FIELD: metallurgy.
SUBSTANCE: method for treatment of single crystal of ferro-magnetic CoNiAl alloy with Ni content 33 -35 at % Al 29 -30 at % for introducing the two-way shape memory effect includes annealing of samples at +1330C÷1340°C for 8.5 hours in inert gas atmosphere followed by quenching in water and thermomechanical treatment. The thermomechanical treatment is carried out per heating/cooling cycle involving heating in free state of single crystal in the form of parallelepiped placed in the grippers of the test machine in planes (001)B2, (110)B2, 
up to 275°C, applying compressive load of 500 MPa along the crystallographic direction 
cooling under load to the temperature of 0÷-50°C until completion of thermoelastic B2-L10 martensitic transformation, heating to the temperature of 125°C for 1 hour in martensitic state and further heating to the temperature of 275°C to complete reverse martensitic transformation L10-B2 The load is then removed and cooled to room temperature. The heating/cooling rate during thermomechanical treatment is 5-7°C/min.
EFFECT: high cyclic stability of the two-sided shape memory effect when thermocycling in free state at room temperature.
1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| NICKEL MONOALUMINIDE BASE ALLOY WITH HIGH TEMPERATURE SHAPE MEMORY EFFECT HEAT TREATMENT METHOD | 2005 |
|
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| METHOD OF TEMPERATURE-DEFORMATION EFFECT ON TITANIUM-NICKEL ALLOYS WITH NICKEL CONTENT OF 49-51 at% WITH SHAPE MEMORY EFFECT | 2015 |
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| METHOD OF CONTROL OF ACTUATING MEMBER SHAPE | 2001 |
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| TREATMENT METHOD OF TITANIUM-NICKEL ALLOYS WITH NICKEL CONTENT OF 49-51 AT % WITH SHAPE MEMORY EFFECT AND REVERSIBLE SHAPE MEMORY EFFECT (VERSIONS) | 2011 |
|
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| THERMAL TREATMENT OF MONOCRYSTALS OF Fe-Ni-Co-Al-Ti FERROMAGNETIC ALLOY WITH SHAPE MEMORY EFFECT AND SUPERELASTICITY ORIENTED IN [001] DIRECTION AT STRETCHING STRAIN | 2013 |
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| METHOD OF DEFORMATION-THERMAL TREATMENT TO ESTABLISH FUNCTIONAL PROPERTIES OF MEDICAL CLIPPING DEVICE OF Ti-Ni ALLOY WITH SHAPE MEMORY | 2016 |
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