Abstract

The aim of this work was to study the effect of ball to powder weight ratio (BPR) on biodegradable binary magnesium-zinc (Mg-Zn) alloy synthesized using mechanical alloying. A powder mixture of Mg-5wt%Zn was milled in a planetary mill under argon atmosphere using a stainless steel container and balls. Milling process was carried out at 200 rpm for 5 hours using various BPR (i.e. 5:1, 10:1, 15:1, 20:1). Then, as milled powder was compacted under 400 MPa and sintered in a tube furnace at 300 °C in argon flow for an hour. The sintered density and microhardness of the alloy increased as BPR increased up to 15:1. However a further increasing showed a reduction in both density and microhardness which due to enlargement of crystallite and particle which resulted from the excessive internal energy during mechanical alloying.

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