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1. chinaXiv:201703.00560 [pdf]

A study of Cu precipitates in Fe ions irradiated Fe-Cu alloys by positron annihilation techniques

X. Z. Cao; P. Zhang; Q. Xu; G. D. Cheng; H. B. Wu; X. P. Jiang; R. S. Yu; L. Wei; B. Y. Wang
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties

Cu precipitates played a key factor in irradiation induced hardening and embrittlement of reactor pressure vessel (RPV).In this work, two kinds of Fe-Cu model alloys with different Cu contents irradiated by Fe ion at 573 K were investigated using positron annihilation techniques and SEM. Doppler Broadening Spectroscopy(DBS) results indicated that with the irradiation dose increased from 0.1 dpa to 1.2 dpa, more vacancy-type defects were induced during Fe ion irradiation, and with different Cu contents, defects condition had few changes. Coincident Doppler Broadening (CDB) results indicated Cu precipitates were formed during the irradiation, which could be verified through the SEM results. The CDB results also showed that the Cu precipitates were the same at 0.1 dpa between the samples with different Cu contents. In Fe0.6Cu samples, more Cu precipitates were formed than that of Fe0.3Cu sample at 1.2 dpa.

submitted time 2017-03-26 Hits1308Downloads756 Comment 0

2. chinaXiv:201703.00534 [pdf]

Helium retention and thermal desorption from defects in Fe9Cr binary alloys

T. Zhu; X. Z. Cao; S. X. Jin; J. P. Wu; Y. H. Gong; E. Y. Lu; B. Y. Wang; R. S. Yu; L. Wei
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties

In order to study the fundamental processes of helium retention and thermal desorption from the structural material of future fusion reactors, thermal desorption measurements were performed to investigate helium trapping from defects in binary Fe9Cr model alloys irradiated by 3 keV and 0.2 keV He ions. Interstitial type dislocation loops, vacancies and vacancy clusters were produced by irradiation with 3 keV helium ions, which acted as the sink trapped the helium atoms. Helium thermal desorption peaks from dislocations, helium-vacancies were obtained by thermal desorption spectroscopy at ~ 540 篊, in the range from 205 篊 to 478 篊, respectively. Simple first order dissociation kinetics are used to estimate the activation energies associated with the desorption groups. A sharp desorption peak was observed at ~ 865 篊 due to the BCC-FCC phase transformation for specimens under all examined implantation conditions.

submitted time 2017-03-24 Hits1360Downloads739 Comment 0

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