y. Jestin G. Nunzi conti s. Pelli G.c. Righini Dipartimento di Fisica Università di Trento CSMFO groupTrentoItaly INFM cRs-sOFT c/o Universita' di Roma "La Sapienza"I-00185RomaItaly cNR-IFN Istituto di Fotonica e NanotecnologieCSMFO groupTrentoItaly. Photonic Materials and Devices Laboratory IFAC-CNRSesto FiorentinoItaly. cNR Department of Materials and DevicesRomaItaly.

The elastic and vibrational properties of a material, bulk or planar waveguide, are studied by BriUouin and Raman spectroscopy to follow the process of nanocrystals growth in glass-ceramics. The nanoparticles cause the appearance, in the low frequency Raman spectrum, of characteristic peaks, whose position depends on the size of the crystals. At the same time, sharp crystal peaks, due to optical phonons, appear in the Raman spectra, allowing the determination of the nucleated phase, and a frequency shift of the BriUouin peaks is observed.

关键词：拉曼光谱布里渊光谱光子材料诊断技术

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Effect of temperature on the mechanical abnormity of the quasicrystal reinforced Mg-4%Li-6%Zn-1.2%Y alloy

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Journal of Magnesium and Alloys 2015年第2期3卷 106-111页

作者： c.Q.Li D.K.Xu T.T.Zu E.h.han L.Wang Environmental corrosion center Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China school of Materials and Metallurgy Northeastern UniversityShenyang 110819China

The serrated phenomena of the quasicrystalline phase reinforced Mg-4%Li-6%Zn-1.2%Y alloy after the extrusion,solid solution treatment and aged treatment have been investigated at different *** result shows that when the temperature is above 100℃,the serrated phenomenon becomes weak and all the serrated amplitudes are lower than 1 *** them,the serrated amplitude of samples in aged condition is the lowest and the value is only 0.1-0.2 *** underneath mechanism for the lower plastic instability at higher temperature(≥100℃)can be ascribed to the weak pining effect of solute atoms on the movement of dislocation and release of the pile-up dislocations.

关键词： Mg-Li PLc Quasicrystal high temperature deformation Mechanical property

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Al的能量吸收边缘和电子粒子数布居分析

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物理学报 1999年第1期48卷 140-147页

作者：田淑芬樊锡君于洛平 J.s.BOW R.W.cARPENTER s.h.LIN 山东师范大学现代教育技术研究所山东师范大学物理系

给出了Ａｌ电子能量损失谱吸收边缘的理论解释、电子粒子数布居分析及不同散射分截面计算结果的比较．能量吸收边缘被归一化为每原子每电子伏的散射截面．对散射截面的贡献来自三个方面．第一是来自应用推广的Ｈüｃｋｅｌ带模型得到的... 详细信息

给出了Ａｌ电子能量损失谱吸收边缘的理论解释、电子粒子数布居分析及不同散射分截面计算结果的比较．能量吸收边缘被归一化为每原子每电子伏的散射截面．对散射截面的贡献来自三个方面．第一是来自应用推广的Ｈüｃｋｅｌ带模型得到的电子从内层向价层的跃迁；第二是来自利用电子气模型得到的电离末态；第三是来自激发原子附近的原子产生的外行平面波弹性反向散射．

关键词：吸收边缘电子粒子数铝电子能量谱布居分析

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synthetic neurosteroids on brain protection

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Neural Regeneration Research 2015年第1期10卷 17-21页

作者： Mariana Rey héctor coirini Laboratorio de Neurobiología Instituto de Biología y Medicina Experimental (IBYME-CONICET) Vuelta de Obligado 2490 (C1428ADN) Ciudad Autónoma de Buenos AiresArgentina Departamento de Bioquímica humana Facultad de MedicinaUniversidad de Buenos Aires Paraguay 2155 Ciudad Autónoma de Buenos AiresArgentina

