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A lattice resolution study of the martensitic transformation of small iron particles in a copper matrix
Luleå tekniska universitet.
Luleå tekniska universitet.
Luleå tekniska universitet.
High Resolution Electron Microscope, University of Cambridge.
1985 (English)In: Acta Metallurgica, ISSN 0001-6160, Vol. 33, no 2, p. 317-328Article in journal (Refereed) Published
Abstract [en]

The martensitic transformation of small, fully coherent, gamma iron precipitates in an epsilon copper matrix, brought about by the bombardment of thin foils with argon ions, has been studied using lattice fringe imaging. It is found, in general, that only partial transformation of individual particles occurs, this corresponding to a simple homogeneous shear (a Bain strain). In addition, the transformation is limited to particles located within about two particle diameters of the foil surface. It is established that the mere presence of a Frank (or Shockley) loop in a particle, due to the bombardment, is insufficient to trigger the transformation. The implications of this result are discussed with reference to bulk martensite. In the present case, it is concluded that transformation may simply initiate at sites of local decohesion or microslip at the matrix/particle boundaries brought about by vacancy condensation following ion bombardment, these sites being most effective in the vicinity of free surfaces

Place, publisher, year, edition, pages
1985. Vol. 33, no 2, p. 317-328
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-5698DOI: 10.1016/0001-6160(85)90150-6ISI: A1985ADV6900018Scopus ID: 2-s2.0-0022011098Local ID: 3de9adf0-ec47-11dc-9508-000ea68e967bOAI: oai:DiVA.org:ltu-5698DiVA, id: diva2:978572
Note

Godkänd; 1985; 20080307 (cira)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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