Neutron diffraction study of the structure and low-temperature phase transformation in ternary NiAl+M (M = Ni, Fe, Co) alloys

Journal Article · Tue May 01 00:00:00 EDT 2007 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2006.12.043· OSTI ID:931906

Yang, Ling ^[1]; Wang, Xun-Li ^[1]; Liu, Chain T ^[1]; Fernandez-Baca, Jaime A ^[1]; Fu, Chong Long ^[1]; Richardson, James W ^[2]; Shi, Detang ^[1]

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1. ORNL
2. Argonne National Laboratory (ANL)

Neutron diffraction was used to study the structure of ternary NiAl + M (M = Ni, Fe, Cc) alloys. The experiment confirmed the predictions by first-principle calculations on site preference by solute atoms. Moreover, a universal structural transformation was observed below 20 K in alloys where Al is partially replaced by M. The extra peaks at low-temperatures do not match those from known martensite phases, but are well indexed by a cubic structure. A possible mechanism for the low-temperature phase is discussed. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 931906
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 10 Vol. 56; ISSN SCMAF7; ISSN 1359-6462
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
COBALT ALLOYS
IRON ALLOYS
NEUTRON DIFFRACTION
NICKEL ALLOYS
PHASE TRANSFORMATIONS