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Sintering kinetics involving grain growth and densification of Mg-PSZ nanopowders

Journal of Iron and Steel Research International 2022年第7期29卷 1138-1144页

作者： Yi-ming She Jie-fu Lang Di An Chao-wei Si Xu-dong Luo Zhi-peng Xie Jie-gang You School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina Institute of Advanced Structures Beijing Institute of TechnologyBeijing 100081China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Sintering kinetics have been found to be effective in judging the evolution of *** using magnesium oxide-partially stabilized zirconia(Mg-PSZ)powder prepared by co-precipitation as raw materials,the evolution of densification and grain growth for Mg-PSZ ceramics were *** results indicated that the densification of samples was mainly controlled by grain boundary diffusion in intermediate sintering *** the sintering process,the grain growth mechanisms included normal grain growth,abnormal grain growth and solid solution drag-controlled grain ***,the apparent activation energy for grain growth of Mg-PSZ ceramics is lower than that of ZrO_(2)–Y_(2)O_(3)ceramics in the solid solution drag-controlled grain grow process,which will cause grain to grow *** sintering kinetics and microstructure of Mg-PSZ ceramics were studied,and the kinetic equation of grain growth at different temperatures was *** results show that the strength difference between Mg-PSZ and yttrium oxide-stabilized zirconia is closely related to the easy grain growth of Mg-PSZ ceramics.

关键词： Magnesium oxide-partially stabilized zirconia Sintering kinetics grain growth mechanism Densification mechanism Sizing nozzle

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Densification and grain growth kinetics of boron carbide powder during ultrahigh temperature spark plasma sintering

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Transactions of Nonferrous Metals Society of China 2022年第6期32卷 1948-1960页

作者： Mei ZHANG Wen-jun WANG Tie-chui YUAN Si-yao XIE Rui-di LI Zhi-hui ZHOU Yun-bao XU Science and Technology on High Strength Structural Materials Laboratory State Key Laboratory of Powder MetallurgyCentral South UniversityChangsha 410083China Zhejiang Libo Industrial Co. Ltd.Shaoxing 312000China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China Hunan Institute of Engineering Xiangtan 411100China

Dense B;C material was fabricated using spark plasma sintering(SPS), and the densification mechanisms and grain growth kinetics were revealed. The density, hardness, transverse flexure strength and toughness of samples were investigated and the model predictions were confirmed by SEM and TEM experimental observations. Results show that SPSed B;C exhibits two sintering periods: a densification period(1800-2000 °C) and a grain growth period(2100-2200 °C). Based on steady-state creep model, densification proceeds by grain boundary sliding and then dislocation-climb-controlled mechanism. grain growth mechanism is controlled by grain boundary diffusion at 2100 °C,and then governed by volume or liquid-phase diffusion at 2200 °C.

关键词： boron carbide spark plasma sintering densification mechanism grain growth mechanism grain boundary diffusion

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Novel hard materials with controlled (W_(0.5)Al_(0.5))C grain shapes: in-situ high pressure preparation and mechanical properties

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Acta Metallurgica Sinica(English Letters) 2012年第1期25卷 40-46页

作者： Zhuhui QIA Xianfeng MA Huaguo TANG Wei ZHAO State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academyof Sciences Lanzhou 730000 China CAS Key Laboratory of Rare Earth on Advanced Materials and Valuable Utilization of Resources Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China

A novel hard material with various （W0.5Al0.5）C grain shapes was successfully prepared through mechanical alloying and in-situ high-pressure sintering process. X-ray diffraction apparatus and scanning electron microscopy were used to characterize the phase and the microstructures of the samples. The novel hard materials with ＂fibrous＂, ＂rounded＂ and ＂plate-like＂ grains, which do not contain sharp edges, have the improved mechanical properties. The bulk boundless （W0.5Al0.5）C hard material with various （W0.5Al0.5）C grain shapes possesses good mechanical properties and light weight. The formation mechanism for the non-equilibrium （W0.5Al0.5）C grains during in-situ high-pressure sintering is also discussed.

关键词： Novel hard material Controlled (W0.5Al0.5)C grain In-situhigh-pressure sintering grain growth mechanism

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Effect of welding speed on microstructure and mechanical properties of Al−Mg−Mn−Zr−Ti alloy sheet during friction stir welding

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Transactions of Nonferrous Metals Society of China 2021年第12期31卷 3626-3642页

作者： Tian DING Hong-ge YAN Ji-hua CHEN Wei-jun XIA Bin SU School of Materials Science and Engineering Hunan UniversityChangsha 410082China Hunan Provincial Key Laboratory of Spray Deposition Technology&Application Hunan UniversityChangsha 410082China

Effects of welding speed on the microstructure evolution in the stir zone(SZ)and mechanical properties of the friction stir welding(FSW)joints were studied by OM,XRD,SEM,TEM,EBSD and tensile *** with the base metal(BM),an obviously fine dynamic recrystallization(DRX)microstructure occurs in the SZ and the DRX grain size decreases from 5.6 to 4.4μm with the increasing of welding *** DRX microstructure is mainly achieved by continuous dynamic recrystallization(CDRX)mechanism,strain induced boundary migration(SIBM)mechanism and particle stimulated nucleation(PSN)***,the geometric coalescence and the Burke−Turnbull mechanism are the main DRX grain growth *** all the welding speeds,the joint welded at rotation speed of 1500 r/min and welding speed of 75 mm/min has the greatest tensile properties,*** tensile strength(UTS)of(509±2)MPa,yield strength(YS)of(282±4)MPa,elongation(El)of(23±1)%,and the joint efficiency of 73%.

关键词： friction stir welding mechanical properties dynamic recrystallization nucleation mechanism grain growth mechanism

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