Zn-40Al合金中微观缺陷和3d电子的正电子湮没  

Positron annihilation of microdefects and 3d electrons in Zn-40Al alloy

作　　者：陈雪星[1] 郭秋娥[2] 韩艳玲[2] 黄宇阳[2] 邓文[2,3] 

机构地区：[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

出　　处：《中国有色金属学报》2009年第9期1575-1579,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(10764001);广西自然科学基金资助项目(桂科回0832003)

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17.4×10-3m0c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。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.

关 键 词：Zn60Al40合金 3d电子 微观缺陷 正电子湮没 

分 类 号：TG146.2[一般工业技术—材料科学与工程]