Aging treatment is an effective method to adjust the microstructure of alloy and affect its properties.The microstructure of the Ni-Ti-La alloys was analyzed experimentally,the phase transformation behavior of the alloys was studied,and the Vickers hardness of the alloys was measured.The experimental results show that the Ti50Ni49.5La0.5 alloys are composed of NiTi matrix,NiLa precipitates and Ti2Ni precipitates after aging treatment,and the amounts of precipitates decrease with the increase of aging temperature.The alloys undergo one-step phase transformation B2↔B19'during heating and cooling,and the martensitic transformation starting temperature of the alloy increases with the increase of aging temperature.The hardness of the alloys decreases with the increase of aging temperature.The Ti49.5Ni50La0.5 alloys are composed of NiTi matrix and NiLa precipitates after aging treatment,and the amounts of precipitates increase with the increase of aging temperature;The alloys present one-step phase transformation B2↔B19'during heating and cooling,and the martensitic transformation starting temperature of alloy increases with the increase of aging temperature.The Vickers hardness of the alloys decreases with the increase of aging temperature.As can be seen from the results,aging treatment affects the microstructures of Ti50Ni49.5La0.5 alloys and Ti49.5Ni50La0.5 alloys,thus affecting the phase transformation behavior and mechanical properties of the alloys.
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