Investigation on B, Cr Doped Ni₃Al Alloy Prepared by Self-Propagation High-Temperature Synthesis and Hot Extrusion

Abstract:

The Ni₃Al and Ni₃Al-B-Cr alloys were fabricated by the self-propagation high-temperature synthesis with hot extrusion method. Their microstructure and mechanical properties were studied by using combination of X-ray diffraction, optical microscopy, transmission electron microscopy and compression test. Analysis of X-ray spectra exhibited that the elemental powders had been transformed to the Ni₃Al phase after the self-propagation high-temperature synthesis processing. Microstructure examination showed that the alloy without extrusion consisted of coarse and fine grains, but the subsequent hot extrusion procedure homogenized the grain size and densified the alloy obviously. Transmission electron microscopy observations on the Ni₃Al alloy revealed that Ni₃Al, γ-Ni and Al₂O₃ particles were the main phases. When the boron and chromium were added, besides the β-NiAl phase, α-Cr phase and some Cr₇Ni₃ particles with stacking faults inside were observed. In addition, a lot of substructure and high-density dislocation arrays were observed in the extruded part, which indicated that the subsequent extrusion had led to great deformation and partly recrystallizing in the alloy. Moreover, the subsequent extrusion procedure redistributed the Al₂O₃ particles and eliminated the γ-Ni. These changes were helpful to refine the microstructure and weaken the misorientation. The mechanical test showed that the self-propagation high-temperature synthesis with hot extrusion improved the mechanical properties of the Ni₃Al alloy significantly. The addition of B and Cr in Ni₃Al alloy increased the mechanical properties further, but the compressive strength of the alloy was still lower than that synthesized by combustion. Finally, the self-propagation high-temperature synthesis with hot extrusion was a good method to prepare Ni₃Al alloy from powder.

• Periodical: Materials Science Forum (Volumes 747-748)
• Pages: 124-131
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.747-748.124
• Online since: February 2013
• Authors: Li Yuan Sheng, Jian Ting Guo, Chao Yuan, F. Yang, G.S. Li, T.F. Xi
• Keywords: Extrusion, Mechanical Property, Microstructure, Ni₃Al, Self-Propagation High-Temperature Synthesis (SHS)

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