Cascade-driven migration of structural interfaces: A new type of irradiation-induced phase transformation

Allen, C. W.; Rehn, L. E.; Wiedersich, H.
June 1987
Applied Physics Letters;6/29/1987, Vol. 50 Issue 26, p1876
Academic Journal
In Ti-Cr alloys containing both the Laves phase (ordered TiCr2) and the β phase (bcc solid solution), 1 MeV Kr+ irradiation at temperatures <250 K amorphizes the Laves phase but not the β phase. The irradiation-induced amorphous material transforms into polycrystalline β upon warming to room temperature. In contrast, irradiation at room temperature causes the β phase to grow by migration of the β/Laves interface; no change in local composition across the migrating interface is observed. The β phase also grows during prolonged irradiation at 100 K, but the velocity of the β/amorphous interface per unit calculated atomic displacement rate is more than three orders of magnitude lower than that of the β/Laves interface at room temperature. An interpretation of this new type of irradiation-induced phase transformation is presented in terms of displacement cascade formation and dynamic recovery at the structural interface that exists between the two phases.


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