DENG Wen XIONG Liangyue LONG Qiwei International Centre for Materials Physics
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
ChinaWANG Shuhe GUO Jianting Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
The behuviour of B atoms added to mono-and poly-crystalline Ni_3AI alloys has been investi- gated hy positron annihilation technique(PA T).If the additive of B was less than 1.37 at-%, some of B atoms solid-solutioned interstitially into matrix and distorted the lattice,thus the lifetime (τ) of positron (e~+) Or matrix dilated:the others of them segregated on vacancy-like defects and formed "filling effect",thus the mean lifetime (τ)and S parameters decreased.If B added was increased up to 2.22 at-%,more defects having larger free volume were induced by horide eutectic occurred along grain boundaries and grain interior,thus the τ in vacancy-like defects.τ and S parameters increased remarkably.
关键词:
Ni_3Al
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null
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