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Effect of heat treatment and cyclic strain on shape memory behaviors of TiNiZr alloy
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School of Materials Science and Engineering,Shaanxi University of Technology

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TG113.25

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    Abstract:

    The effects of annealing processes, aging processes and cyclic strain on shape memory behaviors of Ti-50.8Ni-0.1Zr alloy were investigated by tensile test, optical microscopy and TEM. The alloys annealed at 350~400 ℃ and 600~700 ℃ present superelasticity (SE), the alloys annealed at 450~550 ℃ present shape memory effect (SME), the alloys aged at 300 ℃ for 1~50 h and at 400 ℃ for 1 h present SE, and the alloys aged at 400 ℃ for 5~50 h and 500 ℃ for 1~50 h present SME. With increasing annealing temperature, the platform stress (σM) of the stress-strain curve in the alloy decreases firstly and then increases, and the minimum 200 MPa obtained in the alloy annealed at 500 ℃; the residual strain (εR) increases firstly and then decreases, and the maximum 2.64% obtained in the alloy annealed at 500 ℃. With increasing aging time, the σM decreases, and the εR is small in the alloy aged at 300 ℃; the σM decreases, and the εR increases firstly and then tends to stable in the alloy aged at 400 ℃ and 500 ℃. With increasing stress-strain cycle number, the superelasticity type alloy transforms from incompletely nonlinear superelasticity to completely nonlinear superelasticity, and the σM and energy dissipation (△W) decrease firstly and then tend to stable; the σM and △W decrease firstly and then tend to stable in shape memory effect type alloy.

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[HE Zhi-rong, YE Jun-jie, ZHANG Kun-gang, DU Yu-qing. Effect of heat treatment and cyclic strain on shape memory behaviors of TiNiZr alloy[J]. Rare Metal Materials and Engineering,2021,50(8):2941~2949.]
DOI:10.12442/j. issn.1002-185X.20200674

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History
  • Received:September 06,2020
  • Revised:October 10,2020
  • Adopted:October 21,2020
  • Online: September 07,2021
  • Published: August 31,2021