Critical cooling rate and thermal stability of Zr-Ti-Cu-Ni-Be alloys

Waniuk, Theodore A.; Schroers, Jan; Johnson, William L.
February 2001
Applied Physics Letters;2/26/2001, Vol. 78 Issue 9, p1213
Academic Journal
The critical cooling rate as well as the thermal stability are measured for a series of alloys in the Zr-Ti-Cu-Ni-Be system. Upon cooling from the molten state with different rates, alloys with compositions ranging along a tie line from (Zr[sub 70]Ti[sub 30])[sub 55](Ni[sub 39]Cu[sub 61])[sub 25]Be[sub 20] to (Zr[sub 85]Ti[sub 15])[sub 55](Ni[sub 57]Cu[sub 43])[sub 22.5]Be[sub 27.5] show a continuous increase in the critical cooling rate to suppress crystallization. In contrast, thermal analysis of the same alloys shows that the undercooled liquid region, the temperature difference between the glass transition temperature and the crystallization temperature, is largest for some compositions midway between the two endpoints, revealing that glass forming ability does not correlate with thermal stability. The relationship between the composition-dependent glass forming ability and thermal stability is discussed with reference to a chemical decomposition process. © 2001 American Institute of Physics.


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