(1. 玉林師范學(xué)院 物理與信息科學(xué)系，玉林 537000；
2. 廣西大學(xué) 物理科學(xué)與工程技術(shù)學(xué)院，南寧 530004；
3. 中國(guó)科學(xué)院 國(guó)際材料物理中心，沈陽 110016)
摘 要: 測(cè)量Zn單晶、Al單晶、鑄態(tài)Zn60Al40合金以及冷軋Zn、Al、Zn60Al40的符合正電子湮沒輻射多普勒展寬譜和壽命譜。結(jié)果表明，單晶Zn和鑄態(tài)Zn60Al40合金的商譜在約17.4×10−3 m0c處出現(xiàn)一個(gè)峰，主要是正電子與Zn中3d電子湮沒的作用；當(dāng)Zn原子和Al原子形成Zn60Al40合金時(shí)，Zn原子和Al原子間主要以金屬鍵結(jié)合；軋制Al的商譜明顯低于單晶Al的商譜，冷軋Zn60Al40合金商譜略低于鑄態(tài)Zn60Al40合金商譜；而單晶Zn和軋制Zn的商譜幾乎重疊；Al、Zn金屬和Zn60Al40合金經(jīng)冷軋后，由于樣品中產(chǎn)生了缺陷，而導(dǎo)致正電子平均壽命增加，軋制Al的增幅最大，軋制Zn60Al40合金的增幅次之，而軋制Zn的增幅最小。
關(guān)鍵字: Zn60Al40合金；3d電子；微觀缺陷；正電子湮沒
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
