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Microstructure Characteristics,Texture Evolution and mechanical Properties of Al-Mg-Si-Mn-xCu Alloys via Extrusion and Heat Treatment

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Acta Metallurgica Sinica(English Letters) 2024年第9期37卷 1501-1522页

作者： Zulai Li Yingxing Zhang Junlei Zhang Xiang Chen Suokun Chen Lujian Cui Shengjie Han College of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China College of Materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002China National and Local Joint Engineering Laboratory of Advanced Metal Solidification Forming and Equipment Technology Kunming University of Science and TechnologyKunming 650093China Chinalco International Al Application Engineering Co. Ltd.Beijing 100089China

In this work,the impact of extrusion and post-extrusion heat treatment(T6)on the microstructure and mechanical properties of the Al-1.2Mg-0.8Si-0.5Mn alloy with different Cu contents(0,0.6,1.3 and 2.0 wt%)was *** characterization showed that all extruded alloys exhibited elongated grain structure with an average grain size of~4.8μ*** dominant texture components were deformation texture(A*,Copper and P texture),while the proportion of random texture initially increased and then decreased with increasing Cu *** T6 treatment,the grain size of the four alloys increased significantly,but the growth trend decreased with increasing Cu content,and the textures transformed into recrystallized textures(Cube,A and Goss texture).Tensile testing revealed that the designed T6 alloys with 2.0%Cu content exhibited an excellent strength-ductility balance,i.e.,a yield strength of 342.9 MPa,an ultimate tensile strength of 424.8 MPa and an elongation of 15.9%.The enhanced strength was mainly attributed to fine grain strengthening,solid solution strengthening and aging strengthening *** superior ductility was due to the pinning effect of fine precipitates and high dislocation accommodation capacity caused by heat treatment.

关键词： Al-Mg-Si-Mn alloy Cu addition Microstructure texture mechanical Properties

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Phase structure evolution and its effect on magnetic and mechanical properties of B-doped Sm_(2)Co_(17)-type magnets with high Fe content

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Chinese Physics B 2024年第9期33卷 582-588页

作者： Yao-Wen Li Zhuang Liu Hai-Chen Wu Fang Wang Chao-Qun Zhu Dong-Liang Tan Yu Liu Yang Yang Ming-Xiao Zhang Ren-Jie Chen A-Ru Yan Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry ofEducation&School of Chemistry and Materials Science Shanxi Normal UniversityTaiyuan 030032China CISRI&NIMTE Joint Innovation Center for Rare Earth Permanent Magnets Ningbo Institute ofMaterial Technology and EngineeringChinese Academy of SciencesNingbo 315201China University of Chinese Academy of Sciences Beijing 100049China

The unique cellular microstructure of Fe-rich Sm_(2)Co_(17)-type permanent magnets is closely associated with the structure of the solid solution *** investigate the phase structure,magnetic properties,and mechanical behavior of B-doped Sm_(2)Co_(17)-type magnets with high Fe *** doped B atoms can diffuse into the interstitial vacancy,resulting in lattice expansion and promote the homogenization of the phase organizational structure during the solid solution treatment in ***,the resulting second phase plays a dominant role to result in more microtwin structures and highly ordered 2:17R phases in the solid solution stage,which inhibits the ordering transformation of 1:7H phase during aging and affects the generation of the cellular structure,and to result in a decrease in magnetic properties,yet the interface formed between it and the matrix phase hinders the movement of dislocations and enhances the mechanical ***,the precipitation of high flexural strain grain boundary phase induced by B element doping is also a new and effective way to improve the flexural strain of Sm_(2)Co_(17)-type *** study provides a new understanding of the phase structure evolution and its effect on the magnetic and mechanical properties of Sm_(2)Co_(17)-type magnets with high Fe content.

