Surface segregation phenomenon of surface severe plastic deformed Al-Zn-Mg-Cu alloys

Sun, Qingqing1,2; Han, Qingyou1

2020-06

10.1016/j.mtla.2020.100741

Materialia   影响因子和分区

2589-1529

Surface severe plastic deformation ((SPD)-P-2) is a well-known technique that can result in surface nanocrystallization for structural alloys. In current work, a (SPD)-P-2 induced segregation phenomenon near metal surface and its effect on open circuit potential were studied for Al-Zn-Mg-Cu alloys. E.g., for AA 7150, the thickness of segregation reaches up to 13 mu m after (SPD)-P-2 and 1 year natural aging, both Zn and Cu contents in topmost layer increase by more than two folds. Thermodynamics analysis and diffusion kinetics are presented. It is demonstrated that surface segregation is a result of solute atoms diffusing from sub-surface to surface layer along "short circuit" paths, i.e., high density of dislocation pipes and grain boundaries created by (SPD)-P-2.

Surface segregation Al-Zn-Mg-Cu alloy Surface severe plastic deformation

ESCI ; EI

英语

通讯

Materials Science

Materials Science, Multidisciplinary

WOS:000541718400034

ELSEVIER SCI LTD

20202308789189

Plastic deformation ; Segregation (metallography) ; Grain boundaries ; Copper alloys ; Thermodynamics

Metallography:531.2 ; Copper Alloys:544.2 ; Thermodynamics:641.1 ; Atomic and Molecular Physics:931.3

Web of Science

1.Purdue Univ, Sch Engn Technol, W Lafayette, IN 47907 USA
2.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Guangdong, Peoples R China

Sun, Qingqing,Han, Qingyou. Surface segregation phenomenon of surface severe plastic deformed Al-Zn-Mg-Cu alloys[J]. Materialia,2020,11.

Sun, Qingqing,&Han, Qingyou.(2020).Surface segregation phenomenon of surface severe plastic deformed Al-Zn-Mg-Cu alloys.Materialia,11.

Sun, Qingqing,et al."Surface segregation phenomenon of surface severe plastic deformed Al-Zn-Mg-Cu alloys".Materialia 11(2020).