Enhancement of Shape Memory Properties through Precipitation Hardening in a Ti-Rich Ti-Ni-Pd High Temperature Shape Memory Alloy

Access this Article

Search this Article

Author(s)

Abstract

Effects of aging on martensitic transformation temperature, microstructure and shape memory characteristics were investigated for Ti<sub>50</sub>Ni<sub>20</sub>Pd<sub>30</sub> and Ti<sub>52</sub>Ni<sub>18</sub>Pd<sub>30</sub> alloys. There was no significant change in the microstructure and transformation temperature by aging, irrespective of aging temperature, in case of the Ti<sub>50</sub>Ni<sub>20</sub>Pd<sub>30</sub> alloy. On the other hand, fine Ti<sub>2</sub>Pd type precipitates were formed upon aging in the Ti<sub>52</sub>Ni<sub>18</sub>Pd<sub>30</sub> alloy within the aging temperature range of 673-1073 K. The transformation temperature of the Ti<sub>52</sub>Ni<sub>18</sub>Pd<sub>30</sub> alloy was sensitively dependent on the aging temperature. The Ti<sub>2</sub>Pd type nanoscaled precipitates were found to be very effective in enhancing the high temperature dimensional stability during shape memory cycling. Excellent shape memory properties with a large recovery strain and a small plastic strain even at 500 MPa were observed in the Ti<sub>52</sub>Ni<sub>18</sub>Pd<sub>30</sub> alloy solution treated and aged at lower temperatures of 673 and 773 K owing to the formation of fine and dense Ti<sub>2</sub>Pd type precipitates.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 57(3), 241-249, 2016

    The Japan Institute of Metals and Materials

Codes

  • NII Article ID (NAID)
    130005127302
  • NII NACSIS-CAT ID (NCID)
    AA1151294X
  • Text Lang
    ENG
  • ISSN
    1345-9678
  • NDL Article ID
    027194384
  • NDL Call No.
    Z53-J286
  • Data Source
    NDL  J-STAGE 
Page Top