关键词： Sm_(2)Co_(17)-type magnets magnetic and mechanical properties

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mechanical Properties and Thermal Shock Resistance of SrAl_(2)Si_(2)O_(8) Reinforced BN Ceramic Composites

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无机材料学报 2024年第10期39卷 1182-1188页

作者： WANG Bo CAI Delong ZHU Qishuai LI Daxin YANG Zhihua DUAN Xiaoming LI Yanan WANG Xuan JIA Dechang ZHOU Yu International Joint Laboratory of Advanced Nanomaterials of Heilongjiang Province College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China Key Laboratory of Advanced Structural-Functional Integration Materials School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China China Resources Cement Technology R&D Co. LtdGuangzhou 510000China The First Military Representative Office of the Army Equipment Department in Beijing Beijing 100072China The Fourth System Design Department Fourth AcademyChina Aerospace Science and Industry Corporation LimitedBeijing 100048China School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Hexagonal boron nitride(h-BN)ceramics have become exceptional materials for heat-resistant components in hypersonic vehicles,owing to their superior thermal stability and excellent dielectric ***,their densification during sintering still poses challenges for researchers,and their mechanical properties are rather *** this study,SrAl_(2)Si_(2)O_(8)(SAS),with low melting point and high strength,was introduced into the h-BN ceramics to facilitate the sintering and reinforce the strength and ***,BN-SAS ceramic composites were fabricated via hot press sintering using h-BN,SrCO_(3),Al_(2)O_(3),and SiO_(2) as raw materials,and effects of sintering pressure on their microstructure,mechanical property,and thermal property were *** thermal shock resistance of BN-SAS ceramic composites was *** show that phases of as-preparedBN-SAS ceramic composites are h-BN and h-SrAl_(2)Si_(2)O_(8).With the increase of sintering pressure,the composites’densities increase,and the mechanical properties shew a rising trend followed by a slight *** a sintering pressure of 20 MPa,their bending strength and fracture toughness are(138±4)MPa and(1.84±0.05)MPa·m^(1/2),*** sintered at 10 MPa exhibit a low coefficient of thermal expansion,with an average of 2.96×10^(-6) K^(-1) in the temperature range from 200 to 1200℃.The BN-SAS ceramic composites prepared at 20 MPa display higher thermal conductivity from 12.42 to 28.42 W·m^(-1)·K^(-1) within the temperature range from room temperature to 1000℃.Notably,BN-SAS composites exhibit remarkable thermal shock resistance,with residual bending strength peaking and subsequently declining sharply under a thermal shock temperature difference ranging from 600 to 1400℃.The maximum residual bending strength is recorded at a temperature difference of 800℃,with a residual strength retention rate of 101%.As the thermal shock temperature difference increase,the degree of oxida

关键词： BN matrix composite hot-press sintering mechanical property thermal shock resistance service reliability

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Massive abdominal muscle atrophy during prolonged mechanical ventilation: Implications for tracheostomy removal

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Journal of Intensive Medicine 2024年第1期4卷 133-135页

作者： Pascal Beuret Florian Michelin Audrey Tientcheu Laurane Chalvet Benedicte Philippon-Jouve Jean-Charles Chakarian Xavier Fabre Service de Réanimation et Soins continus Centre Hospitalier de RoanneRoanneFrance

Introduction Maintaining the functional integrity of respiratory muscles is crucial for critically ill patients to be weaned from mechanical ventilation and decannulated if *** of the diaphragm is frequent in patients under mechanical ventilation and has been associated with a longer duration of weaning.[1,2]Studies on expiratory muscles are *** recent studies demonstrated the feasibility and reproducibility of ultrasound in measuring the thickness of abdominal muscles,[3,4]with one study showing abdominal muscle atrophy in 22%of mechanically ventilated critically ill patients during the first week of mechanical ventilation.[4]

关键词： critically mechanical abdominal

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mechanical properties and corrosion behavior of selective laser melted 316L stainless steel after different heat treatment processes

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Journal of Materials Science & Technology 2019年第7期35卷 1499-1507页

作者： Decheng Kong Chaofang Dong Xiaoqing Ni Liang Zhang Jizheng Yao Cheng Man Xuequn Cheng Kui Xiao Xiaogang Li Beijing Advanced Innovation Center for Materials Genome Engineering Key Laboratory for Corrosion and Protection (MOE)Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Shanghai Engineering Research Center of 3D Printing Materials Shanghai Research Institute of MaterialsShanghai 200437China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China

