TY - JOUR
T1 - Synchrotron x-ray study of texture in cold-worked shape-memory NiTi-wires
AU - Schuster, Andreas
AU - Voggenreiter, Heinz
AU - Balch, Dorian K.
AU - Dunand, David C.
N1 - Funding Information:
The authors acknowledge useful discussions with Prof. G. Eggeler (Ruhr-Universität Bochum, Germany) and Dr. U. Klemradt (Ludwig-Maximillian-Universität, Munich). The diffraction experiments were performed at the DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT) Synchrotron Research Center located at the Advanced Photon Source (Argonne National Laboratory, IL), whose staff we acknowledge for their technical support. DND-CAT is supported by the E.I. DuPont de Nemours & Co., The Dow Chemical Company, the US National Science Foundation through Grant No. DMR-9304725, and the State of Illinois through Grant No. IBHE HECA NWU 96. Use of the Advanced Photon Source was supported by the US Department of Energy under Contract No. W-31-102-Eng-38.
PY - 2001
Y1 - 2001
N2 - A series of martensitic, near-equiatomic NiTi shape-memory alloy wires was deformed to strains ranging from 1 to 40% up to stresses of 920 MPa. After deformation, the wires were exposed to a monochromatic, parallel beam of high energy x-rays oriented perpendicular to the wire axis. The transmitted low index diffraction rings show that martensitic texture is increasing with prestrain up to ε=15% after twinning is complete. Further prestraining in the plastic range lowers the texture again indicating that twinning- and plasticity-textures cancel partially each other. Also, deformed NiTi-wires were heated and cooled from 20°C to 200°C under a small constant stress of 6 MPa. The strain change due to the Two-Way Shape-Memory Effect was measured and correlated to the diffraction results.
AB - A series of martensitic, near-equiatomic NiTi shape-memory alloy wires was deformed to strains ranging from 1 to 40% up to stresses of 920 MPa. After deformation, the wires were exposed to a monochromatic, parallel beam of high energy x-rays oriented perpendicular to the wire axis. The transmitted low index diffraction rings show that martensitic texture is increasing with prestrain up to ε=15% after twinning is complete. Further prestraining in the plastic range lowers the texture again indicating that twinning- and plasticity-textures cancel partially each other. Also, deformed NiTi-wires were heated and cooled from 20°C to 200°C under a small constant stress of 6 MPa. The strain change due to the Two-Way Shape-Memory Effect was measured and correlated to the diffraction results.
UR - http://www.scopus.com/inward/record.url?scp=0035558805&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035558805&partnerID=8YFLogxK
U2 - 10.1557/proc-678-ee2.6.1
DO - 10.1557/proc-678-ee2.6.1
M3 - Conference article
AN - SCOPUS:0035558805
SN - 0272-9172
VL - 678
SP - [d]EE2.6.1-EE2.6.6
JO - Materials Research Society Symposium - Proceedings
JF - Materials Research Society Symposium - Proceedings
T2 - Applications of Synchrotron Radiation Techniques to Materials Science VI
Y2 - 16 April 2001 through 20 April 2001
ER -