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By Golam M. Newaz

Advances in Thermoplastic Matrix Composite fabrics (Astm targeted Technical Publication// Stp) by way of Golam M. Newaz (Editor)

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Extra resources for Advances in Thermoplastic Matrix Composite Materials (Astm Special Technical Publication Stp)

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In the majority of cases there is some part of the α ' - y interface that has nearly a definite crystallographic orientation. As previously mentioned, this plane is called the habit plane and is of special significance in the crystal­ lography of martensite. The habit plane is usually expressed as a plane in the parent phase. -y interface is not planar, so that a definite plane cannot be assigned. But even in this case the midrib has a definite plane, which is usually taken as the habit plane. Taking such a plane, in the case of the u m k l a p p transformation in iron alloys the habit plane is approximately (259) y or (3 1 0 1 5 ) r t T h o u g h the habit plane is definite, a fairly large a m o u n t of scatter usually exists.

Some i n v e s t i g a t o r s believe that the midrib is a thin crystal plate but this is a matter for specu­ lation. It may, therefore, be considered at present that the midrib may be the region in which some lattice imperfections are retained. 9 Relation of substructures to magnetic domains The magnetic domains in ferromagnetic materials must be influenced by the fine structure of the crystals. 0 μτη but the long direction of the magnetic domain coincides with the [001] of an a' crystal, as is predicted from magnetostriction.

In Fig. 36c, the ε plates are parallel to three of the four {11 l } y planes, and are thicker, exhibiting notches at the ends. This sequence suggests that thickening occurs by the successive formation of thin ε plates in contact with their neighbors; ε plates do not thicken by growth in the lateral direction. Β. 83% M n steel air-cooled from 1000°C. In a steel of this composition it is possible to display the y ε α' transformation process. The etchant used in Fig. 37 is the same as in Fig. 36. The bright regions are ε plates (thin ε plates look black, probably due to etching of their boundaries), the grey regions are austenite retained between the ε plates, and the darkest, granular regions are a' martensite.

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