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Structural evolution of spray-formed Al-70wt.%Si alloys during iso-thermal holding in the semi-solid state

Rare Metals 2005年第4期24卷 317-324页

作者： ZHANG Di CUI Hua WEI Yanguang ZHANG Jishan ZHANG Yongan XIONG Baiqing The State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China General Research Institute for Nonferrous Metals Beijing 100088 China

The grain growth behavior of spray-formed Al-70wt.%Si alloys was studied in the semi-solid state. The specimens were isothermally heat-treated at various temperatures between the solidus and liquidus of Al-Si alloys and then quenched in water. The microstructure of reheated specimens was characterized using optical and scanning electron microscopies. The isothermal holding experiment was carried out to investigate grain growth behavior as a function of holding time and temperature in the semi-solid state. The coarsening mechanism and the effect of porosity on microstructure were also studied.

关键词： materials science grain growth behavior spray forming Al-70wt.%Si alloys semi-solid processing

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The synergistic role of Ti microparticles and CeO_(2) nanoparticles in tailoring microstructures and properties of high-quality Ni matrix nanocomposite coating

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Journal of Materials Science & Technology 2022年第10期105卷 182-193页

作者： Lianbo Wang Shilong Xing Zizhen Shen Huabing Liu Chuanhai Jiang Vincent Ji Yuantao Zhao School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China ICMMO/SP2M Universite Paris-SaclayOrsay 91405France Zhejiang Scientific Research Institute of Transport Hangzhou 310023China Merchant Marine College Shanghai Maritime UniversityShanghai 201306China

In current work,Ni-Ti-CeO_(2) nanocomposite coatings were achieved by co-adding Ti microparticles and CeO_(2) *** experiments and COMSOL computer simulation were applied to reveal the synergistic role of Ti microparticles and CeO_(2) nanoparticles in tailoring the spatial microstructures and properties of Ni-Ti-CeO_(2) nanocomposite ***,the conductive Ti microparticles conducted the growth behavior of Ni grains by current density concentration,distorting electronic feld lines and heterogeneous *** domains consisting of inner nanograins and outer radial columnar grains surrounded Ti microparticles,where Ti microparticles acted as *** microparticles tended to be aggregated,leading to spatial heterogeneity of *** deposits buried the Ti microparticles in forms of“covering model”,contributing to the formation of inside voids and rough surface and aggregation of Ti microparticles;on the other hand,the non-conductive CeO_(2)microparticles hardly changed the distribution of current density and electronic feld lines on the cathode *** deposits buried the CeO_(2)microparticle in forms of“stacking model”,avoiding the inside voids and aggregation of *** incorporation of CeO_(2)microparticle brought in microstructure evolutions only on its top side without disturbing the growth behavior of Ni grains on its lateral side or bottom,suggesting the limited *** was correlated with the presence of current concentration above the CeO_(2) microparticle at the last stage of burying CeO_(2) *** co-addition of Ti microparticles and CeO_(2) nanoparticles into Ni deposits exploited the complementary action of the two particles,which gave birth to satisfed spatial microstructures and improved *** microparticles took major responsibility for microstructure evolutions,while the CeO_(2) nanoparticles were mainly in charge of the microstructure homogeneity.

关键词： Nanocomposite coating CeO_(2)nanoparticle Ti microparticles grain growth behavior COMSOL computer simulation Spatial microstructure and spatial hardness

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