Abstract
We describe three sets of experiments performed at Argonne National Laboratory over the past few years. These experiments deal with atomic rearrangements in the ordered alloys Ni3Mn and Cu3Au during fast and thermal neutron bombardment. The unique mag-netic properties of ordered Ni3Mn are utilized to investigate radiation damage produc-tion mechanisms at low temperature (5 K) where defect migration is not possible and only disordering is observed. In the case of thermal neutron bombardment, the average recoil energy is about 450 eV and significant disordering due to (110) replacement col-lision sequences is observed. For fast neutron bombardment where typical recoil ener-gies are 20 keV, significant random disordering is observed but no evidence for sizable replacement sequences is found. The bombardment of ordered Cu3Au by fast and thermal neutrons at higher temperature (∼150°C) is studied by electrical resistance techniques. Both ordering and disordering are observed and related to the number of migrating vacan-cies escaping from the high energy collision cascade.
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This paper is based on a presentation made at a symposium on “Radiation Induced Atomic Rearrangements in Ordering and Clustering Alloys” held at the annual meeting of the AIME, Atlanta, Georgia, March 7 to 8, 1977, under the sponsorship of the Physical Metallurgy and Nuclear Metallurgy Committees of The Metallurgical Society of AIME.
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Kirk, M.A., Blewitt, T.H. Atomic rearrangements in ordered fcc alloys during neutron irradiation. Metall Trans A 9, 1729–1737 (1978). https://doi.org/10.1007/BF02663402
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DOI: https://doi.org/10.1007/BF02663402