摘要
本文用正电子湮没技术(PTA)研究了含不同zr量多晶Ni3Al的e+寿命谱。结果表明:在Ni3Al中加入Zr,一部分Zr原子进行原子替位,使晶格发生畸变,导致基体中正电子寿命(τ_1)增长;另一部分在晶界偏聚的Zr调整了晶界结构,使平均寿命(τ)下降。当Zr量为1.2at.-%时,缺陷态的寿命τ2显著增长,表明有自由体积较大的缺陷组态生成.
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.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1995年第5期B238-B240,共3页
Acta Metallurgica Sinica
基金
国家自然科学基金