PAT STUDY OF EFFECT OF Zr ON DEFECTS IN Ni_3Al ALLOY
GU Yuefong; DENG Wen; GUO Jianting; (Institute of Meial Research; Chinese A cademy of Sciences; Shenyang 110015)XIONG Liangyue; LIN Dongliang (Institute of Metal Research; Chinese A cademy Sciences. Shenyang 110015)(Shanghai Jiaoiong University; Shanghai 200030)
Cite this article:
GU Yuefong; DENG Wen; GUO Jianting; (Institute of Meial Research; Chinese A cademy of Sciences; Shenyang 110015)XIONG Liangyue; LIN Dongliang (Institute of Metal Research; Chinese A cademy Sciences. Shenyang 110015)(Shanghai Jiaoiong University; Shanghai 200030). PAT STUDY OF EFFECT OF Zr ON DEFECTS IN Ni_3Al ALLOY. Acta Metall Sin, 1995, 31(17): 238-240.
Abstract The effects of Zr on the microdefects in polycrystalline Ni3Al alloys have been investigated by positron annihilation technique (PAT). The results showed that the lifetime (t1) of positron (e+) in matrix dilated because some of Zr atoms substituted for Al sublattice distorted lattice; the mean lifetime decreased because the others of Zr atoms segregated at GB changed its structure. If Zr was increased up to 1.2 at.-%.t2 increased considerably and it means that defects with larger free volume formed.
