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Effect of crack path and high angle grain boundaries on fracture toughness and fatigue behaviour of cryorolled AA2219
Author(s) -
B. Blessto,
Katakam Sivaprasad,
Veerappan Muthupandi,
M. Arumugam
Publication year - 2020
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.13320
Subject(s) - materials science , grain boundary , fracture toughness , composite material , paris' law , alloy , toughness , fracture mechanics , ultimate tensile strength , crack growth resistance curve , plane stress , metallurgy , crack closure , microstructure , structural engineering , finite element method , engineering
AA2219 aerospace alloys in T87 condition were rolled at room temperature and subzero temperature, followed by analysis on its tensile, fracture toughness and fatigue crack growth characteristics. The cryorolled alloy exhibits lower plane stress fracture toughness (50 kJ m −2 ) than T87 condition (99 kJ m −2 ) because of higher high angle grain boundaries (HAGBs) which causes an inability to withstand the cyclic deformation. Nevertheless, the cryorolled alloy has shown higher tensile properties and crack growth resistance due to finer grains and large plastic zone size in the crack tip. The unidirectional rolled samples undergo a distinctive zigzag path than the cross‐directional rolled alloy because of deflection from the orderly oriented second phase particles.