Microstructure and Mechanical property of Porous Nickel aluminides Fabricated by Reactive Synthesis with Space Holder Po
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.153
Microstructure and Mechanical property of Porous Nickel aluminides Fabricated by Reactive Synthesis with Space Holder Powder Yunmao Shu1, Asuka Suzuki2, Naoki Takata2, Makoto Kobashi2 1
Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603 Japan
2
Department of Materials Process Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603 Japan
ABSTRACT
Effect of Ni:Al blending ratio on porous structure of porous nickel aluminides fabricated through reactive synthesis with space holder particles were investigated. Fabricated porous nickel aluminides had large pores derived from NaCl space holder particles and small pores derived from reactions between Ni and Al. Porosity and size of the small pores increased with increasing Al content in the raw powder mixture. Compressive property of porous NiAl are also investigated. porous NiAl exhibited good energy-absorption properties with relatively high plateau stress, high plateau end strain, and relatively flat plateau stress. This study suggests the possibility of intermetallic-based porous materials as high-performance energy absorber.
INTRODUCTION: Porous metals have unique properties like ultra-low density, energy absorption, thermal insulation, sound absorption, fluid permeability, and so on [1, 2]. For example, porous metals can absorb shock energy by deforming largely under almost constant stress during plastic deformation (plateau region). It is required that porous metals as energy absorbers have controllable plateau stress, high plateau end strain, and flat plateau region. On the other hand, transition metal aluminides like TiAl, NiAl, and Ni3Al have high melting point, high strength, high oxidation and corrosion resistance. Porous
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transition metal aluminides, which have all of these properties, are expected as a highstrength energy absorber and a heat-resistant thermal insulator. One of the methods to synthesize intermetallic compounds is combustion synthesis reaction among raw powder particles [3]. Recently, we have developed a powder metallurgical process to synthesize porous NiAl with a single phase composed of B2 crystal structure through reactive synthesis with a spacer holder [4]. In the present study, we attempted to synthesize porous nickel aluminides (NiAl3, NiAl, and Ni3Al) through the reactive process. In particular, effect of Ni:Al molar ratio on porous structure of nickel aluminides were investigated. In addition, compressive properties of porous NiAl were also studied. EXPERIMENTAL PROCEDURE Ni powder (purity: 99%, size:
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