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Abstract
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The mechanisms governing the microstructural evolution during friction stir welding of Monel at different
heat inputs and the corresponding mechanical properties were investigated. In the low heat input
condition, both continuous and discontinuous dynamic recrystallizations caused the formation of fine
grains with an average grain size of 1.7 lm and closely random texture. A high heat input condition
resulted in larger average grain size of 23.5 lm with shear texture by only the continuous dynamic
recrystallization. Low heat input led to the simultaneous increase of strength and elongation. The origins
of the tensile behavior of the joints have been discussed.
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