Effect of misfit strains on the core-shell structures of the precipitates in Al-Sc-Er alloys
The effect of the elastic strain energy on the core-shell structures was studied in an Al-0.06 Sc-0.02 Er (at.%) alloy.A theoretical model for the calculation of the elastic strain energy caused by core-shell precipitates,which is applicable to materials with weak elastic anisotropy,is adopted.It is demonstrated that the partitioning of Er to the precipitate core does not reduce the elastic strain energy as expected in the previous study.However,the resistance due to the elastic strain energy to form an Al3(Sc0.36Er0.64)-Al3(Sc0.8Er0.2) core-shell precipitate is quite small,and can be easily overcome by the decrease of the total interfacial energy,which is consistent with the previous experimental results.On the other hand,the resistance due to the elastic strain energy to form an Al3Er-Al3Sc core-shell precipitate is much larger than that to form an Al3(Sc0.36Er0.64) -Al3(Sc0.8Er0.2) core-shell precipitate,thus the partitioning of all the Er atoms to the core is strongly hindered by the elastic strain energy and was not observed in the experiment of the previous study.
Aluminum alloys Precipitation Core-shell structure Elastic strain energy Rare earths
陈思成 李长荣 杜振民 郭翠萍 张军利
北京科技大学 材料科学与工程学院
国内会议
常州
英文
113-116
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）