Abstract. The methods of electron microscopy, resistometry and magnetometry are used to study ten (36-38)Co − (32-36)Ni − (27-30)Al (at. %) alloys. Cast coarse-crystalline and microcrystalline alloys made by melt spinning in a helium atmosphere are considered. It is shown that the martensite start temperature M s becomes 30-50°C lower as grains are refined to 1 µ m. Replacement of 1 at. % cobalt by nickel and 1 at. % aluminum by nickel makes the temperature interval of the В2 ↔ L1 0 martensite transformation (30-60)°C and (100-110)°C higher respectively. The martensite transformation hysteresis is about 100 degrees. The melt-spun Co 38 Ni 34 Al 28 alloy with the transformation temperatures М s = 31°С, М f = -34°С, А s = -6°С, А f = 70°С and Т с = 98°С is a material possessing the magnetically controlled shape memory effect.
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