Abstract
Porous magnesium is a new structural and functional composite material. Its special structure gives it excellent properties and widely application prospect. In this paper, nano-crystalline porous magnesium was synthesized by a combined processing of hydrogenation-dehydrogenation (HD) and spark plasma sintering (SPS) process without using blowing agents. Compared with those samples prepared by traditional powder metallurgy (TPM) method containing blowing agents, the HD-SPSed sample possesses higher porosity (28.7%) and smaller sizes and more uniform distribution of the pores. Therefore, relatively higher compression yield strength (29 MPa) and plateau stress are acquired in the compressive stress-strain curve. Furthermore, the relatively smoother stress plateau stage of the sample reveals its great potential in the application of energy absorption materials. The energy absorption, maximum energy absorption efficiency and ideal energy absorption efficiency of the HD-SPSed porous Mg could reach up to 14.9 MJ/m3, 1.90 and 1.41, respectively.
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