Coarsening of beta' precipitates in an isothermally-aged Fe75-Ni10-Al15 alloy (Englisch)

in Materials Transactions ; 51 , 3 ; 442-446
Materials Transactions
; 2010
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The coarsening process of the beta' precipitates was studied in tin isothermally aged Fe75-Ni10-Al15 alloy. The aging treatments at 750, 850, and 920 degr C caused the precipitation of the beta' phase with the B2 type crystalline structure in a bee ferritic matrix phase. As the aging progressed, the initial rounded shape changed to cuboids aligned in the (100) directions of the ferritic matrix, and finally to rectangular plates also aligned in the same direction. The coarsening process of the beta' phase was faster as the aging temperature increased. Nevertheless, the highest hardness and slowest overaging process took place during the aging at 920 degr C. This increase in hardness seems to be associated with the more rapid formation of the cuboid precipitates aligned in the (100) direction of the ferritic matrix.

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ANNOUNCEMENT
| 2010

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