The Effect of Preliminary Mechanical Activation on the Structure and Mechanical Properties of Ni₃Al+B Material Obtained by SPS

Abstract:

In the present study, a mixture of powders (87.9 at.% Ni, 12 at.% Al, 0.1 at.% B) was used as the initial material to produce sintered Ni₃Al + B alloy. Spark Plasma Sintering (SPS) method was used to compact the powder. The powder mixtures were previously prepared in two ways: mixing the initial powders in a mortar (М1) and mechanical activation (М2). The microstructure was observed using optical microscope (OM). The addition of small amount of boron to the initial mixture of nickel and aluminum improves the density of the sintered Ni₃Al intermetallic compound (98.8%). The results of density, bending and microhardness tests showed, that the provisional three-minute mechanical activation improves almost all properties of the sintered material. The compact obtained by SPS by M2 contributes to the formation of a homogeneous fine-grained structure of the material. It leads to further increase in flexural bending strength up to 2200 MPa. This value is almost 8 times the strength of the intermetallic Ni₃Al stoichiometric composition obtained by SPS.

• Periodical: Key Engineering Materials (Volume 743)
• Pages: 19-24
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.743.19
• Online since: July 2017
• Authors: Lilia I. Shevtsova*, Anatoliy A. Bataev, Vyacheslav I. Mali, Maksim A. Esikov, Veronika V. Sun Shin Yan, Danil A. Nemolochnov, Tatyana Zimoglyadova
• Keywords: Boron, Intermetallics, Mechanical Activation, Nickel Aluminide, Spark Plasma Sintering

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