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

Qingqing Sun; Qingyou Han; Shuai Wang; Rong Xu

doi:10.1016/j.surfcoat.2020.126127

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

Qingqing Sun
, Qingyou Han
, Shuai Wang
, Rong Xu

Southern University of Science and Technology
Purdue University

Research output: Contribution to journal › Article › peer-review

59 Scopus citations

Abstract

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.

Original language	English
Article number	126127
Journal	Surface and Coatings Technology
Volume	398
DOIs	https://doi.org/10.1016/j.surfcoat.2020.126127
State	Published - 25 Sep 2020
Externally published	Yes

Keywords

AA 7150
Exfoliation corrosion
Post ageing
Surface nanocrystallization
Surface softening

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10.1016/j.surfcoat.2020.126127

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

abstract = "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.",

keywords = "AA 7150, Exfoliation corrosion, Post ageing, Surface nanocrystallization, Surface softening",

author = "Qingqing Sun and Qingyou Han and Shuai Wang and Rong Xu",

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year = "2020",

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doi = "10.1016/j.surfcoat.2020.126127",

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TY - JOUR

T1 - Microstructure, corrosion behaviour and thermal stability of AA 7150 after ultrasonic shot peening

AU - Sun, Qingqing

AU - Han, Qingyou

AU - Wang, Shuai

AU - Xu, Rong

PY - 2020/9/25

Y1 - 2020/9/25

N2 - 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.

AB - 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.

KW - AA 7150

KW - Exfoliation corrosion

KW - Post ageing

KW - Surface nanocrystallization

KW - Surface softening

UR - https://www.scopus.com/pages/publications/85087104326

U2 - 10.1016/j.surfcoat.2020.126127

DO - 10.1016/j.surfcoat.2020.126127

M3 - 文章

AN - SCOPUS:85087104326

SN - 0257-8972

VL - 398

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

M1 - 126127

ER -

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

Abstract

Keywords

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