Amorphous structure in melt spun or ball milled alloys was studied in ZrNiTiCu system with Mn, Nb and Ag additions. TEM studies of melt spun ribbons from alloys far from eutectic composition has shown usually presence of nanocrystals while that near eutectic only amorphous structure. The introduction of even small amount of 3 at. % of Al into high copper eutectic ZrTiNiCuMn alloys resulted in formation of additional coarse dendrite like primary crystallites. They were eliminated by decreasing the Al content down to 1,5 at%, i.e. from Ti₁₅Zr₁₅Ni₂₅Cu₃₉Mn₃Al₃ to to Ti_15,5Zr₁₄Ni₂₇Cu₃₉Mn₃Al_1,5 (in at. %). The glass transition range ΔT_x ~26^oC, T_x ~482^oC and the reduced glass transition T_gr ~0,59 was determined in melt spun ribbons. The in-situ heating of thin foils within the crystallization range was applied to introduce controlled amount of nano-crystallites.

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