Microstructure, corrosion behaviour and thermal stability of AA 7150 after ultrasonic shot peening

Sun，Qingqing1,2; Han，Qingyou2; Wang，Shuai1; Xu，Rong3

2020-09-25

10.1016/j.surfcoat.2020.126127

SURFACE & COATINGS TECHNOLOGY   影响因子和分区

0257-8972

Microstructure, corrosion behaviour and thermal stability of ultrasonic shot peened AA7150 were studied in this work. After ultrasonic shot peening, exfoliation susceptibility decreases, intergranular corrosion is inhibited for both normal and transverse planes, pitting potential shifts to the positive direction. The enhanced localized corrosion resistance is attributed to the formation of equiaxed nano-grains on surface layer. Pre-existing ageing-induced η′ and η precipitates dissolved immediately after shot peening, however, after 18 months' natural ageing, nanograined precipitates with more coarsened size than pre-existing ones, re-precipitate on the peened surface layer and leads to surface softening.

AA 7150 Exfoliation corrosion Post ageing Surface nanocrystallization Surface softening

SCI ; EI

英语

第一 ; 通讯

China Postdoctoral Science Foundation[223278] ; Education Department of Guangdong Province[2018KQNCX227]

Materials Science ; Physics

Materials Science, Coatings & Films ; Physics, Applied

WOS:000549325000034

ELSEVIER SCIENCE SA

20202708889354

Localized corrosion ; Textures ; Corrosive effects ; Intergranular corrosion ; Corrosion resistance ; Shot peening

Metals Corrosion and Protection; Metal Plating:539 ; Metals Corrosion:539.1 ; Thermodynamics:641.1

MATERIALS SCIENCE

2-s2.0-85087104326

Scopus

1.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.School of Engineering Technology,Purdue University,West Lafayette,47907,United States
3.School of Mechanical Engineering,Purdue University,West Lafayette,47907,United States

Sun，Qingqing,Han，Qingyou,Wang，Shuai,et al. Microstructure, corrosion behaviour and thermal stability of AA 7150 after ultrasonic shot peening[J]. SURFACE & COATINGS TECHNOLOGY,2020,398.

Sun，Qingqing,Han，Qingyou,Wang，Shuai,&Xu，Rong.(2020).Microstructure, corrosion behaviour and thermal stability of AA 7150 after ultrasonic shot peening.SURFACE & COATINGS TECHNOLOGY,398.

Sun，Qingqing,et al."Microstructure, corrosion behaviour and thermal stability of AA 7150 after ultrasonic shot peening".SURFACE & COATINGS TECHNOLOGY 398(2020).