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γ″Precipitate in Inconel 718

Jianhong HE (Dept. of Mater. Sci. and Eng. , Tsinghua University , Beijing , 100084 , China)S.Fukuyama and K. Yokogawa (Chugoku National Industrial Research Institute , Hiro-suehiro 2-2-2 , Kure , Hiroshima , 737-01 , Japan (To whom correspondence should be addres

材料科学技术（英）

The γ"precipitate in Inconel 718 Ni-base superalloy has been investigated using TEM. Based on a calculation of diffraction pattern. the orientation relations between precipitates and matrix are given in detail. The influence of solution temperature on growth of γ" precipitates was investigated. and a γ" precipitate free area near δ phase was found. The coarsening behaviour of γ" precipitates during short time aging is discussed

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Effects of Sintering on the Microstructure and Critical Current Density of Ag-sheathed BiPbSrCaCuO Superconducting Tapes

Junhua LIU+ , Dept. of Manufacturing Engineering , Beijing University of Aeronautics and Astronautics , Beijing 100083 , ChinaZutang WANG , Dept. of Mechanical Engineering , Tsinghua University , Beijing , 100084 , China

材料科学技术（英）

The effects of sintering on the microstructure and the critical current density of Ag-sheathed BiPbSrCaCuO (2223) superconducting tapes prepared by the powder-in-tube technique were in- vestigated. The microstructure of oxide layer and the J_C at 77 K were strongly dependent on the sintering condition. The optimum sintering temperature, time and cooling rate to maximize J_C values were in the range about 840-850℃, 100-200 h and 50-100℃/h, respectively.

关键词: BiPbSrCaCuO , null , null , null

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