Neurosteroids, like allopregnanolone and pregnanolone, are endogenous regulators of neuronal excitability. Inside the brain, they are highly selective and potent modulators of GABAA receptor activity. Their anticonvulsant, anesthetics and anxiolytic properties are useful for the treatments of several neurological and psychiatric disorders via reducing the risks of side effects obtained with the commercial drugs. The principal disadvantages of endogenous neurosteroids adminis- tration are their rapid metabolism and their low oral bioavailability. synthetic steroids analogues with major stability or endogenous neurosteroids stimulation synthesis might constitute prom- ising novel strategies for the treatment of several disorders. Numerous studies indicate that the 3ct-hydroxyl configuration is the key for binding and activity, but modifications in the steroid nucleus may emphasize different pharmacophores. so far, several synthetic steroids have been developed with successful neurosteroid-like effects. In this work, we summarize the properties of various synthetic steroids probed in trials throughout the analysis of several neurosteroids-like actions.

关键词： allopregnanolone synthetic steroids GABAA receptor neuroprotection cerebral cortex hippocampus

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A study of the comets with Large Perihelion Distances c/2019 L3(ATLAs)and c/2019 O3(Palomar)

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Research in Astronomy and Astrophysics 2024年第9期24卷 199-213页

作者： Alberto s.Betzler centro de ciencia e Tecnologia em Energia e sustentabilidade Universidade Federal do Recôncavo da BahiaFeira de SantanaBahia44.085-132Brazil

This work analyzes the photometric data of the Oort spike comets c/2019 L3(ATLAs)and c/2019 O3(Palomar)obtained between 2016 and 2023 by the ATLAs network and the Belgian Olmen *** comets Palomar and ATLAs have a typical and unusually high activity level,respectively,based on the Afρparameter corrected to phase angle zero at *** absolute magnitude of comets ATLAs and Palomar in the o-band is 4.71±0.05 and 4.16±0.02 *** cometary activity of comets ATLAs and Palomar probably began at r>13 au before perihelion and will end at r>14 au after perihelion,which means that they could remain active until the second half of *** nucleus of comet ATLAs has a minimum radius of 7.9 km,and the nucleus of comet Palomar could be a little *** c-o colors of the comets ATLAs and Palomar are redder and bluer,respectively,at perihelion than the solar twin YBP *** comets showed a bluish trend in the coma color with decreasing heliocentric *** Palomar probably had two outbursts after its perihelion,each releasing about 10^(8)kg of *** slopes of the photometric profile of the comae of these comets were between 1and 1.5,indicating a steady state during the observation campaign.

关键词： individual c/2019 L3(ATLAs) c/2019 O3(Palomar) techniques:photometric methods:data analysis

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Algebra colloquium 2020年第2期27卷 193-198页

作者： s.M.Robati Department of Mathematics Faculty of Science Imam Khomeini International UniversityQazvinIran

Let G be a group,and let →/Γc(G) be a digraph whose vertices are the nontrivial conjugacy classes of G and there is an arc from a vertex c to a vertex c' if and only if c≠c' and(c)■(c').In this paper,we characteri... 详细信息

关键词： conjugacy classes posets graphs finite groups

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A review of conditions altering the permanent appearance of the vulva

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Open Journal of Obstetrics and Gynecology 2012年第4期2卷 382-384页

作者： Ian s. c. Jones Women’s and Newborn services Royal Brisbane and Women’s Hospital Herston Australia

This article is aimed at providing information on variations in the clinical appearance of the vulva. The appearance of the vulva can be altered by reversible or permanent conditions both of which may result in minor or major changes. Reversible conditions include those associated with infections or acute trauma which results in distortion of the vulva. some permanent changes are caused by life threatening conditions which are present at birth whereas others develop more slowly or as the result of a deliberate act either traditional female surgery or surgery performed by a registered medical practitioner. To the inexperienced practitioner changes from the normal vulvar appearance can be confusing. The aim of this article is to highlight and categorise changes that can affect the appearance of the vulva. Whatever the presentation the importance of obtaining a detailed history and performing an appropriate, sensitive and thorough examination can not be over emphasised.

