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manufactured). The oxide particles are seen in both microstructures of Figure 4-1 (black, round particles). Also annealing twins, at the white arrows, are observed in the coarse-grained material, Fig. 4-1a, but not in the fine grained material. These grains have a special orientation relationship to the matrix material (related by a 60o rotation about the <111> crystallographic direction) and have been shown to influence mechanical properties in other materials (see for example Kumar, et. al., 2000 and Flinn, et. al, 2001). 1 micron a) b) Figure 4-1. Initial microstructures of a) coarse, elongated-grained and b) fine, equiaxed-grained MA 754. Figure 4-1b shows the fine-grained MA754 to have a grain size on the order of 0.5-1.0 m. This is in contrast to the coarse-grained MA754 which exhibited highly elongated grains on the order of millimeters in length. The grain size and morphology of the coarse, elongated grained MA 754 is not shown in Figure 4-1a due to the high magnification of this figure. Figure 4-2 shows representative micrographs of the coarse, elongated microstructure as viewed from various directions in the bar. The grains in this alloy are very large and elongated in the extrusion direction (longitudinal direction), Figs 4- 2a and 4-2b, while fairly equiaxed in the face perpendicular to the extrusion direction (transverse direction), Fig. 4-2c. The microstructure-dependent mechanical properties are, therefore, expected to vary with orientation within the coarse-grained material. The creep properties are not expected to be as good in the transverse direction as in the longitudinal direction since grain boundaries tend to enhance the creep rate. Figure 4-2 also shows apparent residual porosity, indicated by the arrows. It was determined that the chemicals used to reveal the grain boundaries (the light gray continuous lines in the photomicrographs) exaggerated the porosity and the density of the materials studied actually was greater than 99% of theoretical density. 55PDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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