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Title: Effects of strain rate on tensile properties of pure Mg and in situ AlN reinforced Mg-5Al composite
Authors: Thein, M.A.
Lu, L. 
Lai, M.O. 
Keywords: Mechanical milling
Powder metallurgy
Strain rate sensitivity
Tensile testing
Issue Date: 25-Nov-2010
Citation: Thein, M.A., Lu, L., Lai, M.O. (2010-11-25). Effects of strain rate on tensile properties of pure Mg and in situ AlN reinforced Mg-5Al composite. Materials Science and Engineering A 528 (1) : 239-246. ScholarBank@NUS Repository.
Abstract: Bulk pure Mg and Mg-5Al-1AlN composite samples with various grain sizes were synthesized by consolidation of powders mechanically milled (MMed) for over various milling durations, followed by sintering and extrusion. Both materials displayed distinct tensile behaviors at different tensile strain rates (3.33×10-3s-1, 3.33×10-4s-1 and 3.33×10-5s-1) with strain-rate sensitivity index (m) of 0.015-0.088 for composite samples and 0.014-0.118 for pure Mg samples. Enhanced strain-rate sensitivity at longer milling duration indicates significant time dependent plasticity or creep at room temperature. Unusually small apparent activation volume and the apparent activation energy of 50kJmol-1 which is close to the activation energy for grain boundary diffusion of Mg suggest that below a critical nanograin size, the deformation is controlled by grain boundary sliding with simultaneous grain boundary diffusion. © 2010 Elsevier B.V.
Source Title: Materials Science and Engineering A
ISSN: 09215093
DOI: 10.1016/j.msea.2010.09.015
Appears in Collections:Staff Publications

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