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Materials 2019, 12(6), 872;

Strain Rate during Creep in High-Pressure Die-Cast AZ91 Magnesium Alloys at Intermediate Temperatures

Escuela Politécnica Superior, University of Burgos, 09006 Burgos, Spain
Author to whom correspondence should be addressed.
Received: 14 February 2019 / Revised: 11 March 2019 / Accepted: 12 March 2019 / Published: 15 March 2019
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During creep, magnesium alloys undergo microstructural changes due to temperature and stress. These alterations are associated with the evolution of the present phases at a microstructural level, creating different strain rates during primary and tertiary creep, and with the stability of the inter-metallic phase Mg17Al12 formed at these temperatures. In this paper, the results of creep testing of high-pressure die-cast AZ91 magnesium alloys are reported. During creep, continuous and discontinuous precipitates grow, which influences creep resistance. The creep mechanism that acts at these intermediate temperatures up to 150 °C is termed dislocation climbing. Finally, the influence of the type of precipitates on the creep behavior of alloys is determined by promoting the formation of continuous precipitates by a short heat treatment prior to creep testing. View Full-Text
Keywords: AZ91; magnesium alloys; creep; high pressure die casting AZ91; magnesium alloys; creep; high pressure die casting

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Preciado, M.; Bravo, P.M.; Calaf, J.; Ballorca, D. Strain Rate during Creep in High-Pressure Die-Cast AZ91 Magnesium Alloys at Intermediate Temperatures. Materials 2019, 12, 872.

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