Highly porous spark plasma sintered Ni-Mn-Ga structures

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Abstract

A new approach for the processing of porous crystalline Ni-Mn-Ga compacts by spark plasma sintering (SPS) from a mixture of gas atomized Ni-Mn-Ga and NaCl powders (25/75 vol%) is reported. The NaCl was removed to reveal a highly porous skeleton of Ni-Mn-Ga. Solid skeletons were heat-treated in vacuum to grow the grains to a size of 22–23 μm, from the 1.7 μm found in the powder. The sample with the highest porosity showed a magnetic-field-induced strain of 1.24%. The MFIS is attributed to magnetically induced twinning due to the reduction of grain boundary constraints and the formation of preferred orientation.

Details

Original languageEnglish
Pages (from-to)148-151
Number of pages4
JournalScripta Materialia
Volume139
Publication statusPublished - 1 Oct 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • Ferromagnetic shape memory alloy, Magnetic-field-induced strain, Porous material, Spark plasma sintering

ID: 14495752