Training effect on microstructure and shape recovery in Ti-Pd-Zr alloys

Hirotaka Sato, Hee Young Kim, Masayuki Shimojo, Yoko Yamabe-Mitarai

Research output: Contribution to journalArticle

Abstract

The training effect of microstructure and shape recovery on Ti-50Pd-xZr (x = 7 and 10) at% and Ti-50Pd-xZr-(5-x)V (x = 1, 2.5, and 4) high-temperature shape memory alloys were investigated. Zr was selected as an alloying element as it is known to improve the shape recovery of TiPd. As a further alloying element, V was selected because it is effective in strengthening TiPd. The dependence of Zr content and V addition on the martensitic transformation (MT) temperature, shape recovery, and training effect were investigated. For example, Mf, decreased with increasing Zr from 480°C in Ti-50Pd to 302°C in Ti-50Pd-10Zr. In Ti-50Pd-xZr-(5-x)V, when the total amount of Zr and V was 5 at%, the MT temperatures did not change drastically. The MT temperatures ranged between 350 and 550°C. Shape recovery was investigated using the thermal cyclic test under a constant applied stress in the range of 15 to 200 MPa. Perfect recovery was obtained at low stresses, while irrecoverable strain was observed at high stresses. For Ti-50Pd-2.5Zr-2.5V and Ti-50Pd-1Zr-4V, creep deformation was observed above 150 MPa. To obtain perfect recovery, training (repeated thermal cyclic tests under a constant applied stress) was performed. Perfect recovery was obtained for the alloys by training, except for Ti-50Pd-4Zr-1V. Ti-50Pd-10Zr achieved perfect recovery up to 200 MPa, while Ti-50Pd-1Zr-4V achieved perfect recovery up to 150 MPa. Other alloys achieved perfect recovery at lower stresses of 65 or 50 MPa. The microstructure changed from a random martensite variant to a specific orientation during training, to accommodate the large strain during deformation. It was found that a strong texture led to perfect shape recovery.

LanguageEnglish
Pages1479-1486
Number of pages8
JournalMaterials Transactions
Volume58
Issue number10
DOIs
StatePublished - 2017

Fingerprint

education
recovery
Recovery
microstructure
Microstructure
Martensitic transformations
martensitic transformation
Alloying elements
alloying
Temperature
heat resistant alloys
shape memory alloys
martensite
Shape memory effect
Martensite
temperature
Creep
textures
Textures

Keywords

  • B19
  • B2
  • High-temperature shape memory alloys
  • Shape recovery
  • Thermomechanical test
  • TiPd

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Training effect on microstructure and shape recovery in Ti-Pd-Zr alloys. / Sato, Hirotaka; Kim, Hee Young; Shimojo, Masayuki; Yamabe-Mitarai, Yoko.

In: Materials Transactions, Vol. 58, No. 10, 2017, p. 1479-1486.

Research output: Contribution to journalArticle

Sato, Hirotaka ; Kim, Hee Young ; Shimojo, Masayuki ; Yamabe-Mitarai, Yoko. / Training effect on microstructure and shape recovery in Ti-Pd-Zr alloys. In: Materials Transactions. 2017 ; Vol. 58, No. 10. pp. 1479-1486
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