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Positron annihilation study on repeated deformation/precipitation aging in Fe-Cu-B-N alloys
He, S. M.; Brandhoff, P. N.; Schut, H.; van der Zwaag, S.; van Dijk, N. H.
2013
Source PublicationJOURNAL OF MATERIALS SCIENCE
ISSN0022-2461
Volume48Issue:18Pages:CONCATENATE(Sheet1!I254,-Sheet1!J254)
AbstractWe have investigated the influence of deformation-induced defects on the isothermal Cu precipitation at 550 A degrees C in an as-quenched (solute supersaturated) and annealed (solute depleted) Fe-Cu-B-N alloy by positron annihilation spectroscopy. Preferred precipitation of supersaturated Cu at defects sites was recently proposed as a self-healing mechanism for deformation damage. Repeated deformation/aging cycles result in a significant increase in tensile strength for as-quenched samples. Positron Annihilation Lifetime Spectroscopy revealed a larger positron lifetime for the annealed samples compared to the as-quenched samples caused by the additional open-volume defects at incoherent interfaces between Cu precipitates and the matrix. For both as-quenched and annealed samples deformation generates new defects (mainly dislocations), while subsequent aging leads to a reduction in the density of these defects. Simultaneous Coincidence Doppler Broadening measurements monitored the evolution of local environment at the positron annihilation sites (defects, Cu precipitates and matrix) during the repeated deformation/aging cycles. For the as-quenched samples, aging after deformation results in a sharp decrease in the defect contribution combined with a strong increase in the copper signature, which can be attributed to preferential copper precipitation at the defects introduced by plastic deformation. For the annealed samples, aging after deformation leads to a much weaker evolution of the Cu signature.
Indexed BySCI
Language英语
Funding Project应物所项目组
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/13858
Collection中科院上海应用物理研究所2011-2019年
Recommended Citation
GB/T 7714
He, S. M.,Brandhoff, P. N.,Schut, H.,et al. Positron annihilation study on repeated deformation/precipitation aging in Fe-Cu-B-N alloys[J]. JOURNAL OF MATERIALS SCIENCE,2013,48(18):CONCATENATE(Sheet1!I254,-Sheet1!J254).
APA He, S. M.,Brandhoff, P. N.,Schut, H.,van der Zwaag, S.,&van Dijk, N. H..(2013).Positron annihilation study on repeated deformation/precipitation aging in Fe-Cu-B-N alloys.JOURNAL OF MATERIALS SCIENCE,48(18),CONCATENATE(Sheet1!I254,-Sheet1!J254).
MLA He, S. M.,et al."Positron annihilation study on repeated deformation/precipitation aging in Fe-Cu-B-N alloys".JOURNAL OF MATERIALS SCIENCE 48.18(2013):CONCATENATE(Sheet1!I254,-Sheet1!J254).
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