Influence of the processing route on the mechanical properties at high temperatures of Mg-Ni-Y-RE alloys containing LPSO-phases

Sergio Gonzalez Sanchez, Pablo Pérez, Gerardo Garcés, Paloma Adeva

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)
6 Downloads (Pure)

Abstract

The mechanical properties at high temperatures of two Mg-Ni-Y-RE alloys prepared by conventional or powder metallurgy routes have been evaluated. All alloys exhibit high-strength up to 250°C but their strength depends more on the composition of the alloy rather than on the processing route. High strength of the alloys arises from their fine grain size but there is an additional contribution of load transfer from the magnesium matrix towards the second phases in the alloys processed by the conventional route while additional hardening in the alloys prepared by powder metallurgy is due to Orowan mechanism. Above 250°C, the strength drops to very low values but all alloys exhibit high elongations and grain boundary sliding is the controlling mechanism. Grain boundary sliding also induces cracking of the coarse second phases into smaller pieces during the initial stages of plastic deformation of conventionally processed alloys.
Original languageEnglish
Pages (from-to)266-279
JournalMaterials Science and Engineering: A
Volume673
Early online date21 Jul 2016
DOIs
Publication statusPublished - 15 Sep 2016

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