TY - GEN
T1 - Martensitic transformation of high-entropy and medium-entropy shape memory alloys
AU - Matsuda, Hiromichi
AU - Shimojo, Masayuki
AU - Murakami, Hideyuki
AU - Yamabe-Mitarai, Yoko
N1 - Funding Information:
The study was partly supported by “Precious Metals Research Grant of TANAKA Memorial Foundation”, for which the authors express thanks.
Publisher Copyright:
© 2021 Trans Tech Publications Ltd, Switzerland.
PY - 2021
Y1 - 2021
N2 - As new generation of high-temperature shape memory alloys, high-entropy alloys (HEAs) have been attracted for strong solid-solution hardened alloys due to their severe lattice distortion and sluggish diffusion. TiPd is the one potential high-temperature shape memory alloys because of its high martensitic transformation temperature above 500 °C. As constituent elements, Zr expected solid-solution hardening, Pt expected increase of transformation temperature, Au expected keeping transformation temperature, and Co expected not to form harmful phase. By changing the alloy composition slightly, two HEAs and two medium entropy alloys (MEAs) were prepared. Only two MEAs, Ti45Zr5Pd25Pt20Au5, and Ti45Zr5Pd25Pt20Co5 had the martensitic transformation. The perfect recovery was obtained in Ti45Zr5Pd25Pt20Co5 during the repeated thermal cyclic test, training, under 200 MPa. On the other hand, the small irrecoverable strain was remained in Ti45Zr5Pd25Pt20Au5 during the training under 150 MPa because of the small solid-solution hardening effect. It indicates that Ti45Zr5Pd25Pt20Co5 is the one possible HT-SMA working between 342 and 450 °C.
AB - As new generation of high-temperature shape memory alloys, high-entropy alloys (HEAs) have been attracted for strong solid-solution hardened alloys due to their severe lattice distortion and sluggish diffusion. TiPd is the one potential high-temperature shape memory alloys because of its high martensitic transformation temperature above 500 °C. As constituent elements, Zr expected solid-solution hardening, Pt expected increase of transformation temperature, Au expected keeping transformation temperature, and Co expected not to form harmful phase. By changing the alloy composition slightly, two HEAs and two medium entropy alloys (MEAs) were prepared. Only two MEAs, Ti45Zr5Pd25Pt20Au5, and Ti45Zr5Pd25Pt20Co5 had the martensitic transformation. The perfect recovery was obtained in Ti45Zr5Pd25Pt20Co5 during the repeated thermal cyclic test, training, under 200 MPa. On the other hand, the small irrecoverable strain was remained in Ti45Zr5Pd25Pt20Au5 during the training under 150 MPa because of the small solid-solution hardening effect. It indicates that Ti45Zr5Pd25Pt20Co5 is the one possible HT-SMA working between 342 and 450 °C.
KW - B19
KW - B2
KW - High-entropy alloy
KW - High-temperature shape memory alloy
KW - Martensitic transformation
KW - Multi-component alloy
KW - Shape recovery
KW - Thermomechanical test
UR - http://www.scopus.com/inward/record.url?scp=85096227491&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85096227491&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.1016.1802
DO - 10.4028/www.scientific.net/MSF.1016.1802
M3 - Conference contribution
AN - SCOPUS:85096227491
SN - 9783035736304
T3 - Materials Science Forum
SP - 1802
EP - 1810
BT - THERMEC 2021 - International Conference on Processing and Manufacturing of Advanced Materials Processing, Fabrication, Properties, Applications
A2 - Ionescu, Mihail
A2 - Sommitsch, Christof
A2 - Poletti, Cecilia
A2 - Kozeschnik, Ernst
A2 - Chandra, Tara
PB - Trans Tech Publications Ltd
T2 - International Conference on Processing and Manufacturing of Advanced Materials Processing, Fabrication, Properties, Applications, THERMEC 2021
Y2 - 10 May 2021 through 14 May 2021
ER -