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Dislocation driven chromium precipitation in Fe-9Cr binary alloy: a positron lifetime study |
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| Authors: | S. Hari Babu R. Rajaraman R. Govindaraj N.P. Lalla Arup Dasgupta |
| Affiliation: | 1. Materials Science Group, Indira Gandhi Centre for Atomic Research , Kalpakkam , TN, 603102 , India;2. UGC-DAE CSR , University Campus , Indore , MP, 452001 , India;3. Physical Metallurgy Group, Indira Gandhi Centre for Atomic Research , Kalpakkam , TN, 603102 , India |
| Abstract: | The influence of initial heat treatment on anomalous Cr precipitation within high temperature solubility region of the Fe–9Cr alloy has been investigated using positron lifetime studies. Air-quenched samples with pre-existing dislocations exhibited a distinct annealing stage in positron lifetime between 800 and 1100?K corresponding to Cr-precipitation. During this stage, Transmission Electron Microscopy showed fine precipitates of average size 4 nm, dispersed throughout the sample and from Energy-dispersive X-ray spectroscopy (EDS) analysis they are found to be Cr-enriched. The presence of dislocations is found to be responsible for Cr precipitation. |
| Keywords: | phase diagram Fe–Cr alloy precipitation positron annihilation microstructure |