Positron annihilation study of the Mg-Zn-Y alloys with long period stacking ordered (LPSO) structures

被引：7

作者：

Xu, H. X. ^{[1
,2
,4
]}

Inoue, K. ^{[1
]}

Nagai, Y. ^{[1
]}

Toyama, T. ^{[1
]}

Matsukawa, Y. ^{[1
]}

Kuramoto, A. ^{[1
]}

Egusa, D. ^{[3
]}

Abe, E. ^{[3
]}

Ye, B. J. ^{[2
,4
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Oarai Ctr, Oarai, Ibaraki 3111313, Japan

[2] Univ Sci & Technol China, State Key Lab Particle Detect & Elect, Hefei 230026, Peoples R China

[3] Univ Tokyo, Dept Mat Engn, Tokyo 113, Japan

[4] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China

来源：

16TH INTERNATIONAL CONFERENCE ON POSITRON ANNIHILATION (ICPA-16) | 2013年 / 443卷

关键词：

STRENGTH;

D O I：

10.1088/1742-6596/443/1/012029

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

The Mg-Zn-Y alloys with long period stacking ordered (LPSO) structures have been studied by positron annihilation lifetime (PAL), coincidence Doppler broadening (CDB) and atom probe tomography (APT). The positron lifetime for all the Mg-Zn-Y alloys is in a range of 221 similar to 225 ps, very close to the positron lifetime for pure Mg bulk, 222 ps. Low temperature measurements of the positron lifetime also give no evidence for shallow positron trapping sites in the LPSO phases. The CDB shows that most of the positrons are annihilated with electrons of Mg. These results suggest that sub-nano scale open volumes, which were expected to exist in the Zn/Y enriched layers synchronized with stacking faults of the LPSO phases by the first principles calculations, are not present.

引用

页数：4

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