The Effect of Simultaneous Electron and Kr⁺ Irradiation on Amorphization of CuTi

Abstract

CuTi was irradiated with 1-MeV electrons and Kr+ ions simultaneously at temperatures from 10 to 423 K. Retardation of Kr+-induced amorphization was observed with simultaneous electron irradiation at 295 and 423 K. The retardation effect increased with increasing irradiation temperature and relative electron-to-Kr dose rate. In contrast, simultaneous irradiation below 100 K showed an additive effect of electron- and Kr+-induced amorphization. The results can be explained by the mobility point defects introduced by electron irradiation interacting with Kr+-induced displacement cascades.

Radiation-induced crystalline-to-amorphous transition in intermetallic compounds of the CuTi alloy system

“…There is no measurements of the volume expansions at the onset of amorphization in the intermetallics of the Cu-Ti system. However, the simulation results appear consistent with those calculated for NiZr 2 [12] and NiZr [26], as well as with those obtained experimentally for other compounds_ including Zr3A1 [5], NiAI [7], Nb3Ge [27,28], and Mo3Si [29].…”

“…At the onset of amorphization, S decreases to-0.2 [4][5][6], and the volume expansion saturates at values between 2% [5] and 6% [7]. And thirdly, in compounds that become amorphous during irradiation, e.g., Zr3A1, FeTi and Nb3Ir, the velocity of acoustic phonons decreases by~70% when amorphization occurs [2].…”

“…And thirdly, in compounds that become amorphous during irradiation, e.g., Zr3A1, FeTi and Nb3Ir, the velocity of acoustic phonons decreases by~70% when amorphization occurs [2]. Since the sound velocity is proportional to the square root of the average shear modulus, the latter' is found to drop by a factor of~2 [5,7].…”