The other is that they grow from the grain boundary α layer as a result of an instability in the α/β boundary. In this case, the “side plates” have the same crystallographic orientation as the grain boundary α layer.
The other is that theygrow from the grain boundary α layer as a result of an instability in the α/βboundary. In this case, the “side plates” have the same crystallographic orientationas the grain boundary α layer.