Formation of Quasicrystals and Crystallization Sequence in the Zr_46.8Ti_8.2Cu_7.5Ni₁₀Be_27.5 Bulk Glass

Decomposition and crystallization of Pd40Cu30Ni10P20 and Zr46.8Ti8.2Cu7.5Ni10Be27.5 metallic glasses

“…Even after 10 h annealing, when first indications of a second crystalline phase appeared in the XRD diagram, the microstructure was still dominated by a significant volume fraction of quasicrystals embedded in the amorphous matrix. In this material numerous bright spots were observed by SEM in backscattered electron images which were attributed to a decomposition, correlated with the precipitation of the quasicrystals [12]. From the bright contrast of the spots it was concluded that these small regions of up to 200 nm width are rich of elements with high Z (e.g.…”

Timescales of crystallization and viscous flow of the bulk glass-forming Zr-Ti-Ni-Cu-Be alloys

“…It has been postulated that this metastable phase eventually transforms to one or more new phases after a sufficient amount of annealing time at a given temperature. 17,20 After the primary crystallization, a second crystallization process produces the remainder of the peaks observed in XRD. Whereas at low temperatures the phases that appear after the formation of the quasicrystals seem to vary somewhat between the alloys, at high temperatures all the alloys appear to crystallize very rapidly, forming a similar distribution of phases.…”

Crystallization behavior of low temperature pre-annealed Zr46.8Ti8.2Ni10Cu7.5Be27.5—bulk glass

“…modified Be 2 Zr and Zr 2 Cu [8,10] consisting of a composition far away from that of the multicomponent alloy. Depending on the thermal history, the crystallization of ZrTiCuNiBe glasses follows different pathways, which end up in different crystalline microstructures [8,12]. Recently, the formation of icosahedral quasicrystals in the glass V4 at temperatures above the glass transition was reported, which was correlated to the decomposition of the glass [11,12].…”

“…The stability is linked to the nature and nucleation kinetics of the crystalline phases which form during heat treatment of the glass. Several studies about the crystallization of Zr-Ti-Cu-Ni-Be alloys have been performed during the last few years [2][3][4][5][6][7][8][9][10][11][12]: the equilibrium phases have been identified [8][9][10] and the decomposition and crystallization behavior of ZrTiCuNiBe glasses have been investigated [2][3][4][5][6][7][8][9][10][11][12]. A general feature of ZrTiCuNiBe glasses is their strong tendency for decomposition.…”