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Irradiation-induced disordering and amorphization of Al<sub>3</sub>Ti-based intermetallic compounds
Park, Jeong-Yong,Kim, Il-Hyun,Motta, Arthur T.,Ulmer, Christopher J.,Kirk Jr., Marquis A.,Ryan Jr., Edward A.,Baldo Jr., Peter M. Elsevier 2015 JOURNAL OF NUCLEAR MATERIALS Vol.467 No.2
<P><B>Abstract</B></P> <P>An in situ ion-irradiation study, simultaneously examined using transmission electron microscopy, was performed to investigate irradiation-induced disordering and amorphization of Al<SUB>3</SUB>Ti-based intermetallic compounds. Thin foil samples of two crystalline structures: D0<SUB>22</SUB>-structured Al<SUB>3</SUB>Ti and L1<SUB>2</SUB>-structured (Al,Cr)<SUB>3</SUB>Ti were irradiated using 1.0 MeV Kr ions at a temperature range from 40 K to 573 K to doses up to 4.06 × 10<SUP>15</SUP> ions/cm<SUP>2</SUP>. The results showed that both the compounds underwent an order-disorder transformation under irradiation, where both Al<SUB>3</SUB>Ti and (Al,Cr)<SUB>3</SUB>Ti ordered structures were fully transformed to the disordered face-centered cubic (FCC) structure except at the highest irradiation temperature of 573 K. A slightly higher irradiation dose was required for order-disorder transformation in case of Al<SUB>3</SUB>Ti as compared to (Al,Cr)<SUB>3</SUB>Ti at a given temperature. However, their amorphization resistances were different: while the disordered FCC (Al,Cr)<SUB>3</SUB>Ti amorphized at the irradiation dose of 6.25 × 10<SUP>14</SUP> ions/cm<SUP>2</SUP> (0.92 dpa) at 40 K and 100 K, the Al<SUB>3</SUB>Ti compound with the same disordered FCC structure maintained crystallinity up to 4.06 × 10<SUP>15</SUP> ions/cm<SUP>2</SUP> (5.62 dpa) at 40 K. The critical temperature for amorphization of (Al,Cr)<SUB>3</SUB>Ti under Kr ion irradiation is likely between 100 K and room temperature and the critical temperature for disordering between room temperature and 573 K.</P>