Quantitative study of dimensional stability mechanism and microstructure evolution during precipitation process of 2024Al alloy  

作　　者：Youfang Cao Longtao Jiang Deng Gong Guoqin Chen Ziyang Xiu Yangming Cheng Xiufang Wang Gaohui Wua 

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China [2]State Key Laboratory of Advanced Welding Production Technology,Harbin Institute of Technology,Harbin 150001,China [3]Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China

出　　处：《Journal of Materials Science & Technology》2021年第31期85-94,共10页材料科学技术（英文版）

基　　金：sponsored by the National Natural Science Foundation of China with grant No.U1637201。

摘　　要：In this paper,we were devoted to quantitatively analyzing the dimensional change of 2024 Al alloy during the aging process.Types of precipitates have been defined and the corresponding volume fraction has been measured with Transmission Electron Microscopy(TEM)and Three-Dimensional Atom Probe Tomography(3 D-APT).Guinier-Preston-Bagaryatsky(GPB)zone(0.86 vol.%)was found after aging for 8 h.GPB zone(0.17 vol.%)and S'phase(1.02 vol.%)was found after aging for 24 h.The reduced dimensional change was attributed to the reduction of matrix lattice parameter.Relative to the initial supersaturated solid solution state,the lattice strain of-2.79×10^(-5)and-5.16×10^(-5)was produced after 8 h and 24 h aging respectively.The difference of the lattice parameters between the precipitates and matrix was also considered.A model was established to quantitatively describe the relationship between the precipitation process and dimensional change of 2024 Al alloy.

关 键 词：Aluminum alloy AGING Atom probe tomography(APT) Dimensional stability PRECIPITATE 

分 类 号：TG146.21[一般工业技术—材料科学与工程]