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Part A: Materials Science

Phase change of CoTi and Co3Ti induced by MeV-scale electron irradiation

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Pages 2027-2039 | Received 14 Mar 2016, Accepted 26 Apr 2016, Published online: 20 May 2016
 

Abstract

This study investigates equilibrium-to-nonequilibrium solid phase transitions induced by MeV-scale electron irradiation in B2-CoTi and L12-Co3Ti intermetallic compounds by means of high-voltage electron microscopy. Under MeV-scale electron irradiation, B2-CoTi transforms into a body-centered cubic solid solution through chemical disordering and eventually transforms into an amorphous phase. The critical temperature for amorphisation is found to be 110 K. L12-Co3Ti also exhibits chemical disordering at temperatures below 700 K. However, its amorphisation does not occur even at a low temperature of 20 K. The dominant factor in these solid phase transitions is discussed in terms of the Gibbs free energy.

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