The Martensite formed at low temperatures in Fe-Ni-Co-Ti alloys is featured as thin plate when the size of γ' dispersively precipitated particles was about 20—50 nm.The interface of martensite plate is not smooth.If the γ'particles are sized less than 5 nm,the thin plate martensite with thermoelastisity may be found at low temperatures,whi greater than 5 nm, intermittent martensite may occur,and the plate martensite increases both in size and quantity with the coarsening of the γ particles.The lenticular or butterfly martensite forms at low tem- peratures until the γ' particles are up to 10—5 nm.
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