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Positron annihilation study of defects in martensite transformation of FeMn alloy
Author(s) -
Yang Qian,
Ruzhang Ma,
Yongshu He,
Maorong Huang,
Shoudan Liu
Publication year - 1987
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170221225
Subject(s) - nucleation , martensite , dislocation , materials science , condensed matter physics , alloy , crystallography , transformation (genetics) , partial dislocations , diffusionless transformation , annihilation , temperature cycling , thermal , metallurgy , thermodynamics , microstructure , chemistry , composite material , physics , biochemistry , quantum mechanics , gene
It has been observed that a small number of repetitions of the transformation by thermal cycling enhanced the formation of ϵ‐Martensite whereas a large number of repetitions of transformation decreased the amount of ϵ‐Martensite formed. PAT analysis and electron microscope show that a few repetitions of the transformation produced less defects, including vacancies and dislocations, whereas a large number of repetitions of transformation produced progressively more defects. The PAT analysis also shows that these accumulated defetcs are mainly dislocations, which form a network of dislocations or a Lomer‐Cottrell dislocation net. A small number of dislocations enhanced the nucleation of ϵ‐Martensite whereas a large number of dislocations prevented the nucleation. So the dislocations‐produced by cycling transformation thermally — has a great effect on the ϵ‐formation.
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