Ni-Co-Cr高温合金中3d电子及键结构的正电子湮没研究  

Study on 3d-Shell Electrons and Bond Configuration in Ni-Co-Cr Superalloys by Positron Annihilation Spectroscopy

作　　者：胡益丰[1] 郝文博 邓文[3] 

机构地区：[1]江苏技术师范学院,江苏常州213001 [2]爱思帝上海驱动系统有限公司,上海201400 [3]广西大学,广西南宁530004

出　　处：《稀有金属材料与工程》2010年第7期1171-1174,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(50361002);江苏省普通高校自然科学研究计划资助项目(07KJD430041);江苏技术师范学院青年科研基金项目(KYY06094)资助

摘　　要：利用双探头符合系统,测量纯金属Ni、Co、Cr以及3种不同成分的Ni-Co-Cr合金的正电子湮没辐射Doppler展宽谱,分析形成Ni-Co-Cr合金时3d电子的作用。结果表明,3种纯金属中Ni的3d电子信号较强,当增加Ni-Co-Cr合金中的Ni原子的比例时,导致正电子与自由电子湮没的几率增加。不同成分Ni-Co-Cr合金的实验商谱与其合成商谱保持了较好的一致性,这显示出在Ni-Co-Cr合金中不同原子之间主要以金属键相结合,这可能是Ni-Co-Cr合金具有较好金属延展性的原因之一。Doppler-broadening spectra of positron annihilation radiation for pure metals Ni,Co and Cr and Ni-Co-Cr alloys with three different chemical compositions were measured by 2-detector coincidence technique. And the effect of the 3d electrons on Ni-Co-Cr alloy formation was analyzed. The results show that the 3d electron signal for the metal Ni is relatively higher among the three pure metals. The increase of Ni atom proportion in Ni-Co-Cr alloys leads to an increase in the probability of positron annihilation with free electrons. The experimental ratio curves for three Ni-Co-Cr alloys are greatly similar to the corresponding theoretic ratio curves,which indicate that the bonding nature in Ni-Co-Cr alloys is mainly metallic. This can explain why the Ni-Co-Cr alloys have good metal ductility.

关 键 词：Ni-Co-Cr高温合金 Doppler展宽谱 3d电子 键结构 

分 类 号：TG132.32[一般工业技术—材料科学与工程]