(1. 玉林师范学院 物理与信息科学系，玉林 537000；
2. 广西大学 物理科学与工程技术学院，南宁 530004；
3. 中国科学院 国际材料物理中心，沈阳 110016)
摘 要: 测量Zn单晶、Al单晶、铸态Zn60Al40合金以及冷轧Zn、Al、Zn60Al40的符合正电子湮没辐射多普勒展宽谱和寿命谱。结果表明，单晶Zn和铸态Zn60Al40合金的商谱在约17.4×10−3 m0c处出现一个峰，主要是正电子与Zn中3d电子湮没的作用；当Zn原子和Al原子形成Zn60Al40合金时，Zn原子和Al原子间主要以金属键结合；轧制Al的商谱明显低于单晶Al的商谱，冷轧Zn60Al40合金商谱略低于铸态Zn60Al40合金商谱；而单晶Zn和轧制Zn的商谱几乎重叠；Al、Zn金属和Zn60Al40合金经冷轧后，由于样品中产生了缺陷，而导致正电子平均寿命增加，轧制Al的增幅最大，轧制Zn60Al40合金的增幅次之，而轧制Zn的增幅最小。
关键字: Zn60Al40合金；3d电子；微观缺陷；正电子湮没
Zn-40Al alloy
（1. Department of Physics and Information Sciences, Yulin Normal College, Yulin 537000, China;
2. College of Physics Science and Technology, Guangxi University, Nanning 530004, China;
3. International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The coincidence Doppler broadening spectra and positron lifetime were measured in single crystals of Al, Zn, as-cast Zn60Al40, and cold-rolled Al, Zn, Zn60Al40. The results show that there is a peak at about 17.4×10−3 m0c in the ratio curves of the single crystal of Zn and the as-cast Zn60Al40 alloy, and it is due to the contribution of positron annihilation with 3d electrons of Zn atoms. The bonding nature in a Zn60Al40 alloy is metallic when Zn and Al atoms combine to form the alloy. The ratio curve of cold-rolled Al is obviously lower than that of the single crystal Al, and the ratio curve of cold-rolled Zn60Al4 is slightly lower than that of the as-cast Zn60Al40, while the ratio curve of cold-rolled Zn is almost super-imposed with that of the single crystal Zn. The microdefects in Al, Zn and Zn60Al40 are introduced after these samples are cold-rolled, which gives rise to the increase of positron lifetime. The magnitude of lifetime of cold-rolled Al is the largest, that of the cold-rolled Zn60Al40 is the second and that of the cold-rolled Zn is the smallest.
Key words: Zn60Al40 alloy; 3d electrons; microdefects; positron annihilation
