title: Formation of Al3Ti/Mg composite by powder metallurgy of Mg-Al-Ti system.
abstract: Anin situtitanium trialuminide (Al3Ti)-particle-reinforced magnesium matrix composite has been successfully fabricated by the powder metallurgy of a Mg-Al-Ti system. The reaction processes and formation mechanism for synthesizing the composite were studied by differential scanning calorimetry (DSC), x-ray diffractometry (XRD), scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDS). Al3Ti particles are found to be synthesizedin situin the Mg alloy matrix. During the reaction sintering of the Mg-Al-Ti system, Al3Ti particles are formed through the reaction of liquid Al with as-dissolved Ti around the Ti particles. The formed intermetallic particles accumulate at the original sites of the Ti particles. As sintering time increases, the accumulated intermetallic particles disperse and reach a relatively homogeneous distribution in the matrix. It is found that the reaction process of the Mg-Al-Ti system is almost the same as that of the Al-Ti system. Mg also acts as a catalytic agent and a diluent in the reactions and shifts the reactions of Al and Ti to lower temperatures. An additional amount of Al is required for eliminating residual Ti and solid-solution strengthening of the Mg matrix.
authors.affiliation: School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China.
authors.forename: Zi R
authors.initials: ZR
authors.lastname: Yang
authors.affiliation: School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China.
authors.forename: Shu
authors.initials: S
authors.lastname: Qi Wang
authors.affiliation: School of Materials Science and Engineering, Jilin University, Changchun 130022, People's Republic of China.
authors.forename: Xiang H
authors.initials: XH
authors.lastname: Cui
authors.affiliation: School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China.
authors.forename: Yu T
authors.initials: YT
authors.lastname: Zhao
authors.affiliation: School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China.
authors.forename: Ming J
authors.initials: MJ
authors.lastname: Gao
authors.affiliation: School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China.
authors.forename: Min X
authors.initials: MX
authors.lastname: Wei
keywords: Mg–Al–Ti system; intermetallics; metal-matrix composites (MMCs); powder metallurgy