Positron Annihilation Studies in Search of Fine Precipitates in Fe-9Cr alloys

Babu, S. Hari; Rajaraman, R.; Govindaraj, R.; Amarendra, G.; Sundar, C. S.; Garg, Alka B.; Mittal, Raj; Mukhopadhyay, R.

doi:10.1063/1.3606332

Cited by 2 publications

(4 citation statements)

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“…When the annealing temperature was increased to 1073 K, it is generally understood that there is a dissolution of the Cr precipitates or a recovery of dislocations in the Fe‐9Cr alloy . In this reported study, explanations of the phenomena that occur at this annealing temperature can be provided in terms of the PALS and DBS results.…”

Section: Resultsmentioning

confidence: 79%

Evolution of Thermally‐Induced Microstructural Defects in the Fe‐9Cr Alloy

Lian

Cao

Zhao

et al. 2017

Physica Status Solidi (a)

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The purpose of the study detailed in this paper is to investigate the evolution of microstructural defects in the Fe‐9Cr binary alloy induced by isochronal annealing from 373 to 1223 K. Positron annihilation lifetime spectroscopy (PALS), Doppler broadening spectroscopy (DBS), positron annihilation lifetime calculation, and transmission electron microscope (TEM) are used to analyze and characterize the change of defect concentration, defect type and the micro‐morphology in the Fe‐9Cr alloy as a function of the annealing temperature. The experimental results showed that, a large number of vacancies and dislocations were found to exist in the untreated Fe‐9Cr alloy. The monovacancy (186.2 ps) in the Fe‐9Cr alloy migrated during annealing from room temperature to 573 K. The annealing temperature at 773 K produce aggregation of dislocations and the formation of dislocation networks, as well as their heterogeneous distribution. When the temperature is further increased to 1073 K, most of the vacancies and dislocations are recovered and a bcc‐fcc phase transmition occurred in Fe‐9Cr model alloy. The dislocation density is continuous decreased with the increase of annealing temperature, the recovery is obvious from 773 K annealing to 1073 K annealing in Fe‐9Cr alloy.

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Section: Resultsmentioning

confidence: 79%

Evolution of Thermally‐Induced Microstructural Defects in the Fe‐9Cr Alloy

Lian

Cao

Zhao

et al. 2017

Physica Status Solidi (a)

View full text Add to dashboard Cite

show abstract

“…All these samples were subjected to isochronal annealing treatment from 300 to 1323 K in steps of 50 K for 1hr in a vacuum of < 10 −6 Torr, followed by air cooling outside the furnace. Results of CW Fe were reported elsewhere 19 and those results are used here to compare with Fe-9Cr alloy.…”

Section: Methodsmentioning

confidence: 99%

“…In as prepared Fe-9Cr AQ sample (Fig-1(a)), lifetime of 130 ps shows quenched-in defects. Presence of chromium is responsible for these defects as they are absent in pure Fe 19 . The nature of defects responsible for this will be discussed with observations from transmission electron microscopy.…”

Section: Transmission Electron Microscopymentioning

confidence: 99%

“…Above 1185 K iron will get converted to FCC phase. Though there is structural phase transition from FCC to BCC in the cooling process, when the heat treatment temperature is beyond 1185 K, lifetime shows only marginal change from bulk value of BCC phase 19 . In as prepared Fe-9Cr AQ sample (Fig-1(a)), lifetime of 130 ps shows quenched-in defects.…”

Section: Transmission Electron Microscopymentioning

confidence: 99%

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