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THE CALCULATION OF BaO ACTIVITIES IN BaO-BaF_2-Cr_2O_3 SYSTEM FLUXES USING SCHUHMANN METHOD

L.F. Li , Z.P. Chen , M.F. Jiang and W.Z. Wang(Department of Ferrous Metallurgy , School of Materials and Motallurgy , Northeastern University Shenyang 110006 , China)(The Technology Center , Baoshan Iron & Steel Complex , Shanghai 201900 , China)

金属学报(英文版)

The principle and steps for the calculation of component activities in fluxes using Schuhmann method are described. On the foris of Gibbs-Duhem equation and using Cr2O3 activities in BaO-BaF2-Cr2O3 system fiuxes, BaO activities at 1523 and 1673K are calculated, respectivelg,and the isoactivity diagrums of BaO are also obtained. The calculation results indicate that BaO activity increases with increasing its content in fiuxes, and decreaaes with the increase of Cr2O3 content at a given XBaO/XBaF2 ratio.

关键词: Shuhmann method fluxes , null , null

Positron Annihilation Study on the Microstructural Stability in Rapidly Solidified Al_(92.3)Fe_(4.3)V_(0.7)Si_(1.7)Mm_(1.0) Alloy

Wei JIA , Meikuang Tseng and Jianqiang WANG(Dept. of Material Science , Northeastern University Shenyang 110006 , China)Liangyue XIONG and Yelong CHU(International Ceoter for Materials Physics , Institute of Metal Research , Chinese Academy of Sciences , Shenyan

材料科学技术（英文）

Rapidly solidified Al92.3Fe4.3V0.7Si1.7Mm1.0 alloy has been studied by positron lifetime spectroscopy and the variations on the intedecial defects with the annealing temperature were revealed by an analysis of the lifetime results. The intedece characteristics derived from the positron-lifetime results could be used to give a satisfactory interpretation of the dependence of mechanical properties on the annealing temperature

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Mechanical Alloying of Fe_(100-x) B_x

Lizhi CHENG , Wei FENG , Xinquan DONG , Kuichang BAI and Kaiyuan HE (Dept. of Materials Science and Engineering , Northeastern University Shenyang 110006 , China)

材料科学技术（英文）

The formation of nonequilibrium phase by mechanical alloying (MA) of Fe and B powders in a high energy vibration ball mill has been made for Fe100-xBx system with x=15. 30, 35, 45,55 and 70. By using the X-ray diffraction, magnetic measurement and M6ssbauer spectrummethods, it was revealed that the structure of the MA product varies with milling time and B contents.

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ANN Optimization Method for High Strength High Fracture Toughness Steels

Ping GENG , Meikuang Tseng and Cunfu QIAN(College of Science , Northeastern University Shenyang 110006 , China)

材料科学技术（英文）

The two-target optimization problem for high strength high fracture toughness steels has been investigated. An effective method for two-target optimization of multi-variable non-linear complicated system is developed by combining simulated annealing algorithm with artificial neural network

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SUPERPLASTICAL DEFORMATION AND FRACTURE MECHANISM 0F A SiC_p/2024Al COMPOSITE

Y. Yan , C.B. Zhang and B.R. Liu (Box 104 , College of Science , Northeastern University Shenyang 110006 , China)

金属学报(英文版)

Soperplastic tensions on an IM SiCp/2024Al composite were conducted. The microstrvcture and fmcture sudece of the composite under the optimum saperplastic deformation condition were examined. The eoperimental results show that as the increase of strain during superpldstic deformation, grains fundarnentally remained equiaxed structure, and dislocation density increases gradually and its structure changes hem intererossed into nets each other to tangled and cellular structure,and the amount of liquid phase at the intedeces or gruin boundaries increases gradually. Mcrostructure examination revealed that failure took place by damage accumulation of the pmpressive decohesion of the SiC particle-matrix until a critical volume fruction was reached.

关键词: composite , null , null

Stoichiometric NbTiAl_3 (γ1 Phase) Alloy in Ti-Al-Nb Ternary System

Jingxia CAO , Jinjun DING and Shiming HAO (Dept. of Materials Science and Technology , Northeastern University Shenyang 110006 , China)(To whom correspondence should be addressed)Guoliang CHEN (Dept. of Materials Science and Technology University of Science

材料科学技术（英文）

The microstructure and phase constitution in stoichiometric NbTiAl3 (γ1 phase) alloy treated at 1000℃ were examined by metallography and X-ray diffraction. The alloy microstructure is mainly γ1 phase containing η second phase [(Ti,Nb)Al3] less than 1%. DTA analysis shows no phase transformation from room temperature to 1200℃. In the diffusion couple of NbTiAl3 with 7-TiAl compound, clear phase boundary and composition jump exist between γ1 and γ phase.These results further confirm the existence of γ1 single phase at 1000℃ in Ti-Al-Nb ternary system.

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