Journal
ACTA MATERIALIA
Volume 56, Issue 17, Pages 4789-4797Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.05.034
Keywords
Nickel alloys; Heusler phases; Order-disorder phenomena; Magnetic properties; Microstructure
Funding
- Ministry of Education, Science, Sports and Culture, Japan
- Japan Science and Technology Agency (JST)
- apan Society for the Promotion of Science (JSPS) [18106012]
- Grants-in-Aid for Scientific Research [18106012] Funding Source: KAKEN
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The phase stability and magnetic properties of Ni2Mn(GaxAl1-x) alloys were studied by differential scanning calorimetric and magnetometric measurements, and X-ray diffraction and transmission electronic microscopic observations. The order-disorder transition temperature from the B2 to the L2(1) phase, T-t(B2/L21), linearly increases with increasing x and the magnetic properties depend on the annealing conditions. Especially in the Ni2Mn(Ga0.5Al0.5) alloy, the condition of the atomic order can be varied from a B2 to an L2(1) structure by the annealing temperature. The magnetic property of the fully ordered L2(1) phase is ferromagnetic with a Curie temperature T-C of about 380 K, while that in the B2 phase is antiferromagnetic with the Neel temperature T-N of about 300 K. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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