[en] By means of electron irradiation the amorphous state can be produced in quasicrystalline Al-16 at% V. The transitions between the quasicrystalline, crystalline, and amorphous phases are studied in situ in a high-voltage electron microscope. Analysis of the diffraction patterns of the amorphous and the quasicrystalline state reveals that both states are characterized by the occurence of virtually the same basic density wave vectors. In contrast to the case of Al-14 at% Mn, for which a similar study was published earlier, the quasicrystalline-amorphous transition is not completely reversible. (author)