The concentrations of quenched‐in vacancies in Fe‐Al and Fe‐Al‐Cr systems after their various thermal treatment were studied by positron lifetime spectroscopy. The experimental data were analyzed with the 2‐state trapping model directly implemented to the code of the computer program (LT‐9 2). The number of quenched‐in vacancies strongly depends on the rate of quenching. For fast quenched samples the atomic concentration is of order of 10–4 and it radically falls after annealing at 500 °C for 0.5 h. A comparison of Fe28Al and Fe28Al5Cr samples, after analogical heat treatment, showed that chromium addition caused a systematical decrease of the resistant vacancy concentrations. In the samples that were slowly cooled after quenching at 1000 °C the positrons are trapped at precipitates of minor alloying elements. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
No takes yet. Share an insight, caveat, or question.
Kansy et al. (2009) studied this question.