Development of High Strength Alloys in the Mg-Ni-Y-RE System

Abstract:

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The microstructural and mechanical characterization of two alloys within the Mg-Ni-YRE system prepared by casting and subsequent hot extrusion at 400°C have been carried out. The microstructure of both materials consists of a fine-grained magnesium matrix embedding a high volume fraction of second phases; coarse Mg12RE and long period ordered stacking structure (LPS phase) and fine Mg2Ni particles. Both alloys show high strength values up to 250°C. The yield stress values at room temperature are 295 and 405 MPa for low- and high-alloyed magnesium alloy, respectively. Load transfer from the magnesium matrix to coarse Mg12RE and LPS particles account for the high strength of both alloys at temperatures below 250°C. Above this temperature both alloys exhibit a superplastic behaviour at low stresses with elongations of 700 and 450 % for the low and high-alloyed magnesium alloy, respectively.

Info:

Periodical:

Materials Science Forum (Volumes 567-568)

Edited by:

Pavel Šandera

Pages:

385-388

DOI:

10.4028/www.scientific.net/MSF.567-568.385

Citation:

P. Pérez et al., "Development of High Strength Alloys in the Mg-Ni-Y-RE System", Materials Science Forum, Vols. 567-568, pp. 385-388, 2008

Online since:

December 2007

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Price:

$38.00

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