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Sintering and Mechanical Properties of AlMgB14 Composite Materials
M. Herrmann1, R. Bodkin2, N. J. Coville2, I. Sigalas3, M. Thiele1
1 Fraunhofer Institute of Ceramic Technologies and Systems, Dresden, Germany
2 DST/NRF Centre of Excellence in Strong Materials and Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg, South Africa.
3 DST/NRF Centre of Excellence in Strong Materials at the School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Johannesburg, South Africa.
received May 26, 2010, received in revised form July 21, 2010, accepted September 24, 2010
Vol. 2, No. 1, Pages 55-60 DOI: 10.4416/JCST2010-00020
Abstract
Different AlMgB14 composite materials were prepared from pre-reacted AlMgB14 and starting elemental powders by hot pressing. Only slightly different densification behaviours were found for the two types of starting materials. Full densification without decomposition was achieved only with a hot pressing pressure of 75 MPa. Different additives were tested to improve densification. The influence of the additives on the densification was found to be minor. A strong increase in hardness was observed for materials with Si, TiC, WC, TiB2 additions. The carbides react with the AlMgB14 during sintering, forming TiB2 and WB2 or their solid solutions.
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Keywords
Boride, sintering, microstructure, AlMgB14
References
1 Werheit, H., Leithe-Jasper, A., Tanaka, T., Rotter, H.W., Schwetz, K.A.: Some properties of single-crystal boron carbide, J. Solid State Chem., 177, 575-579, (2004).
2 He, D., Zhao, Y., Daemen, L., Qian, J., Shen, T.D., Zerda, T.W.: Boron suboxide: As hard as cubic boron nitride, Appl. Phys. Lett., 81, 643-645, (2002).
3 Nieto-Sanz, D., Loubeyre, P., Crichton, W., Mezouar, M.: X-ray study of the synthesis of boron oxides at high pressure: Phase diagram and equation of state, Phys. Rev. B, 70, 214108, (2004).
4 Itoh, H., Maekawa, I., Iwahara, H.: High pressure sintering of B6O powder and properties of the sintered compact, J. Soc. Mat. Sci., Japan, 47, 1000-1005, (1998).
5 Badzian, A.R.: Applied Physics Letters, 53, 2495-2497, (1988).
6 Hebache, M.: The Search for Superhard Materials: Doped boron, EPL, 87, 16001, (2009).
7 Higashi, I., Ito, T.: Refinement of the structure of magnesium aluminum boride (MgAlB14), J. Less Common Met., 92, 239-46, (1983).
8 Cook, B.A., Harringa, J.L., Lewis, T.L., Russell, A.M.: A new class of ultra-hard materials based on AlMgB14, Scripta Mater., 42, 597-602, (2000).
9 Okada, S., Shishido, T., Mori, T., Iizumi, K., Kudou, K., Nakajima, K.: Crystal growth of MgAlB14-type compounds using metal salts and some properties, J. Alloy Compd., 458, 297-301, (2008).
10 Lowther, J.E.: Possible ultra-hard materials based upon boron icosahedra, Physica B, Condensed Matter, 322, 173-178, (2002).
11 Kölpin, H., Music, D., Henkelman, G., Schneider, J.M.: Phase stability and elastic properties of XMgB14 studied by ab initio calculations (X=Al,Ge,Si,C,Mg,Sc,Ti,V,Zr,Nb,Ta,Hf), Physical Review B, 78, 054122, (2008).
12 Kevorkijan, V., Skapin, S.D., Jelen, M., Krnel, K., Meden, A.: Cost-effective synthesis of AlMgB14-xTiB2, J. Eur. Cer. Soc., 27, 493-497, (2007).
13 Ahmeda, A., Bahadura, S., Cook, B.A., Peters, J.: Mechanical properties and scratch test studies of new ultra-hard AlMgB14 modified by TiB2, Tribol. Int., 39, 129-137, (2006).
14 Ahmeda, A., Bahadur, S., Russell, A.M., Cook, B.A.: Belt abrasion resistance and cutting tool studies on ultra-hard boride materials, Tribol. Int., 42, 706-713, (2009).
15 Roberts, D.J., Zhao, J., Munir, Z.A.: Mechanism of reactive sintering of MgAlB14 by pulse electric current, Int. J. Refract. Met. H., 27, 556-563, (2009).
16 Bodkin, R., Herrmann, M., Coville, N.J., Sigalas, I.: A study of the Al-MgB ternary phase diagram, Int. J. Mat. Res. (formerly Z. Metallkd.), 100, 105-109, (2009).
17 Lewis, T.L., Cook, B.A., Harringa, J.L., Russell, A.M.: Al2MgO4, Fe3O4 and FeB impurities in AlMgB14, Mat. Sci. and Eng. A, 351, 117, (2003).
18 Anstis, G.R., Chantikul, P., Lawn, B.R., Marshall, D.B.: A critical evaluation of indentation techniques for measuring fracture toughness: I. Direct crack measurements, J. Amer. Ceram. Soc., 64, 533-8, (1981).
19 Yongbin, L., Harmon, B.N.: First principles calculation of elastic properties of AlMgB14, J. Alloy. Compd., 338, 242-247, (2002).
20 Frotscher, M., Klein, W., Bauer, J., Fang, C.M., Halet, J.F., Senyshyn, A., Baehtz, C., Albert, B.: A Reinvestigation of the Mo/B and W/B System, Z. Anorg. Allg. Chem., 633, 2626, (2007).
21 Telle, R., Fendler, E., Petzow, G.: The quasi-binary systems CrB2-TiB2, CrB2-WB2, TiB2-WB2, J. Hard. Mat., 3, 211-224, (1992)
22 Mitra, I., Telle, R.: Phase formation during anneal of supersaturated TiB2-CrB2-WB2 solid solutions, J. Solid State Chem., 133, 25, (1997).
23 Telle, R., Sigl, L. S., Takagi, K.: Boride-based Hard Materials, R. Riedel, Handbook of Ceramic Hard Materials, Wiley-VCH, 802-933, (2000).
24 Riedel, R.: Handbook of Ceramic Hard Materials, Wiley-VCH, 968, (2000).
25 Quinn, G., Bradt, R.: On the Vickers Indentation Fracture Toughness Test, J. Am. Ceram. Soc., 90, 673, (2007)
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