Microtensile testing of a free-standing Pt-aluminide bond coat

Effect of Cyclic Oxidation Exposure on Tensile Properties of a Pt-Aluminide Bond-Coated Ni-Base Superalloy

“…The design of the specimen was based on a two-dimensional linear elastic finite element simulation, reported elsewhere. [34] For preparation of the specimens, strips of 0.5-mm thickness were first sliced from CM-247LC rods by wire-cut electodischarge machining (EDM). The PtAl coating was then applied on these strips in the manner mentioned previously.…”

“…[4,[23][24][25] In the present article, the effect of cyclic oxidation exposure [in air at 1373 K (1100°C)] on the tensile properties of DS Ni-base superalloy CM-247LC was examined in the PtAl bond coated condition. To achieve this, tensile testing of both bulk-coated samples and free-standing coating samples [33,34] was carried out. The tensile behavior of the coated alloy was correlated with the microstructural changes that occurred in the coating and the substrate during oxidation exposure.…”

Effect of Strain Rate on Ductile-to-Brittle Transition Temperature of a Free-Standing Pt-Aluminide Bond Coat

“…The dimensions of the microsamples were established by a finite element method-based study. [10,11] The gage length (GL), gage width (GW), and fillet radius (R) of the cutout samples were 2, 0.5, and 0.5 mm, respectively, while their overall length was 8 mm, as shown in Figure 1(a). A holding length (HL) of 1 mm was provided in order to arrest the sample within slotted grips during testing.…”

“…A holding length (HL) of 1 mm was provided in order to arrest the sample within slotted grips during testing. [7,10,11] The free-standing coating samples were prepared by precision polishing of the cut-out samples from one side until the substrate was completely removed and the sample thickness became equal to the thickness of bond coat, which was approximately 100 lm (Figures 1(a) and (b)). The flatness of the surface and uniformity in thickness reduction during polishing were ensured by the use of a Tripod Polisher.…”

“…Resistance heating of the specimens by means of impressed current was adopted for carrying out the high-temperature tests. [11,12] The temperature in the specimen gage length was monitored using a two-color ratio infrared radiation pyrometer to an accuracy of ±5°C. A video extensometer, having a resolution of 10 l-strain, was used for measuring the strain in the specimen during testing.…”