TY - JOUR
T1 - Crack-induced intergranular corrosion behavior of aerial aluminum alloy subjected to severe plastic deformation
AU - Li, Jinghui
AU - Li, Fuguo
AU - Li, Jiang
AU - Liang, Shan
N1 - Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/2/1
Y1 - 2019/2/1
N2 - The influence of crack-induced on the intergranular corrosion (IGC) behavior of aerial aluminum alloy subjected to severe plastic deformation (SPD) is investigated in this work. Addressing this problem, a particular SPD technology, namely elliptical cross-sectioned spiral equal channel extrusion (ECSEE), is employed to prefabricate cracks. The microstructure, induced-crack observation and IGC behavior of the ECSEE-ed alloy are observed. ECSEE can significantly refine the grains, while lots of small and deep dimples as well as broken second-phase particles appear on fracture surface. The formation mechanism of the fracture surface is revealed based on the observation of fracture morphology. A typical stress corrosion cracking characteristic is observed in IGC tested ECSEE-ed alloy, and the corroded fracture consisted of higher volume fraction of brittle intergranular fractures that are made up of rockcandy-like brittle and intergranular fracture. The mechanism of intergranular corrosion of dehiscence and cracking is determined considering the factors such as grain refinement, grain boundary precipitations, preexisted crack, and residual stress.
AB - The influence of crack-induced on the intergranular corrosion (IGC) behavior of aerial aluminum alloy subjected to severe plastic deformation (SPD) is investigated in this work. Addressing this problem, a particular SPD technology, namely elliptical cross-sectioned spiral equal channel extrusion (ECSEE), is employed to prefabricate cracks. The microstructure, induced-crack observation and IGC behavior of the ECSEE-ed alloy are observed. ECSEE can significantly refine the grains, while lots of small and deep dimples as well as broken second-phase particles appear on fracture surface. The formation mechanism of the fracture surface is revealed based on the observation of fracture morphology. A typical stress corrosion cracking characteristic is observed in IGC tested ECSEE-ed alloy, and the corroded fracture consisted of higher volume fraction of brittle intergranular fractures that are made up of rockcandy-like brittle and intergranular fracture. The mechanism of intergranular corrosion of dehiscence and cracking is determined considering the factors such as grain refinement, grain boundary precipitations, preexisted crack, and residual stress.
KW - aluminum alloy
KW - crack
KW - grain refinement
KW - intergranular corrosion
KW - severe plastic deformation
UR - http://www.scopus.com/inward/record.url?scp=85052931355&partnerID=8YFLogxK
U2 - 10.1002/maco.201810150
DO - 10.1002/maco.201810150
M3 - 文章
AN - SCOPUS:85052931355
SN - 0947-5117
VL - 70
SP - 234
EP - 245
JO - Materials and Corrosion
JF - Materials and Corrosion
IS - 2
ER -