Irregular grains, high interfacial stresses and anisotropic properties widely exist in 3D-printed metallic materials, and this paper investigated the effects of heat treatment on the microstructural, mechanical and corrosion properties of 316 L stainless steel fabricated by selective laser melting. Sub-grains and low-angle boundaries exist in the as-received selective laser melted(SLMed) 316 L stainless steel. After heat treatment at 1050℃, the sub-grains and low-angle boundaries changed slightly, and the stress state and strength decreased to some extent due to the decrease of dislocation density. After heat treatment at 1200℃, the grains became uniform, and the dislocation cells vanished, which led to a sharp decline in the hardness and strength. However, the ductility was improved after recrystallization heat *** passive film thickness and corrosion potential of the SLMed 316 L stainless steel decreased after heat treatment, and the pitting potential also decreased due to the accelerated transition from metastable to steady-state pitting;this accelerated transition was caused by the presence of weak passive films at the enlarged pores after heat treatment, especially for an adequate solid solution treatment.

关键词： 316L stainless steel Selective laser melting Heat treatment Microstructure mechanical property Corrosion behaviour

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mechanical properties of 65Mn chiral structure with three ligaments

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Acta Mechanica Sinica 2019年第1期35卷 88-98,I0003页

作者： X.W.Su D.M.Zhu C.Zheng M.M.Tomovic School of Technology Beijing Forestry UniversityBeijing 100083China School of mechanical Engineering University of Science and Technology BeijingBeijing 100083 China Batten College of Engineering and Technology Old Dominion University Norfolk VA 23529 USA

Chiral honeycomb structures have been developed in recent years, showing excellent mechanical properties, including in-plane deformation and out-of-plane bearing and vibration isolation. In this study, the 65Mn chiral structure with three ligaments was modeled and analyzed using the finite element (FE) method. The effects of the dimensionless ligament length and dimensionless ligament thickness on the in-plane equivalent elastic modulus, equivalent Poisson's ratio, and out-of-plane shear modulus were studied. The numerical results indicate that increase of the dimensionless ligament length leads to decrease of the equivalent elastic modulus and increase of the equivalePoisson's ratio, whereas the out-of-plane equivalent shear modulus decreases. The results also indicate that increase of the dimensionless ligament thickness leads to in crease of the equivalent elastic modulus, whereas the equivalent Poisson's ratio remains nearly unchanged and the out-of-plane equivalent shear modulus shows a linear in crease. The numerical results are verified by comparis on with published experime ntal data. These results will provide a reference for the application of chiral structures with three ligaments in the aerospace field.

关键词： Chiral structure with three ligaments mechanical properties Finite elemern method

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mechanical and Damping Behavior of Age-Hardened and Non-age-hardened Al Alloys After Friction Stir Processing

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Acta Metallurgica Sinica(English Letters) 2019年第9期32卷 1135-1141页

作者： Hiang-Jie Jiang Bing Zhang Chong-Yu Liu Zhen-Xing Yang Zong-Yi Ma College of Material Science and Engineering Guilin University of TechnologyGuilin 541004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Alnan Aluminium Co. Ltd.Nanning 530031China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

This study investigated the microstructure,mechanical,and damping properties of a non-age-hardened Al alloy(5086)and an age-hardened Al alloy(7075)after friction stir processing(FSP).Microstructural analyses indicate that FSP led the grain refinement of samples,and the grains size decreased with the decrease in the tool rotation ***,FSP with low rotation rate promotes theηphase precipitation in the 7075 alloy,causing the micron-sized particles in the 5086 alloy to break *** being subjected to FSP with low rotation rate,the 5086 and 7075 alloys exhibited excellent mechanical and damping *** improved properties were ascribed to their equilibrium grain boundaries,fine grain,low density of dislocations,high fraction of high misorientation angle,and uniform particle distribution.

关键词： Aluminum alloy mechanical properties Damping

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mechanical properties and thermal stability of carbon fiber cloth reinforced sol-derived mullite composites

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Journal of Advanced Ceramics 2019年第2期8卷 218-227页

作者： Wei ZHANG Qingsong MA Kuanhong ZENG Songlin LIANG Weiguo MAO School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105HunanChina Science and Technology on Advanced Ceramic Fibers&Composites Laboratory National University of Defense TechnologyChangsha 410073China

