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: email@example.com
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.
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