TY - JOUR
T1 - In-situ transmission electron microscopy observation on the phase transformation of Ti-Nb-Sn shape memory alloys
AU - Semboshi, Satoshi
AU - Shirai, Takahiro
AU - Konno, Toyohiko J.
AU - Hanada, Shuji
N1 - Funding Information:
The authors are grateful to Professor N. Masahashi and Dr. H. Matsumoto, Institute for Materials Research, Tohoku University, and Professor S. Mori and Dr. H. Tsuda, Osaka Prefecture University, for useful discussions and comments. This work was supported by a Grant-in-Aid for Young Scientist (B) (17760583) from the Ministry of Education, Science and Culture, Japan, and by the Inamori Foundation; it was also supported partly by the Innovation Plaza Miyagi, Japan Science and Technology Agency.
PY - 2008
Y1 - 2008
N2 - The microstructural changes accompanied by phase transformation during heating and cooling of quenched (Ti-35 wt pct Nb)-0 to 6 wt pct Sn alloys have been investigated using in-situ transmission electron microscopy (TEM). Reversible transformation between orthorhombic α″ and body-centered-cubic (bcc) β phases occurs on heating and cooling between 300 and 423 K in quenched (Ti-35 wt pct Nb)-3 and 5 wt pct Sn alloys, which consists of α″ martensite in the β matrix with diffused scattering after quenching. On the other hand, the reversibility was not observed in (Ti-35 wt pct Nb)-0 and 3 wt pct Sn alloys heated to 523 K or in quenched (Ti-35 wt pct Nb)-6 wt pct Sn alloy. The former is explained by stabilization of β phase due to precipitation of isothermal ω phase, and the latter by suppression of α″ martensitic transformation. These results clearly show that the formation of α″ martensite and isothermal ω phases from the unstable α″ phase influences shape memory behaviors in Ti-Nb-Sn alloys.
AB - The microstructural changes accompanied by phase transformation during heating and cooling of quenched (Ti-35 wt pct Nb)-0 to 6 wt pct Sn alloys have been investigated using in-situ transmission electron microscopy (TEM). Reversible transformation between orthorhombic α″ and body-centered-cubic (bcc) β phases occurs on heating and cooling between 300 and 423 K in quenched (Ti-35 wt pct Nb)-3 and 5 wt pct Sn alloys, which consists of α″ martensite in the β matrix with diffused scattering after quenching. On the other hand, the reversibility was not observed in (Ti-35 wt pct Nb)-0 and 3 wt pct Sn alloys heated to 523 K or in quenched (Ti-35 wt pct Nb)-6 wt pct Sn alloy. The former is explained by stabilization of β phase due to precipitation of isothermal ω phase, and the latter by suppression of α″ martensitic transformation. These results clearly show that the formation of α″ martensite and isothermal ω phases from the unstable α″ phase influences shape memory behaviors in Ti-Nb-Sn alloys.
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U2 - 10.1007/s11661-008-9674-3
DO - 10.1007/s11661-008-9674-3
M3 - Article
AN - SCOPUS:55249107978
SN - 1073-5623
VL - 39
SP - 2820
EP - 2829
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 12
ER -