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In‐situ Observations on Cu‐SiO 2 and Stainless Steels
Author(s) -
Brooks J. W.,
Haque E.,
Loretto M. H.,
Smallman R. E.
Publication year - 1979
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19790141105
Subject(s) - martensite , materials science , dislocation , metallurgy , deformation (meteorology) , crystallography , composite material , microstructure , chemistry
Specimens of CuSiO 2 and of several high purity stainless steels have been observed during deformation in an HVEM. The behaviour of the CuSiO 2 specimens is dominated by the free surfaces, even in the thickest regions which can be examined, but in the stainless steels it has been found that if the specimen is thicker than about 0.5 μm, bulk behaviour is observed. The formation of ϵ‐ and α‐martensite has been directly observed and essentially identical observations of martensite formation have been made during cooling. It has been shown that ϵ‐martensite is always formed in regions where appropriately, but usually irregularly spaced faults, are generated and detailed analyses of isolated and overlapping faults show that these faults contain close‐packed planes of the appropriate eph spacing. α‐martensite is formed in association with dislocation pile‐ups.