Correlation between the structure and internal friction of metallic glass Cu45Ti55

Microstructure and Interfacial Reactions During Vacuum Brazing of Stainless Steel to Titanium Using Ag-28 pct Cu Alloy

“…[44] During the process of solidification, the crystallization of the tetragonal phases CuTi 2 (C11b type) and c-CuTi (B11 type) is known to compete with the process of amorphization. [43,45,50] The tendency of crystallization of the amorphous phase formed in the BZ of the present SS/Ti joints was illustrated quite distinctly using TEM analysis. It may be assumed therefore that the crystallites formed in the amorphous phase are either of CuTi 2 or CuTi phase.…”

“…The Cu-Ti system is known to form metallic glass and extensive work on the crystallization behavior of the amorphous phases of this system has been reported in the literature. [41][42][43][44][45][46][47][48][49][50] It may be noted that in the present case, the brazing experiments were carried out using induction heating with a relatively high rate of about 1.667 K/s (100 C/min). The rate of cooling in this case was also very high owing to the fact that only the joining specimens, and not the entire chamber, were heated during brazing.…”

“…[41][42][43][44][45][46][47][48][49][50] Formation of amorphous phase in a wide range of compositions around Cu 50 Ti 50 has been demonstrated using rapid solidification, [41][42][43][44][45][46][47] pulsed laser quenching, [43] and mechanical alloying. [48] The kinetics of crystallization of these alloys were found to be sluggish, and the activation energy for crystallization (Q) was reported to vary between 71.4 and 126 kJ/ mol in the composition range Cu x Ti 1Àx , where 0.35 <x< 0.65 with a maximum at x ¼ 0:55.…”