摘要
采用原子探针层析技术(APT)等测试手段分析了LT24铝合金热轧后合金元素的偏聚规律。结果表明:热轧态铝合金晶粒内部有成分为Al0.5Mg(Si0.7Cu0.3)的析出相,析出相与基体之间的界面处没有元素偏聚。溶质原子Mg、Si、Cu在晶界处偏聚,在晶界处的偏聚规律与晶粒内部的相反,Cu的偏聚倾向远大于Si和Mg,晶界处Cu的含量达到基体Cu含量的45倍左右。基于实验结果,讨论了合金元素偏聚的规律及其对材料性能的影响。
The segregation of solute atoms in hot rolled LT24 aluminum alloy was investigated by atom probe tomography. The results show that a precipitate with composition of Al0.5Mg(Si0.7Cu0.3) can be observed in the grains. No solute segregation can be observed at the interface between precipitates and the matrix. However solute atoms, such as Mg, Si and Cu all tend to segregate at grain boundaries, but the segregation tendency of Cu is much stronger than that of Mg and Si. The concentration of Cu at grain boundaries is 45 times of that at the matrix. Based on the experimental results, the feature of solute segregation and its effect on the performance of the alloy are discussed.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2014年第12期919-924,共6页
Chinese Journal of Materials Research
基金
国家自然科学基金51301103
中国博士后科学基金2013M541507
上海市科学技术委员会重点项目12JC1404000
上海大学创新基金资助项目~~
关键词
金属材料
铝合金
偏聚
析出
晶界
原子探针层析技术
metallic materials,aluminum alloy,segregation,precipitates,grain boundary,atom probe tomography
