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The mechanism of creep in gamma prime precipitation-hardened nickel-base alloys at intermediate temperatures

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Abstract

The creep deformation of Mar-M200 single crystals of various orientations has been studied at a temperature of 1400°F. It was found by a combination of transmission microscopy and analysis of lattice rotations that shear of the γ−γ′ structure occurs by the glide of loosely coupled intrinsic/extrinsic fault pairs with a net Burgers vector ofa <112>. The orientation dependencies of both the rate and extent of primary creep are correlated with the Schmid factors and multiplicity of slip for {111}<112> systems. It is also shown that strain hardening due to intersecting slip is necessary to obtain the transition from primary to steady-state creep. In addition, it was found that the deformation mode is a function of strain rate at 1400°F. In contrast to the observed glide mechanism during creep, tensile deformation occurs by the shear of the γ and γ′ phases bya/2 <110> superlattice pairs.

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Authors and Affiliations

  1. Advanced Materials Research and Development Laboratory, Pratt & Whitney Aircraft, Middletown, Conn.

    Gerald R. Leverant (Senior Research Associate) & Bernard H. Kear (Metallurgist)

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  1. Gerald R. Leverant
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  2. Bernard H. Kear
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Leverant, G.R., Kear, B.H. The mechanism of creep in gamma prime precipitation-hardened nickel-base alloys at intermediate temperatures. Metall Trans 1, 491–498 (1970). https://doi.org/10.1007/BF02811560

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