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Formation of Ni2Al and Ni5Al3 superstructures and reversibility of martensitic transformation in NiAl-based β-alloys

✍ Scribed by N.V. Kataeva; S.V. Kositsyn; A.I. Valiullin

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
106 KB
Volume
438-440
Category
Article
ISSN
0921-5093

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✦ Synopsis

Rapidly crystallized NiAl-based ␤-alloys -Ni 64 Al 36 , Ni 65 Al 35 , and Ni 56 Al 34 Co 10 (at.%) -were studied by methods of resistometry and electron microscopy. The decomposition of the L1 0 -martensite, which was accompanied by formation of Ni 5 Al 3 particles, was observed in alloys whose reverse martensite start temperature was over 250 • C. Formation of nanoparticles with the A 5 B 3 (Ni 5 Al 3 ) superstructure in the martensite stabilized it against the reverse shear transformation up to a complete suppression of the thermoelastic ␤(B2) ↔ L1 0 transformation. The replacement of nickel by 10 at.% cobalt in the Ni 66 Al 34 alloy decreased the tendency to the formation of Ni 5 Al 3 and Ni 2 Al particles.

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