The Calculation of Positron Lifetime in Ni3Al Alloy

Xiang Lei Chen; Wei Feng Guo; Huai Jiang Du; Hui Min Weng; Bang Jiao Ye

doi:10.4028/www.scientific.net/MSF.607.146

Paper Titles

Study of Compensation Defects and Electron Irradiation-Induced Defects in Undoped SI-InP by Positron Lifetime Spectroscopy
p.134

Characterizing Native Point Defects in ZnO Bulk by Positron Annihilation Spectroscopy
p.137

Defects in Electron Irradiation Te-Doped GaSb Studied by Positron Lifetime Spectroscopy
p.140

Defect Study of As-Grown Single Crystal ZnO by Positron
p.143

The Calculation of Positron Lifetime in Ni₃Al Alloy
p.146

Defects in Carbon Allotropes Studied by Positron Annihilation
p.149

Positron Annihilation on the Surfaces of Single Crystals of Si, SiO₂, Graphite and Cu
p.152

Some Problems of the Free Volume Studies in Porous Polymers Using Positron Annihilation and Auxiliary Techniques
p.155

Spontaneous Emission of Positronium Negative Ions from Tungsten (100) Surface
p.161

HomeMaterials Science ForumMaterials Science Forum Vol. 607The Calculation of Positron Lifetime in Ni3Al...

The Calculation of Positron Lifetime in Ni₃Al Alloy

Abstract:

Superposed-neutral-atom model and the finite-difference method (SNA-FD) are used to calculate the positron lifetime of different sizes and types of vacancy clusters in Ni3Al alloy. The calculated positron bulk lifetime in Ni3Al agrees well with the experimental results mentioned in literatures. The positron lifetimes of vacancy clusters with the same amount of vacancy but different components are also calculated. The results show that the positron lifetime is different when its components are different. The positron lifetimes of vacancy clusters with a single element but different sizes are also calculated. The result shows that the positron lifetime is almost a constant when its component is only Al vacancy, but the positron lifetime will increase at first and trend to be a constant when its component is only Ni vacancy.