Abstract
This article investigated microstructure, martensitic transformation and mechanical property of porous NiMnGa alloys fabricated by one-step sintering method using Mg powder as a pore former. The overall pore size was decreased with decreasing Mg content due to the reduction of aggregation tendency of Mg particles. Residual Mg existed mainly in the pore wall (interfacial areas between NiMnGa and Mg) due to interfacial reactions. The porous alloys with different porosity exhibited one-step martensitic transformation with close transformation temperatures and the temperature of martensitic transformation was lower for the porous alloys than the original NiMnGa powder. The porous NiMnGa alloys exhibited a low compressive strength and ductility due to the existence of pores. The porous NiMnGa alloys with continuous pore wall structure could be a better candidate than NiMnGa particles to form composites with ductile matrix.
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