For the wide application as thermal protection materials,it is very necessary for mullite ceramics to improve fracture *** this paper,the laminated and stitched carbon fiber cloth preform reinforced mullite(C/mullite)composites were prepared through the route of sol impregnation and heat treatment using the Al2O3-SiO2 sol with a high solid content as raw *** C/mullite composites showed a flexural strength of 228.9 MPa that was comparable to that of dense monolithic mullite although the total porosity reached 13.4%.Especially,a fracture toughness of 11.2 MPa·m1/2that was 4–5 times that of dense monolithic mullite was *** deterioration due to the carbothermal reduction between carbon fiber and the residual SiO2 in matrix was found above 1200℃.A pyrolytic C(Py C)coating was deposited on carbon fibers as interfacial *** chemical damage to carbon fibers was obviously alleviated by the sacrifice of PyC ***,the C/PyC/mullite composites kept strength unchanged up to 1500℃,and showed much higher strength retention ratio than C/mullite composites after annealing at 1600℃.

关键词： carbon fiber reinforced mullite composite sol mechanical property thermal stability

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mechanical analysis of C/C composite grids in ion optical system

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Applied Mathematics and Mechanics(English Edition) 2019年第11期40卷 1589-1600页

作者： Shuiqiang ZHANG Aijun LI Yuqin ZHENG Dongsheng ZHANG School of Engineering Huzhou UniversityHuzhou 313000Zhejiang ProvinceChina Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai 200072China Research Center for Composite Materials Shanghai UniversityShanghai 200444China Department of Mechanics Shanghai UniversityShanghai 200444China

The ion thruster is an engine with high specific impulse for satellites and spacecrafts,which uses electric energy to boost the *** ion optical system,also known as gate assemblies which consist of acceleration and screen grids,is the key component of the ion *** this paper,the static mechanical properties of the C/C composite grids are evaluated based on the structural *** volume element (RVE) is adopted to simplify the braded composite structure as a continuum *** dynamical behavior of the 100 mm ion thruster optics in the launch environment (1000g shock-load) is numerically modeled and simulated with the half-sine pulse *** impact response of the C/C and molybdenum gate assemblies on the stress distribution and deformation is *** simulated results indicate that the magnitudes of the normal displacement of the composite grids subject to the uniformly distributed load are on the same level as molybdenum grids although the normal stiffness of the composite grids is much *** subject to impact loading,the stress distribution in the C/C composite grids is similar to molybdenum grids while the stress magnitude is much *** finding shows that the C/C gate assemblies outperform molybdenum grids and meet the requirement of long lifetime service in space travel.

关键词： ion optical system C/C composite grid mechanical analysis

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mechanical and dielectric properties of porous and wave-transparent Si3N4–Si3N4 composite ceramics fabricated by 3D printing combined with chemical vapor infiltration

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Journal of Advanced Ceramics 2019年第3期8卷 399-407页

作者： Zanlin CHENG Fang YE Yongsheng LIU Tianlu QIAO Jianping LI Hailong QIN Laifei CHENG Litong ZHANG Science and Technology on Thermostructure Composite Materials Laboratory Northwestern Polytechnical University

Porous Si3N4–Si3N4 composite ceramics were fabricated by 3D printing combined with low-pressure chemical vapor infiltration(CVI).This technique could effectively improve the designability of porous Si3N4 ceramics and optimize the mechanical and dielectric *** effects of process parameters including the deposition time and heat treatment on the microstructure and properties of porous Si3N4–Si3N4 composite ceramics were *** study highlights following:When CVI processing time was increased from 0 to 12 h,the porosity decreased from68.65%to 26.07%and the density increased from 0.99 to 2.02 g/*** the same time,the dielectric constant gradually increased from 1.72 to 3.60;however,the dielectric loss always remained less than0.01,indicating the excellent electromagnetic(EM)wave-transparent performance of porous Si3N4–Si3N4 composite *** maximum flexural strength of 47±2 MPa was achieved when the deposition time attained 6 *** heat treatment,the porosity increased from 26.07%to 36.02%and the dielectric constant got a slight increase from 3.60 to 3.70 with the dielectric loss still maintaining lower than *** has been demonstrated that the porous Si3N4–Si3N4 composite ceramics are a promising structural and EM wave-transparent material suitable for high temperature service.

关键词： porous Si3N4 ceramics Si3N4–Si3N4 composite ceramics mechanical property electromagnetic(EM) wave transparent performance 3D printing chemical vapor infiltration(CVI)

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