关键词： Vulvar Appearance congenital Traumatic cultural Iatrogenic

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Vitamin B-reath easier:vitamin B6 derivatives reduce IL-33 to limit lung inflammation

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cellular & Molecular Immunology 2023年第12期20卷 1527-1529页

作者： hēth R.Turnquist Thomas E.starzl Transplantation Institute University of Pittsburgh School of MedicineDepartment of Immunologyand Department of SurgeryUniversity of Pittsburgh School of MedicinePittsburghPAUSA McGowan Institute for Regenerative Medicine University of PittsburghPittsburghPAUSA

It has been known for some time that low PLP blood levels are common in asthmatic patients,and supplementation with vitamin B6 may reduce the severity of asthma symptoms[12].In the current study,a comparison of PLP levels in the plasma of asthmatic patients(n=52)and healthy controls(n=58)confirmed lower PLP concentrations in asthmatic patients,which correlated with reduced lung function and increased circulating eosinophils,suggestive of increased type 2 *** several mouse models of acute lung inflammation,they confirmed that systemic or local administration of PLP reduced lung inflammation and eosinophil density,suggesting that PLP concentration may be directly controlling immune responses that lead to the development of allergic airway ***2s constitutively express sT2,and IL-33 profoundly promotes ILc2 expansion and secretion of IL-5 and IL-13 to mediate allergic reactions and support host defenses against parasitic *** reduces the number of type 2 innate lymphoid cells(ILc2s)and their expression of IL-5 and ***,diet-induced vitamin B6 deficiency in mice increased papain-induced lung inflammation,including increasing the proportion of IL5+and IL-13+*** authors revealed that PLP treatment decreased IL-33 levels in the bronchoalveolar lavage fluid(BALF)and lung and targeting IL-33 with an antibody during papain-induced lung inflammation did not reduce inflammation beyond that of PLP treatment *** important clue to the regulation of IL-33 was that PLP treatment did not modify IL-33 mRNA ***,pyridoxal(PL)treatment of a human alveolar basal epithelial cell line(A549)stably expressing full-length IL-33 with a hemagglutinin(hA)tag established that PL exposure potently decreased intracellular IL-33 protein *** researchers used this cell line to explore the underlying mechanisms and verified that PL conversion to PLP by pyridoxal kinase(PDXK)controlled the stability of *** with these data,th

关键词： vitamin inflammation inhibited

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Delayed plasticity during spherical nanoindentation of an iron-chromium-aluminum alloy:Effect of ferric ion irradiation

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Journal of Materials science & Technology 2023年第36期167卷 228-236页

作者： Y.Zhang c.W.Li J.L.Jiang J.F.Gu h.Wang Y.D.Jia G.Wang X.G.An Q.Wang J.Lu Institute of Materials Shanghai UniversityShanghai 200072China school of Materials science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical Engineering City University of Hong KongKowloonSARChina science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610041China Interdisciplinary Materials Research center Institute for Advanced StudyChengdu UniversityChengdu610106China

spherical nanoindentation of an iron-chromium-aluminum alloy was conducted to study the effect of ferric-ion(Fe 3+)irradiation on the time-dependent plasticity behavior in the surface layers of this *** was observed that the initiation of plasticity by the appearance of displacement burst or“pop-in”event occurred after a period of waiting time in the apparent elastic regime and that Fe^(3+)irradiation at 360°c and up to∼0.5 displacements per atom could make it happen under the lower applied loads but with a reduced *** the experimental data,an activation volume and activation energy were extracted for the delayed *** results show that Fe^(3+)-irradiation significantly reduced its acti-vation volume from∼3.05 b 3 to∼1.75 b 3(where b=Burgers vector),but slightly increased its activation energy from∼0.65 to∼0.71 *** the other hand,high-resolution scanning transmission electron mi-croscopy observations reveal that the irradiation at the elevated temperature created interstitial atom pair onto the(100)habit plane that can serve as the nucleation site of a100dislocation loop while elim-inating the pre-existing ***,it is indicated that heterogeneous nucleation of the dislocation loop was predominant in the delayed plasticity initiation of this alloy and that the nucleation of the interstitial-type dislocation loop was involved due to Fe^(3+)-irradiation.

关键词： spherical nanoindentation Delayed plasticity FecrAl alloy Fe^(3+)-irradiation

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