Abstract
Feathery crystals formed in Al-5 mass%Mg alloys unidirectionally solidified were microscopically observed at intervals of about ten micronmeters for examining multiplication of twin boundaries. Two types of site for multiplication of feathery crystals are found. Type I is that a new twin boundary originates at a site separating from preexisting twin boundaries. And type II is that a new twin crystal originates at a site on the subgrain boundary generated in either individual of a preexisting twin crystal. These types of twin multiplication have particular features of the variations of length and spacing of twin boundaries.
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