Details
| Original language | English |
|---|---|
| Pages (from-to) | 7628-7635 |
| Number of pages | 8 |
| Journal | Materials Science and Engineering A |
| Volume | 528 |
| Issue number | 25-26 |
| Publication status | Published - 25 Sept 2011 |
| Externally published | Yes |
Abstract
Severe plastic deformation of Ti74Nb26 shape memory alloy was conducted successfully at room temperature using equal channel angular extrusion (ECAE). In conjunction with short post-extrusion heat treatments, ECAE improved the maximum transformation strain of the alloy from 1% to 1.7%. Moreover, it drastically reduced the irrecoverable strain during constant-stress thermal cycling experiments. After identical heat treatments, the specimens processed by one pass ECAE possess both higher transformation strain and higher irrecoverable strain as compared to those processed by four pass ECAE. However, the difference between the crystallographic texture contributions to the transformation strains of these specimens was minimal, and thus, the shape memory characteristics are believed to be influenced mainly by microstructural features. High dislocation density, small grain size, and precipitation of the omega phase were found to reduce not only the irrecoverable strain, but also the transformation strain.
Keywords
- Beta titanium alloys, Crystallographic texture, Equal channel angular processing, Martensitic transformation, Shape memory alloys
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Materials Science and Engineering A, Vol. 528, No. 25-26, 25.09.2011, p. 7628-7635.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Severe plastic deformation of Ti74Nb26 shape memory alloys
AU - Ma, J.
AU - Karaman, I.
AU - Kockar, B.
AU - Maier, H. J.
AU - Chumlyakov, Y. I.
N1 - Funding information: This work was supported by National Science Foundation – Division of Chemical, Bioengineering, Environmental, and Transport Systems – Bioengineering Program , grant no. 0731133 . The research also benefited from the support of National Science Foundation – International Materials Institute Program through the grant no. DMR 08-44082 , Office of Specific Programs, Division of Materials Research, Arlington, Virginia and Deutsche Forschungsgemeinschaft.
PY - 2011/9/25
Y1 - 2011/9/25
N2 - Severe plastic deformation of Ti74Nb26 shape memory alloy was conducted successfully at room temperature using equal channel angular extrusion (ECAE). In conjunction with short post-extrusion heat treatments, ECAE improved the maximum transformation strain of the alloy from 1% to 1.7%. Moreover, it drastically reduced the irrecoverable strain during constant-stress thermal cycling experiments. After identical heat treatments, the specimens processed by one pass ECAE possess both higher transformation strain and higher irrecoverable strain as compared to those processed by four pass ECAE. However, the difference between the crystallographic texture contributions to the transformation strains of these specimens was minimal, and thus, the shape memory characteristics are believed to be influenced mainly by microstructural features. High dislocation density, small grain size, and precipitation of the omega phase were found to reduce not only the irrecoverable strain, but also the transformation strain.
AB - Severe plastic deformation of Ti74Nb26 shape memory alloy was conducted successfully at room temperature using equal channel angular extrusion (ECAE). In conjunction with short post-extrusion heat treatments, ECAE improved the maximum transformation strain of the alloy from 1% to 1.7%. Moreover, it drastically reduced the irrecoverable strain during constant-stress thermal cycling experiments. After identical heat treatments, the specimens processed by one pass ECAE possess both higher transformation strain and higher irrecoverable strain as compared to those processed by four pass ECAE. However, the difference between the crystallographic texture contributions to the transformation strains of these specimens was minimal, and thus, the shape memory characteristics are believed to be influenced mainly by microstructural features. High dislocation density, small grain size, and precipitation of the omega phase were found to reduce not only the irrecoverable strain, but also the transformation strain.
KW - Beta titanium alloys
KW - Crystallographic texture
KW - Equal channel angular processing
KW - Martensitic transformation
KW - Shape memory alloys
UR - http://www.scopus.com/inward/record.url?scp=79961172689&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2011.06.051
DO - 10.1016/j.msea.2011.06.051
M3 - Article
AN - SCOPUS:79961172689
VL - 528
SP - 7628
EP - 7635
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
SN - 0921-5093
IS - 25-26
ER -