The difference is thought to be due to the effect of forces induced by drawing that act in the direction normal to the lamellae within a mat.
#Singlecrystal drawing software
The orientation behavior of crystal axes observed before necking is not always similar to that observed in the deformation of a single crystal. CrystalMaker Software Ltd: crystal and molecular structures, modelling, visualisation software plus diffraction pattern simulation for macOS and Windows. The postulate of formation of transitory two-dimensional crystals in necking seems useful in explaining the double orientation in the drawn film.
This biaxial orientation in the drawn films has a high degree of correlation with the orientation of crystal axes observed before necking, and suggests that necking takes place in such a way that the chain tilts gradually about the b axis and ultimately unfolds. The structure of films drawn from mats is characterized by a distinct double orientation of crystals. The a axis orients in the drawing direction the b axis orients perpendicular to the direction of drawing and the chain axis tilts away from the thickness direction of the mat. A change of orientation of crystal axes occurs before necking without change of lamellar orientation. This study investigates the inner quality including microdefects, orientation deviation and dendrite spacing of DD6 single-crystal superalloy with different. This behavior strongly suggests the unfolding of chains during drawing. The maximum draw ratio is approximately proportional to the thickness of the lamellae.
The drawing is accompanied by distinct necking, with a large decrease in the thickness of the mat and a very high maximum draw ratio, sometimes over 30. Drawing is possible at temperatures higher than about 90☌. Drawing of single-crystal mats of linear polyethylene has been investigated.
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