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Licensed Unlicensed Requires Authentication Published by De Gruyter December 30, 2021

In-situ Formation of TiB2 Reinforced Aluminium via Mechanical Alloying

Li Lu, Man On Lai, Xiao Ping Niu and Han Neng Ho

Abstract

This paper investigates the possibility of in-situ formation of TiB2 ceramic particulates via the process of mechanical alloying of elemental Ti and B powders in a system diluted with Al. Elemental Al powder was mechanically milled together with Ti and B powders in a high energy planetary ball mill. 30 stainless steel balls with diameter of 15 mm were employed. The ball to powder weight ratio was 20:1. X-ray spectra revealed the evolution of structural changes of the alloyed powder particles. No evidence of formation of TiB2 was manifested when the milling duration was shorter than 30 h. A TiB2-like structure could be detected only after 40 hour of milling. Because of broadening and weakening of the X-ray diffraction (XRD) peaks corresponding to Al and TiB2 structures as a result of refinement of crystalline size and the presence of large structural distortion, only very weak and vague TiB2 XRD peaks could be detected. Clear evidence of formation of TiB2 was, however, observed when the mechanically alloyed powder was annealed. Therefore, the results of the present investigation clearly indicate that formation of in-situ TiB2 particulates within Al is possible although a longer milling duration is required. Mechanical testing shows that both the 0.2 % yield and the ultimate tensile stresses are increased with MA duration and sintering duration.


X.P. Niu Gintic Institute of Manufacturing Technology 71 Nanyang Drive, Singapore 63075
L. Lu, M.O. Lai, H.N. Ho Department of Mechanical & Production Engineering The National University of Singapore 10 Kent Ridge Crescent Singapore 119260

  1. Lu and Lai wish to acknowledge the financial support provided by The National University of Singapore through a research grant, RP960652.

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Received: 1998-02-03
Published Online: 2021-12-30

© 1998 Carl Hanser Verlag, München