Influence of Al grain boundaries segregations and La-doping on embrittlement of intermetallic NiAl

Anatoly I. Kovalev, Dmitry L. Wainstein, Alexander Yu Rashkovskiy

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The microscopic nature of intergranular fracture of NiAl was experimentally investigated by the set of electron spectroscopy techniques. The paper demonstrates that embrittlement of NiAl intermetallic compound is caused by ordering of atomic structure that leads to formation of structural aluminum segregations at grain boundaries (GB). Such segregations contain high number of brittle covalent interatomic bonds. The alloying by La increases the ductility of material avoiding Al GB enrichment and disordering GB atomic structure. The influence of La alloying on NiAl mechanical properties was investigated. GB chemical composition, atomic and electronic structure transformations after La doping were investigated by AES, XPS and EELFS techniques. To qualify the interatomic bonds metallicity the Fermi level (E F ) position and electrons density (n eff ) in conduction band were determined in both undoped and doped NiAl. Basing on experimental results the physical model of GB brittleness formation was proposed.

Original languageEnglish
Pages (from-to)323-327
Number of pages5
JournalApplied Surface Science
StatePublished - 1 Nov 2015
Externally publishedYes


  • AES
  • Al segregations
  • Brittle crack nucleation
  • Electronic structure
  • La doping
  • NiAl
  • XPS

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


Dive into the research topics of 'Influence of Al grain boundaries segregations and La-doping on embrittlement of intermetallic NiAl'. Together they form a unique fingerprint.

Cite this