Details
| Original language | English |
|---|---|
| Pages (from-to) | 4867-4876 |
| Number of pages | 10 |
| Journal | Acta materialia |
| Volume | 55 |
| Issue number | 14 |
| Publication status | Published - Aug 2007 |
| Externally published | Yes |
Abstract
The strain-temperature response of Ni-Fe-Ga single crystals underscores the role of the inter-martensitic transformation in creating intersecting heating and cooling segments; the separation of these segments occurs due to irreversibilities at high stresses and at high temperatures. An ultra-narrow tensile (1 °C) and compressive (<10 °C) thermal hysteresis are observed for the A ⇌ 10M ⇌ 14M case, accompanied by a small stress hysteresis (<30 MPa) in compressive and tensile stress-strain responses. The hysteresis levels increase and the intersecting segments disappear at high stresses and at high temperatures. This paper reports the use of a thermo-mechanical formulation to rationalize the role of inter-martensitic transformations. Plotting the transformation stress as a function of temperature indicates that inter-martensitic transformations enable a very wide pseudoelastic temperature range, as high as 425 °C. The measured Clausius-Clapeyron curve slope in compression (2.75 MPa °C-1) is eight times the tensile slope (0.36 MPa °C-1); the higher slope is attributed to the predominance of A ⇌ L10 at high temperatures.
Keywords
- Compression, Hysteresis, Martensitic transformation, Metastable phases, Tension
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Polymers and Plastics
- Materials Science(all)
- Metals and Alloys
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In: Acta materialia, Vol. 55, No. 14, 08.2007, p. 4867-4876.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Inter-martensitic transitions in Ni-Fe-Ga single crystals
AU - Hamilton, R. F.
AU - Sehitoglu, H.
AU - Efstathiou, C.
AU - Maier, H. J.
N1 - Funding Information: The work was supported by a Grant CMS -0428428, the National Science Foundation, Division of Civil and Mechanical Systems. The single crystals were obtained from Prof. Y. Chumlyakov of Tomsk State University, Russia.
PY - 2007/8
Y1 - 2007/8
N2 - The strain-temperature response of Ni-Fe-Ga single crystals underscores the role of the inter-martensitic transformation in creating intersecting heating and cooling segments; the separation of these segments occurs due to irreversibilities at high stresses and at high temperatures. An ultra-narrow tensile (1 °C) and compressive (<10 °C) thermal hysteresis are observed for the A ⇌ 10M ⇌ 14M case, accompanied by a small stress hysteresis (<30 MPa) in compressive and tensile stress-strain responses. The hysteresis levels increase and the intersecting segments disappear at high stresses and at high temperatures. This paper reports the use of a thermo-mechanical formulation to rationalize the role of inter-martensitic transformations. Plotting the transformation stress as a function of temperature indicates that inter-martensitic transformations enable a very wide pseudoelastic temperature range, as high as 425 °C. The measured Clausius-Clapeyron curve slope in compression (2.75 MPa °C-1) is eight times the tensile slope (0.36 MPa °C-1); the higher slope is attributed to the predominance of A ⇌ L10 at high temperatures.
AB - The strain-temperature response of Ni-Fe-Ga single crystals underscores the role of the inter-martensitic transformation in creating intersecting heating and cooling segments; the separation of these segments occurs due to irreversibilities at high stresses and at high temperatures. An ultra-narrow tensile (1 °C) and compressive (<10 °C) thermal hysteresis are observed for the A ⇌ 10M ⇌ 14M case, accompanied by a small stress hysteresis (<30 MPa) in compressive and tensile stress-strain responses. The hysteresis levels increase and the intersecting segments disappear at high stresses and at high temperatures. This paper reports the use of a thermo-mechanical formulation to rationalize the role of inter-martensitic transformations. Plotting the transformation stress as a function of temperature indicates that inter-martensitic transformations enable a very wide pseudoelastic temperature range, as high as 425 °C. The measured Clausius-Clapeyron curve slope in compression (2.75 MPa °C-1) is eight times the tensile slope (0.36 MPa °C-1); the higher slope is attributed to the predominance of A ⇌ L10 at high temperatures.
KW - Compression
KW - Hysteresis
KW - Martensitic transformation
KW - Metastable phases
KW - Tension
UR - http://www.scopus.com/inward/record.url?scp=34447298121&partnerID=8YFLogxK
U2 - 10.1016/j.actamat.2007.05.003
DO - 10.1016/j.actamat.2007.05.003
M3 - Article
AN - SCOPUS:34447298121
VL - 55
SP - 4867
EP - 4876
JO - Acta materialia
JF - Acta materialia
SN - 1359-6454
IS - 14
ER -