Analysis of matrix and interfacial dislocations in the nickel base superalloy CMSX-4 after creep in [[bar 1]11] direction

Journal Article · Thu Dec 01 00:00:00 EST 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90060-4· OSTI ID:7156425

Voelkl, R; Glatzel, U; Feller-Kniepmeier, M ^[1]

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1. Technische Univ. Berlin (Germany). Inst. fuer Metallforschung

The creep anisotropy of the single crystal nickel base superalloy CMSX-4 in [001] and [111] direction has first been investigated by Caron and co-workers. Their results show that at 1,033 K under 750 MPa tensile load and a [gamma][prime] size of 340 nm, creep lives of [111] specimens are reduced as compared to [001] crystals. In the CMSX-2 superalloy, the creep anisotropy was found to be strongly influenced by the [gamma][prime] size. The glide systems in the [111] oriented superalloy CMSX-2 were analyzed to be octahedral with no cube slip. Neglecting coherency stresses, six [110] [111] glide systems are active in a [111] oriented samples with a Schmid factor of 0.27, while three [110] [001] systems have a Schmid factor of 0.47. Assuming equal Peierls stresses, cube slip should be favored as compared to octahedral slip in a [111] oriented sample. The authors intend to analyze matrix and interfacial dislocations after creep of CMSX-4 in order to determine glide mechanisms that are active in an early stage of creep.

• OSTI ID: 7156425
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 31:11; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL BASE ALLOYS
CREEP
DISLOCATIONS
DEFORMATION
EXPERIMENTAL DATA
HEAT RESISTING ALLOYS
PEIERLS-NABARRO FORCE
SLIP
ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
HEAT RESISTANT MATERIALS
INFORMATION
LINE DEFECTS
MATERIALS
MECHANICAL PROPERTIES
NICKEL ALLOYS
NUMERICAL DATA
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies