Improvement of high-temperature shape-memory effect by multi-component alloying for TIPD alloys

Hiromichi Matsuda, Hirotaka Sato, Masayuki Shimojo, Yoko Yamabe-Mitarai

研究成果: Article

抄録

The influence of multi-component alloying on the phase transformation and shape-memory effect was investigated to develop new high-temperature shape memory alloys (HT-SMAs). Four alloys®35Ti20Pd15Ni15Pt15Zr, 40Ti20Pd15Ni15Pt10Zr (high-entropy alloys, HEAs), 45Ti20Pd5Ni25Pt5Zr, and 45Ti20Pd10Ni20Pt5Zr (medium-entropy alloys, MEAs, at%)®were prepared. At room temperature, the B2 structure was stable in the HEAs, and no martensitic transformation (MT) was observed. However, in the MEAs, an MT from the B2 structure to a B19 structure was clearly observed. The MT temperature of the MEAs was comparable to or higher than those of binary and ternary TiPd alloys. The strengths of both the martensite and austenite phases in 45Ti20Pd5Ni25Pt5Zr were higher than those in 45Ti20Pd10Ni20Pt5Zr and ternary TiPd alloys. We attempted to explain the high strength using the ¤ parameter, which indicates the lattice distortion for various atomic sizes, but a clear correlation was not observed, as there were no significant differences in the ¤ parameter among the tested alloys. The shape recovery was investigated via a thermal cyclic test under an applied stress in the range of 15200 MPa. Although a small plastic strain was introduced during the thermal cyclic test, a shape recovery over 80% was obtained for both MEAs. Training, that is, the thermal cyclic test under the same applied stress, was conducted to investigate the change of the irrecoverable strain and the work output. For 45Ti20Pd5Ni25Pt5Zr, the irrecoverable strain was deleted after 50 cycles, and perfect recovery was obtained. The largest work output (3.5 J/cm3) was obtained under 200 MPa. In 45Ti20Pd10Ni20Pt5Zr, perfect recovery was obtained from the first cycle. However, the recoverable strain was small, and the largest work output was 1.5 J/cm3 under 200 MPa. The shape recovery of 45Ti20Pd5Ni25Pt5Zr is promising for new HT-SMAs compared with the ternary TiPdZr alloys and other HEA-SMAs.

元の言語English
ページ(範囲)2282-2291
ページ数10
ジャーナルMaterials Transactions
60
発行部数11
DOI
出版物ステータスPublished - 2019 1 1

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Shape memory effect
Alloying
alloying
recovery
Ternary alloys
ternary alloys
Martensitic transformations
martensitic transformation
Recovery
Entropy
entropy
heat resistant alloys
shape memory alloys
output
Temperature
spectral mixture analysis
cycles
austenite
high strength
martensite

ASJC Scopus subject areas

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

これを引用

Improvement of high-temperature shape-memory effect by multi-component alloying for TIPD alloys. / Matsuda, Hiromichi; Sato, Hirotaka; Shimojo, Masayuki; Yamabe-Mitarai, Yoko.

:: Materials Transactions, 巻 60, 番号 11, 01.01.2019, p. 2282-2291.

研究成果: Article

Matsuda, Hiromichi ; Sato, Hirotaka ; Shimojo, Masayuki ; Yamabe-Mitarai, Yoko. / Improvement of high-temperature shape-memory effect by multi-component alloying for TIPD alloys. :: Materials Transactions. 2019 ; 巻 60, 番号 11. pp. 2282-2291.
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abstract = "The influence of multi-component alloying on the phase transformation and shape-memory effect was investigated to develop new high-temperature shape memory alloys (HT-SMAs). Four alloys{\circledR}35Ti20Pd15Ni15Pt15Zr, 40Ti20Pd15Ni15Pt10Zr (high-entropy alloys, HEAs), 45Ti20Pd5Ni25Pt5Zr, and 45Ti20Pd10Ni20Pt5Zr (medium-entropy alloys, MEAs, at{\%}){\circledR}were prepared. At room temperature, the B2 structure was stable in the HEAs, and no martensitic transformation (MT) was observed. However, in the MEAs, an MT from the B2 structure to a B19 structure was clearly observed. The MT temperature of the MEAs was comparable to or higher than those of binary and ternary TiPd alloys. The strengths of both the martensite and austenite phases in 45Ti20Pd5Ni25Pt5Zr were higher than those in 45Ti20Pd10Ni20Pt5Zr and ternary TiPd alloys. We attempted to explain the high strength using the ¤ parameter, which indicates the lattice distortion for various atomic sizes, but a clear correlation was not observed, as there were no significant differences in the ¤ parameter among the tested alloys. The shape recovery was investigated via a thermal cyclic test under an applied stress in the range of 15200 MPa. Although a small plastic strain was introduced during the thermal cyclic test, a shape recovery over 80{\%} was obtained for both MEAs. Training, that is, the thermal cyclic test under the same applied stress, was conducted to investigate the change of the irrecoverable strain and the work output. For 45Ti20Pd5Ni25Pt5Zr, the irrecoverable strain was deleted after 50 cycles, and perfect recovery was obtained. The largest work output (3.5 J/cm3) was obtained under 200 MPa. In 45Ti20Pd10Ni20Pt5Zr, perfect recovery was obtained from the first cycle. However, the recoverable strain was small, and the largest work output was 1.5 J/cm3 under 200 MPa. The shape recovery of 45Ti20Pd5Ni25Pt5Zr is promising for new HT-SMAs compared with the ternary TiPdZr alloys and other HEA-SMAs.",
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AU - Matsuda, Hiromichi

AU - Sato, Hirotaka

AU - Shimojo, Masayuki

AU - Yamabe-Mitarai, Yoko

PY - 2019/1/1

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N2 - The influence of multi-component alloying on the phase transformation and shape-memory effect was investigated to develop new high-temperature shape memory alloys (HT-SMAs). Four alloys®35Ti20Pd15Ni15Pt15Zr, 40Ti20Pd15Ni15Pt10Zr (high-entropy alloys, HEAs), 45Ti20Pd5Ni25Pt5Zr, and 45Ti20Pd10Ni20Pt5Zr (medium-entropy alloys, MEAs, at%)®were prepared. At room temperature, the B2 structure was stable in the HEAs, and no martensitic transformation (MT) was observed. However, in the MEAs, an MT from the B2 structure to a B19 structure was clearly observed. The MT temperature of the MEAs was comparable to or higher than those of binary and ternary TiPd alloys. The strengths of both the martensite and austenite phases in 45Ti20Pd5Ni25Pt5Zr were higher than those in 45Ti20Pd10Ni20Pt5Zr and ternary TiPd alloys. We attempted to explain the high strength using the ¤ parameter, which indicates the lattice distortion for various atomic sizes, but a clear correlation was not observed, as there were no significant differences in the ¤ parameter among the tested alloys. The shape recovery was investigated via a thermal cyclic test under an applied stress in the range of 15200 MPa. Although a small plastic strain was introduced during the thermal cyclic test, a shape recovery over 80% was obtained for both MEAs. Training, that is, the thermal cyclic test under the same applied stress, was conducted to investigate the change of the irrecoverable strain and the work output. For 45Ti20Pd5Ni25Pt5Zr, the irrecoverable strain was deleted after 50 cycles, and perfect recovery was obtained. The largest work output (3.5 J/cm3) was obtained under 200 MPa. In 45Ti20Pd10Ni20Pt5Zr, perfect recovery was obtained from the first cycle. However, the recoverable strain was small, and the largest work output was 1.5 J/cm3 under 200 MPa. The shape recovery of 45Ti20Pd5Ni25Pt5Zr is promising for new HT-SMAs compared with the ternary TiPdZr alloys and other HEA-SMAs.

AB - The influence of multi-component alloying on the phase transformation and shape-memory effect was investigated to develop new high-temperature shape memory alloys (HT-SMAs). Four alloys®35Ti20Pd15Ni15Pt15Zr, 40Ti20Pd15Ni15Pt10Zr (high-entropy alloys, HEAs), 45Ti20Pd5Ni25Pt5Zr, and 45Ti20Pd10Ni20Pt5Zr (medium-entropy alloys, MEAs, at%)®were prepared. At room temperature, the B2 structure was stable in the HEAs, and no martensitic transformation (MT) was observed. However, in the MEAs, an MT from the B2 structure to a B19 structure was clearly observed. The MT temperature of the MEAs was comparable to or higher than those of binary and ternary TiPd alloys. The strengths of both the martensite and austenite phases in 45Ti20Pd5Ni25Pt5Zr were higher than those in 45Ti20Pd10Ni20Pt5Zr and ternary TiPd alloys. We attempted to explain the high strength using the ¤ parameter, which indicates the lattice distortion for various atomic sizes, but a clear correlation was not observed, as there were no significant differences in the ¤ parameter among the tested alloys. The shape recovery was investigated via a thermal cyclic test under an applied stress in the range of 15200 MPa. Although a small plastic strain was introduced during the thermal cyclic test, a shape recovery over 80% was obtained for both MEAs. Training, that is, the thermal cyclic test under the same applied stress, was conducted to investigate the change of the irrecoverable strain and the work output. For 45Ti20Pd5Ni25Pt5Zr, the irrecoverable strain was deleted after 50 cycles, and perfect recovery was obtained. The largest work output (3.5 J/cm3) was obtained under 200 MPa. In 45Ti20Pd10Ni20Pt5Zr, perfect recovery was obtained from the first cycle. However, the recoverable strain was small, and the largest work output was 1.5 J/cm3 under 200 MPa. The shape recovery of 45Ti20Pd5Ni25Pt5Zr is promising for new HT-SMAs compared with the ternary TiPdZr alloys and other HEA-SMAs.

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KW - Thermal cyclic test

KW - TiPd

KW - TiPt

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