Deformation-induced pseudo-twinning and a new superstructure in Ni{sub 2}Mo precipitates contained in a Ni-25Mo-8Cr alloy

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Acta Materialia

DOI:https://doi.org/10.1016/1359-6454(96)00005-5· OSTI ID:389809

Kumar, M; Vasudevan, V K ^[1]

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1. Univ. of Cincinnati, OH (United States). Dept. of Materials Science and Engineering

Deformation twinning in a two-phase Ni-25Mo-8Cr (in wt%) alloy containing Ni{sub 2}(Mo,Cr) precipitates in a face centered cubic matrix has been studied by transmission electron microscopy. It has been found that the normal twinning variant in the disordered face centered cubic matrix phase which corresponds to the pseudo-twinning mode in the ordered body centered orthorhombic Ni{sub 2}Mo phase changes the atomic arrangement (nearest neighbor environment) such that a new superstructure (called the {mu} phase) with tetragonal symmetry is produced in the twinned regions of the Ni{sub 2}Mo precipitates. Experimental electron diffraction evidence obtained across this pseudo-twinned structure has been correlated with the associated crystallography of the phases and a discussion based on these analytical correlations is presented.

• OSTI ID: 389809
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 9 Vol. 44; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
CORRELATIONS
CRYSTALLOGRAPHY
DEFORMATION
ELECTRON DIFFRACTION
FCC LATTICES
INTERMETALLIC COMPOUNDS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
TWINNING