TiNiFeNb形状记忆合金的组织结构及相变特性

Abstract

Abstract: A series of quaternary shape memory alloys Ti₄₉Ni_50-XFe_XNb₁ (at%) are prepared by adding elements Fe and Nb into alloys Ti₅₀Ni₅₀. The microstructure morphology and phase transition behavior of these alloys are studied systematically by X-ray diffraction, backscattered electron and electrical resistance measurements. It is shown that the addition of Nb does not change the phase structure of alloy TiNiFe (B2) and it just causes a tiny quantity of Nb-rich phase to precipitate in the matrix. However, the Nb addition inhibits the appearance of the R-phase in the process of phase transformation. With the increase of Fe content from 1 at% to 3 at%, the martensitic transformation temperature decreases rapidly from 273.7 K to 137.2 K. In addition,shape memory alloys Ti₄₉Ni₄₇Fe₃Nb₁ exhibites good shape memory effect and its strain recovery rate reaches 92.66% after a pre-strain of 8%.

Key words: shape memory alloys, Ti₄₉Ni_50-XFe_XNb₁, microstructure, transformation behavior, shape memory effect

CLC Number:

V252
TG139.6

HU Ning, LIU Fushun. Microstructure and Transformation Behavior of TiNiFeNb Shape Memory Alloys[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2011, 32(5): 948-952.

References

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Microstructure and Transformation Behavior of TiNiFeNb Shape Memory Alloys

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