Microstructure of INCOLOY MA956 after low and high temperature deformation

Journal Article · Wed Oct 15 00:00:00 EDT 1997 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(97)00224-8· OSTI ID:540907

Dubiel, B; Wrobel, M; Czyrska-Filemonowicz, A ^[1]; Ennis, P J ^[2]

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1. Univ. of Mining and Metallurgy, Krakow (Poland). Faculty of Metallurgy and Materials Science
2. Research Centre Juelich (Germany). Inst. for Materials in Energy Systems 1

INCOLOY alloy MA956 is an Fe20Cr5A10.5Y{sub 2}O{sub 3} alloy produced by the mechanical alloying process which provides a fine dispersion of the yttrium oxide phase in the ferritic Fe-Cr-Al matrix. The alloy exhibits outstanding strength and corrosion resistance at temperatures even above 1,000 C. Calculations based on the difference in the elastic moduli of the oxide particles (dispersoids) and the ferritic matrix led to the conclusion that the repulsive dislocation-dispersoid interaction can be the source of the strengthening due to Orowan bowing of dislocations between particles. However, after high temperature deformation an attractive interaction between dislocations and hard incoherent oxide particles has been observed. The aim of the present investigations was to reveal the nature of interaction between dispersoids and dislocations developed in INCOLOY MA956 during plastic deformation performed at systematically varied temperatures up to 950 C. An intention of such investigations was improving the understanding of the deformation mechanisms in ferritic ODS alloys.

• OSTI ID: 540907
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 8 Vol. 37; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
DEFORMATION
DISLOCATIONS
IRON BASE ALLOYS
MICROSTRUCTURE
PARTICULATES
SAMPLE PREPARATION
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
YTTRIUM ADDITIONS