Влияние старения в мартенсите на ориентационную зависимость предела текучести B2-фазы и эффект памяти формы в монокристаллах сплава Ti-40Ni-10Cu

Abstract

For the [001]-and [-123] -oriented single crystals of the Ti–40Ni–10Cu alloy, it was shown for the first time that martensite ageing at 250 MPa leads to a strong orientation dependence of the B2-phase yield stress under tension, which is weakly manifested in the initial crystals. The maximum increase in the B2-phase yield stress by 350 MPa compared with the initial state was found in the [001]-oriented crystals. At external tensile stresses of 100 MPa, the shape memory effect in [001]-oriented crystals was 4±0.2% in the initial state and increased to 5±0.2% after martensite ageing, while in [-123] orientation, on the contrary, it decreased from 8.7±0.2% to 5.4±0.2%.