Steel an titanium /seem/ to have a fatigue limit.
Aluminium is fcc and has low melting temperature. Disloscations tend to
move easily. Formation of fatigue cracks in metals is due to localized
There are mechanisms in Ti and steel that prevent dislocation movement at
very low stresses, which don't operate in most metals (e.g., Cotrell
atmosphere). You will also not that there is a "yield point phenomenon" in
most materials that exhibit fatigue limits, and less well-defined yield
stress in materials that do not exhibit a fatigue limit.
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