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中南大学学报(自然科学版)

Journal of Central South University

第24卷    第4期    总第92期    1993年8月

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文章编号:(1993)04-525-6
少量Bi对2091 Al-Li合金拉伸性能和断裂行为的影响
郑子樵; 刘明桂; 刘学志; 尹登峰

(中南工业大学材料科学与工程系;长沙; 410083)

摘 要: 本文研究了添加少量Bi对2091 Al-Li合金室温拉伸性能和断裂行为的影响,用俄歇电子能谱分析了杂质Na在晶界和晶内的分布情况。实验结果表明,在Na含量较高时,Na在晶界严重偏析,降低合金的强度和塑性。添加少量Bi能消除Na在晶界的偏析,强化晶界,减少低能沿晶断裂倾向,并能在一定程度上细化S′相和增加其析出密度,提高合金的强度和塑性。

 

关键字: Al—Li合金; 拉伸性能; 断裂; 铋

THE INFLUENCE OF THE SMALL ADDITION OF BISMUTH ON THE TENSILE PROPERTIES AND FRACTURE BEHAVIOUR OF 2091 Al-Li ALLOY
Zheng Ziqiao; Liu Minggui; Liu Xuezhi; Yin Denfeng

Departement of Materials Science and Engineering; Central South University of Technology; Changsha; 410083; China

Abstract:The influence of the small addition of bismuth on the tensile properties and fracture behaviour of 2091 Ai-Li alloy has been investigated. The distribution of impurity sodium on the grain boundaries andwithin the matrix was determined by Auger electron energy spectrum. The results showed that there was the severe grain boundary segregation of sodium in the Al-Li alloy with higher sodium content, which resulted in the decrease of the strength and ductility of Al-Li alloy. The small addition of bismuth can eliminate the grain boundary segregation of sodium, strengthen the grain boundaries and reduce the tendency of low energy intergranular fracture. Bisides, a small addition of bismuth has the role of refining S' phaseand increasing the density of S' precipitates. Therefore, the Bi-containing 2091 Al-Li alloy provides ahigher combination of the strength and ductility.

 

Key words: Al-Li alloy; tensile properties; fracture; bismuth

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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