14M MARTENSITE FORMATION IN MICROCRYSTALLINE NI-AL ALLOYS


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Abstract

Ni-Al alloys are considered the materials with high-temperature shape memory effect. However, being in coarse-crystalline state, Ni-Al alloys have low ductility. By performing grain refinement, it is possible to improve the alloys ductility. For example, it is possible to use the ultrarapid crystallization on revolving drum. The grain refinement will cause the structure dispersion.

In this paper, the authors made an attempt to detect a 14M martensite in Ni-Al alloys - Ni62,5Al37,5, Ni­­64Al36, Ni­­65Al35 and Ni56Al34Co10 (at. %) - produced by melt spinning on the revolving steel drum.

Tape samples having thickness of 30 µm and the grain-size of 0,5–4 µm were produced in the result of rapid crystallization. Using the resistometric measurement, the authors determined the temperatures of the direct and the reverse martensitic transformations in all alloys under examination. The authors could determine the martensitic transformation temperatures in Ni­­65Al35 and Ni56Al34Co10 alloys only with the help of rapid heat at the rate of 75 ºС/min, as during the slow heat at the rate of 1–5 ºС/min the maraging with the А5В3(Ni5Al­3) type phase takes place, which causes the loss of martensitic transformation reversibility. The alloys’ structure is studied with the help of transmission electron microscopy. At room temperature, Ni­­62,5Al37,5 alloy stays in metastable austenitic condition with B2 lattice and Ni­­64Al36, Ni65Al35 and Ni56Al34Co10 alloys go through martensitic transformation. The structure in Ni65Al35 and Ni56Al34Co10 alloys consists of plate martensite depleted of inner fine-scale twinning, whilst the Ni­­64Al36 alloy structure consists of thin-plate martensite and retained austenite. According to the microdiffraction data, martensite in three alloys is recognized as martensite with L10 lattice. Using the radiographic analysis, the authors determined in Ni­­64Al36 and Ni­­65Al35 alloys a small amount of 14M martensite as well as the major martensitic L10 phase and the retained austenite.

About the authors

Andrei Ildarovich Valiullin

M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg

Author for correspondence.
Email: a_valiullin@mail.ru.ru

researcher

Russian Federation

Viktor Vladimirovich Sagaradze

M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg

Email: vsagaradze@imp.uran.ru

corresponding member, Doctor of Sciences (Engineering), Professor, chief researcher, research head of department of Mechanical properties of metals

Russian Federation

Natalia Vadimovna Kataeva

M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg

Email: kataeva@imp.uran.ru

PhD (Engineering), senior researcher

Russian Federation

Vladimir Ivanovich Voronin

M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg

Email: voronin@imp.uran.ru

PhD (Physics and Mathematics), senior researcher

Russian Federation

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