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The high temperature hardness behaviour of U–15%Pu and T91 cladding was studied with the help of a hot hardness tester. The hardness versus temperature plot for the T91 alloy consists of two straight lines with different slopes intersecting at 778K. The hot hardness data of orthorhombic α phase of U–15%Pu showed a transition at around 408K. The appearance of the tetragonal β-phase showed a sudden...