Influence of Fe Addition on Phase Transformation, Microstructure and Mechanical Property of Equiatomic NiTi Shape Memory Alloy

doi:10.1007/s40195-017-0584-5

Abstract

Abstract:

Based on equiatomic nickel and titanium, three kinds of NiTiFe alloys with a nominal chemical composition of Ni₄₉Ti₄₉Fe₂, Ni₄₈Ti₄₈Fe₄ and Ni₄₇Ti₄₇Fe₆ (at.%), respectively, have been designed to investigate the influence of the addition of Fe element on phase transformation, microstructure and mechanical property of equiatomic NiTi shape memory alloy. The microstructures of three kinds of NiTiFe alloys are characterized by the equiaxed grains instead of the dendrites. Consequently, some Ti₂Ni precipitates are found to distribute in the grains interior and at the grain boundaries. The content of Fe element has an important influence on mechanical property of NiTiFe alloy. With increasing content of Fe element, the strength of NiTiFe alloy increases substantially, but the plasticity decreases sharply. It can be concluded that precipitation strengthening and solution strengthening play a significant role in enhancing the strength of NiTiFe alloy. In the case of three NiTiFe alloys, neither martensitic transformation nor reverse transformation can be observed in the range from -150 to 150 °C. On the one hand, the phase transformation temperature is probably out of the scope of the present experimental temperature. On the other hand, the addition of Fe element probably suppresses first-order martensitic transformation or reverse transformation, and consequently the second-order-like phase transformation from an incommensurate stage to a commensurate stage can probably take place.

Key words: Shape memory alloy, Mechanical property, Microstructure, Phase transformation

Ya-Nan Zhao, Shu-Yong Jiang, Yan-Qiu Zhang, Yu-Long Liang. Influence of Fe Addition on Phase Transformation, Microstructure and Mechanical Property of Equiatomic NiTi Shape Memory Alloy[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(8): 762-770.

Figures/Tables 9

Fig. 1 DSC curves of Ni50Ti50 and NiTiFe alloys: a Ni50Ti50; b Ni49Ti49Fe2; c Ni48Ti48Fe4; d Ni47Ti47Fe6

Fig. 2 SEM micrographs of Ni50Ti50 and NiTiFe alloys: a Ni50Ti50; b Ni49Ti49Fe2; c Ni48Ti48Fe4; d Ni47Ti47Fe6

Fig. 3 XRD patterns of Ni50Ti50 and NiTiFe alloys: a Ni50Ti50; b Ni49Ti49Fe2; c Ni48Ti48Fe4; d Ni47Ti47Fe6

Fig. 4 TEM micrographs of Ni50Ti50 alloy: a bright field image; b SAED pattern from a showing the existence of B19′ martensite phase

Fig. 5 TEM micrographs of Ni49Ti49Fe2 alloy: a bright field image; b SAED pattern from a showing Ti2Ni precipitate in the B2 austenite matrix

Fig. 6 TEM micrographs of Ni48Ti48Fe4 alloy: a bright field image showing Ti2Ni precipitate at the grain boundary of the B2 austenite matrix; b SAED pattern of B2 austenite matrix from a; c SAED pattern of Ti2Ni precipitate from a

Fig. 7 TEM micrographs of Ni47Ti47Fe6 alloy: a bright field image showing B2 austenite matrix; b SAED pattern of B2 austenite matrix from a; c bright field image showing the existence of Ti2Ni precipitate; d SAED pattern of Ti2Ni precipitate from c

Fig. 8 Compressive stress-strain curves of Ni50Ti50 and NiTiFe alloys

Fig. 9 Fractographs of Ni50Ti50 and NiTiFe alloys: a Ni50Ti50; b Ni49Ti49Fe2; c Ni48Ti48Fe4; d Ni47Ti47Fe6

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