On the mechanism of fatigue crack initiation in high-angle grain boundaries

2022 ◽  
pp. 106721
Author(s):  
Veronika Mazánová ◽  
Milan Heczko ◽  
Jaroslav Polák
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Grain Boundaries ◽  
Fatigue Crack Initiation ◽  
High Angle

Prediction of corrosion fatigue crack initiation behavior of A7N01P-T4 aluminum alloy welded joints

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744034 ◽  
Author(s):  
J. An ◽  
J. Chen ◽  
G. Gou ◽  
H. Chen ◽  
W. Wang
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Crack Initiation ◽  
Grain Boundaries ◽  
Corrosion Fatigue ◽  
Welded Joints ◽  
Fatigue Cracks ◽  
Fatigue Crack Initiation ◽  
Corrosion Fatigue Crack ◽  
Second Phases

Through investigating the corrosion fatigue crack initiation behavior of A7N01P-T4 aluminum alloy welded joints in 3.5 wt.% NaCl solution, corrosion fatigue crack initiation life is formulated as [Formula: see text] and the mechanism of corrosion fatigue crack initiation is proposed. SEM and TEM tests revealed that several corrosion fatigue cracks formed asynchronously and the first crack does not necessarily develop into the leading crack. The uneven reticular dislocations produced by fatigue loading are prone to piling up and tangling near the grain boundaries or the second phases and form the “high dislocation-density region” (HDDR), which acts as an anode in microbatteries and dissolved to form small crack. Thus the etching pits, HDDR near the grain boundaries and second phases are confirmed as the main causes inducing the initiation of fatigue crack.

Ex and in situ investigations on the role of persistent slip bands and grain boundaries in fatigue crack initiation

2017 ◽  
Vol 32 (23) ◽  
pp. 4276-4286 ◽  
Author(s):  
Heinz Werner Höppel ◽  
Philip Goik ◽  
Christian Krechel ◽  
Mathias Göken
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Grain Boundaries ◽  
Fatigue Crack Initiation ◽  
Slip Bands ◽  
Persistent Slip Bands ◽  
Image Position

Abstract

Grain boundaries, stress gradients and fatigue crack initiation

1976 ◽  
Vol 10 (12) ◽  
pp. 1115-1118 ◽  
Author(s):  
Harold Margolin ◽  
Yashwant Mahajan ◽  
Yousef Saleh
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Grain Boundaries ◽  
Fatigue Crack Initiation ◽  
Stress Gradients
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