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← ScienceWhich mechanical failure accelerates when thermal stress cycles persist within turbine blades?
A)Creep rupture at grain boundaries✓
B)Oxidation increasing material porosity
C)Elastic deformation exceeds yield strength
D)Resonance within shroud dampens motion
💡 Explanation
High temperature gradients cause thermal stress. Creep occurs due to **vacancy diffusion** leading to plastic deformation; because boundary thickness decreases, it accelerates to rupture. Therefore, creep rupture is the likely consequence, rather than oxidation/deformation alternatives under these conditions.
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