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Long-range effect of ion irradiation on Cu surface segregation in a CuNi system |
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| Authors: | Li Zhang Guangze Tang Xinxin Ma F. Michael RussellXingzhong Cao Baoyi WangPeng Zhang |
| Affiliation: | a State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China b National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China c School of Mathematical and Computer Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK d Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China |
| Abstract: | Ni films were deposited on one side of single crystal Cu substrate discs of 1.0 and 1.5 mm thickness. These discs were irradiated on the Cu side with argon ions. Evidence for enhanced Cu segregation at the Ni surface was found for both thicknesses. This effect decreased with increasing distance between the diffusion zone and the irradiated surface. Slow positron annihilation results indicate lower vacancy-like defects at the subsurface layer after Ar irradiation on the other surface of Cu disks. Such long-range effect is here interpreted on the basis of a particular type of mobile discrete breather called quodon. |
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