新型AA2037连铸轧铝合金高温沉淀相的正电子湮没研究  

Positron Annihilation Study of the Precipitation of a Continuous Cast AA2037 Al Alloy at High Temperature Annealing

作　　者：程俊[1] 曾强 吴奕初[1] 何春清[1] 翟同广 

机构地区：[1]武汉大学物理科学与技术学院,湖北武汉430072 [2]Chemical and Materials Engineering Depart ment,University of Kentucky

出　　处：《武汉大学学报（理学版）》2009年第6期661-664,共4页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金资助项目(10975110);西北工业大学凝固技术国家重点实验室开放课题(SKLSP201004)

摘　　要：采用正电子湮没寿命谱和符合多普勒展宽谱方法对AA2037连铸轧铝合金热轧板和70%冷轧板高温(约470℃)退火的沉淀相进行了研究.结果表明,正电子平均寿命随退火时间延长而减小.其原因是由于热轧或冷轧形变导致的空位、位错等缺陷的回复和再结晶;另一方面由于随退火时间延长沉淀相不断析出,符合多普勒展宽曲线出现明显的铜元素、锰元素的特征,并且沉淀相越多,信号越明显.这证实了沉淀相(T相)中存在铜元素和锰元素.Hot bands of a continuous cast aluminum alloy （AA2037） with and without 70% cold roll ing deformation were annealed at high temperatures （470℃）. The recrystallization microstructure and precipitation in the samples after annealing were investigated by positron lifetime and coincidence Doppler broadening techniques. The experimental results showed that positron mean lifetime decreased with in- creasing annealing time due to the formation of the precipitations （T phase） and recovery of defects induced by hot-rolling and/or 70% cold-rolling. Furthermore, coincidence Doppler broadening （CDB） ratio curve observed that characteristic shape peak of Mn and Cu increased with annealing time, i.e. the content of the T phase, which identified that there exist Mn and Cu elements in T phase.

关 键 词：正电子湮没 铝合金 沉淀相 退火 冷轧 

分 类 号：TQ426.61[化学工程]