Deformation of a gamma/gamma WASPALOY after laser shock

C. Bourda; Thierry T. Puig; B. Decamps; M. Condat

doi:10.1117/12.46892

1 October 1991 Deformation of a gamma/gamma' WASPALOY after laser shock

C. Bourda, Thierry T. Puig, B. Decamps, M. Condat

Proceedings Volume 1502, Industrial and Scientific Uses of High-Power Lasers; (1991) https://doi.org/10.1117/12.46892
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands

Abstract

Nickel-base superalloys have important applications in industry (i.e., aeronautic and nuclear), so deformation mechanisms of these superalloys have been extensively studied. Most of the results are coming from typical experiments at low-strain rates of deformation. Laser shock hardening provides a high amount of deformation. The purpose of the present study is to compare a high-rate deformed WASPALOY to what is known about deformation mechanisms of this alloy and some other nickel-base superalloys. Oriented single crystals of a nickel-base superalloy, strongly hardened by (gamma) phase, were exposed along the [001] axis to a laser shock (1.06 micrometers , 60 J, 25 ns, confined plasma configuration) at power densities of 3 and 9.5 X 109 W/cm2. Then, thin foils taken at depths of 50 and 700 micrometers below the impacted surface of the specimens were observed by T.E.M. All following observations have been made in areas submitted to plastic deformation. At the surface, deformation bands with planar walls (small size approximately equals 350 nm +/- 100 nm) and pairs of a /2 [110] dislocation have been observed. At the depth of 700 micrometers , deformation bands disappear, but pairs of a /2 < 100 > dislocation remain. In both cases, superlattice stacking faults have been brought into evidence and the deformation is inhomogeneous.

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C. Bourda, Thierry T. Puig, B. Decamps, and M. Condat "Deformation of a gamma/gamma' WASPALOY after laser shock", Proc. SPIE 1502, Industrial and Scientific Uses of High-Power Lasers, (1 October 1991); https://doi.org/10.1117/12.46892

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KEYWORDS

Surface finishing

Transmission electron microscopy

Plasma

Crystals

Photomicroscopy

Superlattices

Nickel

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