Transformation And Deformation Characteristics Of Ti49.4ni50.6 Superelastic Spring

Acta Metall Sin

2004, Vol. 40

Issue (1): 46-50 DOI:

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Transformation And Deformation Characteristics Of Ti49.4ni50.6 Superelastic Spring

HE Zhirong; ZHANG Yonghong;WANG Yongshan

State Key Laboratory for Mechanical Behavior of Materials; Xi'an Jiaotong University

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HE Zhirong; ZHANG Yonghong; WANG Yongshan. Transformation And Deformation Characteristics Of Ti49.4ni50.6 Superelastic Spring. Acta Metall Sin, 2004, 40(1): 46-50 .

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Abstract Effects of the annealing and deforming temperatures, thermal cycle, and the stress--strain cycle on the transformation and deformation characteristics of Ti49.4Ni50.6 superelastic (SE) coil spring have been investigated by means of differential scanning calorimetry, tensile test, and stress--strain cycling test. The phase--transformed type of the cold worked plus intermediate temperature annealed TiNi alloy is parent phase B2 rightleftharpoons R phase rightleftharpoons martensite B19'during cooling rightleftharpoons heating cycle. The martensitic transformationtemperatures increase and the R--phase transformationtemperatures decrease with increasing the annealingtemperature. The SE property can be obtained at roomtemperature for the 623---773 K annealing Ti49.4Ni50.6alloy spring, and the rigidity of the SE spring increaseswith increasing the deformed temperature. The SE propertyof Ti49.4Ni50.6alloy spring weakens while theannealed temperature is over 823 K. The smaller the takenshear strain, the higher the strain recovery rate ofTiNi SE spring is during the thermal cycle. The priorcyclic training can enhance the SE stability of TiNi

Key words: TiNi shape memory alloy superelastic spring

Received: 24 December 2002

ZTFLH:

TG113.25

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2004/V40/I1/46

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