A Study on Ultra-Hard AlMgB₁₄ Modified by TiB₂ and Ni₃Al

Abstract:

AlMgB₁₄ is a very hard and brittle material which need be modified for utilizing as cutting tool materials. In present study, TiB₂ and Ni₃Al were used to strengthen and toughen AlMgB₁₄ material. The microstructure of the AlMgB₁₄-TiB₂-Ni₃Al composites was analysized by scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDX) and an X-ray diffractometer (XRD). The hardness and fracture toughness of the AlMgB₁₄-TiB₂Ni₃Al composites were also examined. The results showed that the major phases in AlMgB₁₄-Ni₃Al composites were TiB₂, AlMgB₁₄, MgAl₂O₄ , Ni₃Al and NiAl. With the increasing of the amount of Ni₃Al, more intergranular fractured features can be found in the fractured surface of the composites, the hardness and fracture toughness of the composites were both decreased comparing to the synthesised AlMgB₁₄. The AlMgB₁₄-TiB₂-4wt.% Ni₃Al composite has a hardness of 28.1 Gpa and a fracture toughness of 3.14 MPa·m^1/2.

• Periodical: Materials Science Forum (Volume 848)
• Pages: 607-612
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.848.607
• Online since: March 2016
• Authors: Yu Mei Zhou, Feng Lin Zhang, Peng Cheng Li, Kun Bai, Shang Hua Wu
• Keywords: AlMgB₁₄, Mechanical Properties, Microstructual Characterization, Ni₃Al, TiB₂

References

[1] B.A. Cook, J.L. Harringa, T.L. Lewis, A.M. Russel, A new class of ultra-hard materials based on AlMgB14, Scripta Mater. 42(2000), 597-602.

DOI: 10.1016/s1359-6462(99)00400-5

[2] B.A. Cook, J.L. Harringa, A.M. Russell, T.L. Lewis, Superabrasive boride and a method of preparing the same by mechanical alloying and hot pressing, U.S. Patent 6, 099, 605. (2000).

[3] R. Bodkin, A synthesis and study of AlMgB14, University of Witwatersrand, (2005).

[4] T.L. Lewis, A study of selected properties and applications of AlMgB14 and related composites, Iowa State University, (2001).

[5] A. Ahmed, S. Bahadur, A.M. Russell, B.A. Cook, Belt abrasion resistance and cutting tool studies on new ultra-hard boride material, Tribol. Int. 42(2009), 706-713.

DOI: 10.1016/j.triboint.2008.10.013

[6] R. Cherukuri, M. Womack, P. Molian, A. Russell, Y. Tian, Pulsed laser deposition of AlMgB14 on carbide insets for metal cutting, Surf. Coat. Tech. 155(2002), 112-120.

DOI: 10.1016/s0257-8972(02)00050-6

[7] B.A. Cook, Y. Tian, J.L. Harringa, A.M. Russell, Ultra-hard low friction coating based on AlMgB14 for reduced wear of MEMS and other tribological components and system, U.S. Patent 2, 010, 074, 8A1. (2005).

[8] B.A. Cook, A.M. Russell, J.L. Harringa, T.L. Lewis, AlMgB14 based cermet with ductile Co-Mn binder phase, W.O. Patent 0430A1. (2004).

[9] Z.Q. Liu, Y. Wan, C.Z. Huang, J.G. Liu, A hierarchically nested gradient function ceramic cutting tool and its preparation method, Chinese Patent 200910256570. 6. (2010).

[10] S. Skirl, R. Krause, S. M. Wiederhorn, Processing and Mechanical Properties of Al2O3/Ni3Al Composites with Interpenetrating Network Microstructure, Am. Ceram. Soc. 84(2001), 2034–(2040).

DOI: 10.1111/j.1151-2916.2001.tb00954.x

[11] D.K. Shetty, P.N. Wright, A.H. Mincer, Hidentation Fracture of WC-Co Cermets, J. Mater. Sci. 20(1985), 1873-1882.

DOI: 10.1007/bf00555296

[12] R. Darolia, W.S. Walston, Development and characterization of high strength NiAl single crystal alloys, First International Symposium on Structural Intermetallics. Champion, Pennsylvania, USA(1997)585-594.