MATEC Web of Conferences
Volume 12, 2014FDMD II - JIP 2014 - Fatigue Design & Material Defects
|Number of page(s)||2|
|Section||Session 7: Fatigue Crack Growth and Thresholds at Defects I|
|Published online||09 June 2014|
Influence of intermetallic particles on short fatigue crack initiation in AA2050-T8 and AA7050-T7451
1 INSA Lyon, MATEIS, 25 av. Jean Capelle, 69621 Villeurbanne cedex, France
2 Mines Paris Tech, Centre des Materiaux, BP 87, 91003 Evry, France
3 Constellium CRV, 725 rue Aristide Bergès, CRV CS 10027, 38341 Voreppe, France
a Corresponding author: firstname.lastname@example.org
Fatigue crack initiation at particles is studied in hot rolled 2050-T8 and 7050-T7451 material, using 1 to 4 mm cross section specimens. Both size and aspect ratio of particles are observed to affect their probability of being damaged. In 2050-T8 material, the probability that a matrix crack initiate at a cracked particle increases with its size, and no effect of aspect ratio is observed. In 2050-T8 specimens, matrix cracks initiate at both precracked (Al, Cu, Fe, Mn) particles and particles cracked during cycling. Initiation in 7050-T74 specimens occur on Mg2Si particles which may be cracked or debonded, and Al7Cu2Fe particles that are cracked during cyclic loading.
© Owned by the authors, published by EDP Sciences, 2014
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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