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Novel interface regulation of Sn1.0Ag0.5Cu composite solders reinforced with modified ZrO_(2):Microstructure and mechanical properties

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Journal of Materials Science & Technology 2022年第30期125卷 157-170页

作者： Fupeng Huo Zhi Jin Duy Le Han Jiahui Li Keke Zhang Hiroshi Nishikawa Joining and Welding Research Institute Osaka UniversityIbarakiOsaka 565-0047Japan Graduate School of Engineering Osaka UniversitySuitaOsaka 565-0871Japan School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China Department of Welding Engineering and Metals Technology School of Mechanical EngineeringHanoi University of Science and TechnologyNo.1 Dai Co VietHai Ba TrungHanoiViet Nam

With the trends of miniaturization and high density of electronic packaging,there has been an urgent demand to open up lead-free solders with high strength and ductility.In this study,a ZrO_(2)-reinforced Sn1.0Ag0.5Cu composite solder was designed.First,surface modification on ZrO_(2) was conducted with ball milling-pyrolysis method.Subsequently,NiO modified ZrO_(2)(NiO/ZrO_(2))was added to the solder matrix with ultrasonic stirring.The morphology and interface of NiO/ZrO_(2) were discussed.Moreover,the microstructure,interface and mechanical properties of the composite solders were systematically studied.The results showed that NiO nanoparticles were evenly adhered to the ZrO_(2) surface,and the interface relationship between them was semi-coherent and coherent.Further,an appropriate addition of NiO/ZrO_(2) could refine the microstructure of composite solders.The refinement mechanism was systematically investigated.Besides,a micro-mechanical lock and non-micropored clean interface was formed between NiO/ZrO_(2) and the solder matrix.The Sn/NiO/ZrO_(2) interface system based on mutual solid solution was ingeniously designed.The ultimate tensile strength and elongation were increased synergistically,and the fracture mechanism transformed from a ductile−brittle mixed fracture mode to a ductile fracture mode.Therefore,a lead-free solder with high strength and ductility was obtained.

关键词： SnAgCu composite solder ZrO_(2)nanoparticles Refinement mechanism Surface modification Interface reinforcements

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Bio Caryota Fiber Reinforced Polymer Composites: Mechanical Properties and Vibration Behavior Analysis

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Journal of Bionic Engineering 2019年第3期16卷 480-491页

作者： Kayaroganam Palanikumar Vijayakumar Subbiah Department of Mechanical Engineering Sri Sai Ram Institute of Technology Chennai Tamil Nadu India Department of Mechanical Engineerings Sathyabama Institute of Science and Technology Chennai Tamil Nadu India

Polymer composites reinforced with the biofibers are found to have improved applications in many fields and also they can reduce the environmental effect. In this work, caryota-a new natural fiber for polymer composites is fabricated and their tensile, flexural and impact properties are estimated to be used in economical and lightweight load carrying structures. Laminates at different weight fraction (wt%) of 10 wt%, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt% and 45 wt% are manufactured using a compression molding technique. Results asserted that the unidirectional arrangement having 40 wt% fiber posses good properties. Also the dynamic characteristics such as natural frequency and damping study are carried out for different wt% of unidirectional caryota fiber reinforced composite laminates by ex? perimental modal analysis. From this study, it has been asserted that by using the caryota fiber reinforced polyester composites, the traditional synthetic fiber can be replaced especially in automobile sector. If the caryota fiber reinforced composite material is applied properly, then its application fields will be improved.

关键词： natural fiber caryota fiber reinforcements polymer-matrix composites (PMCs) mechanical properties vibration analysis

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Microstructure and mechanical properties of a hot-extruded Al-based composite reinforced with core–shell-structured Ti/Al3Ti

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International Journal of Minerals,Metallurgy and Materials 2017年第12期24卷 1431-1437页

作者： Li Zhang Bao-lin Wu Yu-lin Liu School of Materials Science and Engineering Shenyang Aerospace UniversityShenyang 110136China Liaoning Key Laboratory of Aviation Light Alloy and Processing Technology Shenyang Aerospace UniversityShenyang 110136China

An Al-based composite reinforced with core–shell-structured Ti/Al_3Ti was fabricated through a powder metallurgy route followed by hot extrusion and was found to exhibit promising mechanical properties. The ultimate tensile strength and elongation of the composite sintered at 620°C for 5 h and extruded at a mass ratio of 12.75:1 reached 304 MPa and 14%, respectively, and its compressive deformation reached 60%. The promising mechanical properties are due to the core–shell-structured reinforcement, which is mainly composed of Al_3Ti and Ti and is bonded strongly with the Al matrix, and to the reduced crack sensitivity of Al_3Ti. The refined grains after hot extrusion also contribute to the mechanical properties of this composite. The mechanical properties might be further improved through regulating the relative thickness of Al–Ti intermetallics and Ti metal layers by adjusting the sintering time and the subsequent extrusion process.

关键词： microstructure aluminum-based composites Ti/Al3Ti reinforcements mechanical properties

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Properties of Scaffold Reinforcement for Tendon Tissue Engineering in vitro Degradation

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Journal of Donghua University(English Edition) 2013年第5期30卷 352-355页

作者：龚泽张佩华王文祖罗云蔚 Key Laboratory of Textile Science and Technology Ministry of EducationDonghua University Colleges of Textiles Donghua University

Four kinds of braided yarns were produced with different proportions of polyglycolic acid( PGA) and polylactic acid( PLA)multifilaments( 2PGA /1PLA, 2PGA /2PLA, 3PGA /1PLA, and3PGA /2PLA). A novel artificial plain stitch scaffold reinforcement was manufactured by braiding technology and knitting technology respectively. Tendon scaffold reinforcements were investigated for 8weeks in phosphate buffered solution( PBS)( pH = 7. 4) at 37 ℃.The degradation was studied with regard to the mass loss,tensile properties,grams per square meter( g /m2),thickness,caliber,and porosity of scaffold reinforcements. The experimental showed that during the process of 8-week degradation,the mass losses of scaffold reinforcements were small in the first 3-week,but they increased rapidly after 3-week,and the speeds tended to be small gradually after 6-week; the tensile properties dropped rapidly in the first 2-week; the grams per square meter and thicknesses speeded down obviously between 3-week to 6-week. The caliber and porosity of scaffold reinforcements first decreased and then increased gradually. The porosity can reach more than 97%.

关键词： polyglycolic acid(PGA) polylactic acid(PLA) tendon scaffold reinforcements degradation in vitro properties

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