By Topic

Microtwin Structure and Its Influence on the Mechanical Properties of REBCO Coated Conductors

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

7 Author(s)
Kozo Osamura ; Research Institute of Applied Sciences, Kyoto, Japan ; Shutaro Machiya ; Yoshinori Tsuchiya ; Hiroshi Suzuki
more authors

The elastic properties of REBCO tape (i.e., REBa2Cu3 O7-d, RE = Y, Sm and Gd) have been investigated by means of diffraction techniques using synchrotron radiation. Total local strain Ahkll, which consists of thermal strain AhklT and lattice strain Ahkl, was analyzed using a microscopic structure model, with two types of microtwin configuration along the tensile axis, i.e., with the [100] or [110] crystal axis oriented parallel to the longitudinal direction of the tape. Experimental results were: (a) slope dAh00l/dA is larger than dA0k0l/dA (where A is the external tensile strain), which is attributed to the elastic modulus Ea along the a-axis being smaller than Eb along the b-axis; (b) both dAh00l/dA and dA0k0l/dA are smaller than unity, but dA110l/dA is almost unity depending on the configuration of microtwin; (c) the thermal strain for different planes is different as Ah00TA0k0T due to the elastic behavior of the superconducting layer being modified because it is constrained by the substrate and the outer metallic layer; and (d) a large Poisson ratio is attributed to this constraint state. It is suggested that the microtwin structure is critical to understand and model this unusual stress/strain behavior.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:22 ,  Issue: 1 )