TY - JOUR
T1 - Microstructure and phase transformation behavior of a new high temperature NiTiHf-Ta shape memory alloy with excellent formability
AU - Prasad, R. V.S.
AU - Park, Chan Hee
AU - Kim, Seong Woong
AU - Hong, Jae Keun
AU - Yeom, Jong Taek
N1 - Funding Information:
This study was supported by a grant from the Industrial Strategic Technology Development Program (10042703) funded by the Ministry of Knowledge Economy (MKE), Republic of Korea. This study was also partially supported by an internal fund from the Korea Institute of Materials Science.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017
Y1 - 2017
N2 - Microstructure, mechanical properties as well as phase transformation behavior of newly developed Ni49Ti36Hf15-xTa(x=0, 3, 6, 9, 12)high temperature shape memory alloys has been investigated. Ni49Ti36Hf15alloy consists of (Ti,Hf)2Ni phase which is brittle and incoherent with the martensite matrix. However, addition of Ta in place of Hf suppresses the brittle (Ti,Hf)2Ni phase formation with white Ta rich phase. More than 70% reduction in area has been observed in Ta added Ni49Ti36Hf15high temperature shape memory alloys. The austenitic transformation temperature is well above 200 °C (473 K) for lower Ta concentrations with up to 6 at. %; however; at higher Ta concentrations (i.e. above 9 at. %) decreases significantly. Overall, the addition of Ta greatly influences the hot deformation behavior and high temperature shape memory properties of Ni49Ti36Hf15alloy. The present paper discusses the detailed investigation on Ni49Ti36Hf15-xTa(x=0, 3, 6, 9, 12)high temperature shape memory alloys.
AB - Microstructure, mechanical properties as well as phase transformation behavior of newly developed Ni49Ti36Hf15-xTa(x=0, 3, 6, 9, 12)high temperature shape memory alloys has been investigated. Ni49Ti36Hf15alloy consists of (Ti,Hf)2Ni phase which is brittle and incoherent with the martensite matrix. However, addition of Ta in place of Hf suppresses the brittle (Ti,Hf)2Ni phase formation with white Ta rich phase. More than 70% reduction in area has been observed in Ta added Ni49Ti36Hf15high temperature shape memory alloys. The austenitic transformation temperature is well above 200 °C (473 K) for lower Ta concentrations with up to 6 at. %; however; at higher Ta concentrations (i.e. above 9 at. %) decreases significantly. Overall, the addition of Ta greatly influences the hot deformation behavior and high temperature shape memory properties of Ni49Ti36Hf15alloy. The present paper discusses the detailed investigation on Ni49Ti36Hf15-xTa(x=0, 3, 6, 9, 12)high temperature shape memory alloys.
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U2 - 10.1016/j.jallcom.2016.12.129
DO - 10.1016/j.jallcom.2016.12.129
M3 - Article
AN - SCOPUS:85006757968
SN - 0925-8388
VL - 697
SP - 55
EP - 61
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -