Effects of Heating and Cooling Cycle on the Shape Memory and Mechanical Characteristics of Tape-shaped Shape Memory Alloy Element
-
- Nakagawa C.
- Graduate student of Environmental Engineering, The University of Kitakyushu
-
- Cho H.
- Faculty of Environmental Engineering, The University of Kitakyushu
Abstract
<p>A pulley-type SMA heat-engine using Ti-Ni shape memory alloy (SMA) driven by low-temperature waste heat energy was investigated. We have proposed and fabricated a pulley-type heat-engine using tape-shaped SMA element for the purpose of improving of the life span of pulley-type SMA heat-engine. However, shape memory and mechanical characteristics of SMA deteriorate with increasing number of thermal cycles. Therefore, effects of thermal cycling on the shape memory and mechanical characteristics of the tape-shaped SMA element are investigated in this study. The chemical composition of the specimen is Ti-45.0Ni-5.0Cu (at%), heat treatment condition is 673K for 3.6ks and the specimen is memorized horizontal shape. The number of thermal cycling (N) is varied from 0 to 105. Transformation temperatures are almost constant as the N increases to 1×103. However, each difference of transformation temperature (Ms-Mf and As-Af) decrease when the N is within a range of 5×103 to 1×104, above which it increases. Mechanical properties improve with increase of N when the N is up to 1×104, above which it deteriorates. Furthermore, 2-stage martensitic transformation appears when N is above 5×104. These tendencies are caused by the variation of dislocation density and residual martensitic phase with the increasing of N.</p>
Journal
-
- Transactions of the Materials Research Society of Japan
-
Transactions of the Materials Research Society of Japan 43 (1), 19-22, 2018
The Materials Research Society of Japan
- Tweet
Details 詳細情報について
-
- CRID
- 1390282680489289472
-
- NII Article ID
- 130006329948
-
- ISSN
- 21881650
- 13823469
-
- Text Lang
- en
-
- Data Source
-
- JaLC
- Crossref
- CiNii Articles
- KAKEN
-
- Abstract License Flag
- Disallowed