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Title: Influence of dislocation-solute interactions on the mechanical properties of zirconium-doped NiAl

Abstract

Atom probe field ion microscopy (APFIM) has been used to characterize NiAl microalloyed with molybdenum and zirconium. Field ion images and atom probe analyses revealed segregation of zirconium to dislocation strain fields and ribbon-like morphological features that are probably related to dislocations. These results provide direct experimental evidence in support of the suggestion that the tremendous increase in the ductile-to-brittle transition temperature (DBTI) in zirconium-doped NiAl is due to pinning of dislocations by zirconium atoms. Atom probe analyses also revealed segregation of zirconium to grain boundaries. This result is consistent with the change from an intergranular fracture mode in undoped NiAl to a mixture of intergranular and transgranular fracture mode in zirconium-doped NiAl. The NiAl matrix was severely depleted of the solutes molybdenum and zirconium. Small Mo-rich precipitates, detected in the matrix and grain boundaries, are likely to contribute to the significant increase in the room-temperature yield stress of microalloyed NiAl through a precipitation hardening mechanism.

Authors:
 [1];  [2]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  2. Oak Ridge National Lab., TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
35407
Report Number(s):
CONF-941144-101
ON: DE95008848; TRN: 95:003234
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Conference
Resource Relation:
Conference: Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 28 Nov - 9 Dec 1994; Other Information: PBD: [1995]
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NICKEL ALLOYS; MICROSTRUCTURE; CRYSTAL DOPING; ALUMINIUM ALLOYS; MOLYBDENUM; METALLURGICAL EFFECTS; ZIRCONIUM; ION MICROSCOPY; MORPHOLOGY; GRAIN BOUNDARIES; YIELD STRENGTH; STRAINS; DISLOCATIONS; MECHANICAL PROPERTIES; CRACK PROPAGATION; GRAIN SIZE

Citation Formats

Jayaram, R, and Miller, M K. Influence of dislocation-solute interactions on the mechanical properties of zirconium-doped NiAl. United States: N. p., 1995. Web.
Jayaram, R, & Miller, M K. Influence of dislocation-solute interactions on the mechanical properties of zirconium-doped NiAl. United States.
Jayaram, R, and Miller, M K. 1995. "Influence of dislocation-solute interactions on the mechanical properties of zirconium-doped NiAl". United States. https://www.osti.gov/servlets/purl/35407.
@article{osti_35407,
title = {Influence of dislocation-solute interactions on the mechanical properties of zirconium-doped NiAl},
author = {Jayaram, R and Miller, M K},
abstractNote = {Atom probe field ion microscopy (APFIM) has been used to characterize NiAl microalloyed with molybdenum and zirconium. Field ion images and atom probe analyses revealed segregation of zirconium to dislocation strain fields and ribbon-like morphological features that are probably related to dislocations. These results provide direct experimental evidence in support of the suggestion that the tremendous increase in the ductile-to-brittle transition temperature (DBTI) in zirconium-doped NiAl is due to pinning of dislocations by zirconium atoms. Atom probe analyses also revealed segregation of zirconium to grain boundaries. This result is consistent with the change from an intergranular fracture mode in undoped NiAl to a mixture of intergranular and transgranular fracture mode in zirconium-doped NiAl. The NiAl matrix was severely depleted of the solutes molybdenum and zirconium. Small Mo-rich precipitates, detected in the matrix and grain boundaries, are likely to contribute to the significant increase in the room-temperature yield stress of microalloyed NiAl through a precipitation hardening mechanism.},
doi = {},
url = {https://www.osti.gov/biblio/35407}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 1995},
month = {Wed Mar 01 00:00:00 EST 1995}
}

Conference:
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