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STUDY OF RECOVERY IN DEFORMED Ni-Cr-Co SUPERALLOYS USING POSITRON ANNIHILATION

DENG Wen XIONG Liangyue LONG Qiwei Institute of Metal Research , International Centre for Materials Physics , Academia Sinica , Shenyang , China Associate Professor , Institute of Metal Research , Academia Sinica , Shenyang 110015 , China

金属学报(英文版)

The recovery recrystallization of 3 deformed Ni-Cr-Co superalloys with different Co con- tents has been studied using positron annihilation technique and TEM.The alloys with low Co content have more defects occurred than ones with high Co content,and the former may be faster in dislocation recovery than the latter.Thus,the apparent activation energy of recrystallization increases with the increase of their Co content in alloys.The relationship be- tween apparent activation energy and stacking fault energy together with their effect on re- covery were also discussed.

关键词: positron annihilation , null , null , null

ON DISCONTINUOUS REINFORCED NiAl-BASED COMPOSITES

CHENG Tianyi (Metal Materials Section , Beijing Institute of Technology , P.O.Box 327 , China , International Centre for Materials Physics , Academia Sinica , Shenyang 110015) , China

金属学报(英文版)

Mechanically alloyed NiAl-TiB_2-Y_2O_3 composite (volume percentage of dispersoids about 15v%) was prepared by hot pressing. The compressive properties of the composite from 300 K to 1360 K were tested and the microstructures were studied mainly by TEM. The yield strengths of the composite at room temperature and high temperatures are considerably higher than that of monolithic NiAl and also is higher than similar NiAl-based composites which contained higher content of dispersoids but showed coarser microstructure. The possible strengthening mechanisms working in the composite are discussed.

关键词: : NiAl , null , null

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