Abstract
Magnesium alloy Mg-4Y-3Nd (WN43) was subjected to ECAP at T∼300 °C up to 8 passes, using route BC. The initial as-extruded material with average grain size of ∼10 μm, was effectively refined down to sub-micrometer scale, reaching a grain size of ∼380 nm, after 8 passes. At the same time, secondary phase particle precipitation of β′-Mg12Nd2Y, and β-Mg14Nd2Y was induced. At 8 passes, fragmentation and coarsening of these phases occurred. Both grain refinement and β′/β precipitation strengthened the alloy. The strengthening was detected by nanoindentation hardness and accounted of up to 30% increment at 8 ECAP pass, compared to the initial extruded condition.
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