Dislocation Driven Chromium Precipitation in Fe-9Cr Binary Alloy: A   Positron Lifetime Study
  The influence of initial heat treatment on anomalous Cr precipitation within high temperature solubility region in 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 EDS analysis they are found to be Cr-enriched. The existence of dislocations is found to be responsible for Cr precipitation. 
S. Hari Babu, R. Rajaraman, G. Amarendra, R. Govindaraj, N. P. Lalla,   Arup Dasgupta, Gopal Bhalerao and C.S. Sundar
cond-mat.mtrl-sci