Strain Rate Effects on the Flow Behaviour and Microstructure of ECAPed Magnesium-Alloys

Lutz Krüger; Friederike Schwarz; Ulrich Martin; Hans Jørgen Roven

doi:10.4028/www.scientific.net/MSF.690.323

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HomeMaterials Science ForumMaterials Science Forum Vol. 690Strain Rate Effects on the Flow Behaviour and...

Strain Rate Effects on the Flow Behaviour and Microstructure of ECAPed Magnesium-Alloys

Abstract:

Three alloys of the magnesium AZ-series (AZ31, AZ61 and AZ91) were processed by multi-temperature equal channel angular pressing (ECAP) with five passes using route B_C. The ECAP temperature was decreased from 275 °C to 250 °C during the process for better grain refinement. The mechanical behaviour was investigated over a wide range of strain rates (10^-3s^-1 up to 10³s^-1) under compressive loading at room temperature. The investigations show that significant grain refinement takes place during the ECAP-process. The initial grain size of 12 μm, 9 μm and 5.8 μm for extruded AZ31, AZ61 and AZ91, respectively, could be refined to 2.5 μm. The grain refinement occurs by dynamic recrystallisation. Compared to extruded initial Mg-alloys, the yield stress increases slightly for all selected alloys after ECAP processing, while the amount of strain hardening decreases at the same time, due to reduced grain size and texture effects. Furthermore, the flow stress of extruded and ECAPed material is less affected by strain rates within a range of 10^-3s^-1 to 10^-1s^-1.

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Periodical:

Materials Science Forum (Volume 690)

Pages:

323-326

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.690.323

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Online since:

June 2011

Authors:

Lutz Krüger, Friederike Schwarz, Ulrich Martin, Hans Jørgen Roven

Keywords:

Compression Test, Equal-Channel Angular Pressing (ECAP), Magnesium Alloy, Split Hopkinson Pressure Bar (SHPB), Strain Rate

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