Constant-Strain Thermal Cycling of a Ni50.3Ti29.7Hf20 High-Temperature Shape Memory Alloy
The effect of various pre-straining routines on the recovery stresses of a Ni-rich Ni 50.3 Ti 29.7 Hf 20 high-temperature shape memory alloy was investigated in tension and compression. The recovery stresses, obtained by means of constant-strain thermal cycling, were evaluated after isothermal (up t...
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Published in | Shape memory and superelasticity : advances in science and technology Vol. 2; no. 2; pp. 218 - 227 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Cham
Springer International Publishing
01.06.2016
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | The effect of various pre-straining routines on the recovery stresses of a Ni-rich Ni
50.3
Ti
29.7
Hf
20
high-temperature shape memory alloy was investigated in tension and compression. The recovery stresses, obtained by means of constant-strain thermal cycling, were evaluated after isothermal (up to ±2 % applied strain at room temperature) or after isobaric thermal cycling at stress levels between ±100 and 400 MPa. The material exhibited high force generation capability with recovery stresses of nearly 1.5 GPa on the first cycle under particular pre-strain conditions. The recovery stresses are shown to decay during subsequent cycles using an upper cycle temperature of 300 °C with a saturated stress level nearing 1.1 GPa in compression. |
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ISSN: | 2199-384X 2199-3858 |
DOI: | 10.1007/s40830-016-0068-x |