FIELD: alloys. SUBSTANCE: alloy has, wt.-% magnesium 3-5; manganese 0.02-0.07; beryllium 0.0003-0.004; chrome 0.005-0.07; titanium 0.005-0.07; zirconium 0.02-0.07; vanadium 0.02-0.07, and aluminium the rest. Aluminium-base alloy has additionally 0.25-0.6 wt.-% zinc. Proposed alloy provides preparing practically defectless surface of the rigid magnetic disk base with minimal roughness (micrograin size is 20-25 mcm) and uniform distribution of dispersed particles of intermetallides at maximal size of the latter 3-4 mcm, not more. EFFECT: enhanced quality of alloy. 2 cl, 3 tbl
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