TY - CHAP
T1 - Shape memory, superelastic and low Young's modulus alloys
AU - Niinomi, Mitsuo
N1 - Funding Information:
The author thanks Professor T. Hattori of Meijo University (Nagoya, Japan) and Dr M. Nakai and Miss X. Zhao of the Institute for Materials Research, Tohoku University (Sendai, Japan), for assistance with the experiments. This study was partly supported by the Global COE Program ‘Materials Integration International Center of Education and Research, Tohoku University’ of The Ministry of Education, Culture, Sports, Science and Technology (MEXT, Tokyo, Japan), and The New Energy and Industrial Technology Development Organization (NEDO, Tokyo, Japan). In addition, this study was supported by the collaborative project between Tohoku University (Sendai, Japan) and Kyusyu University (Fukuoka, Japan), ‘Highly-functional Interface Science: Innovation of Biomaterials with Highly-functional Interface to Host and Parasite,’ (MEXT, Tokyo, Japan), the Light Metal Educational Foundation, Inc. (Osaka, Japan), the cooperative research program of the Institute for Materials Research, Tohoku University (Sendai, Japan), and the cooperative research program of the Advanced Research Center of Metallic Glasses, Institute for Materials Research, Tohoku University (Sendai, Japan).
PY - 2012/3
Y1 - 2012/3
N2 - The conventional shape memory alloy, TiNi, is widely used in biomedical implants. TiNi is receiving particular attention owing to its usefulness in stents and guide wires for catheters. However, the Ni in TiNi poses a high risk of allergic reaction, and so Ni-free shape memory and superelastic titanium alloys are being developed. Titanium alloys with a low Young's modulus are also required to inhibit stress shielding between implant and bone, because stress shielding leads to bone atrophy and poor bone remodeling. Titanium alloys with adjustable Young's moduli are being developed in order to satisfy the requirements of both surgeons and patients. In this chapter, the fundamental characteristics of shape memory and superelastic alloys for biomedical applications are discussed. In addition, the effects of alloying elements on the shape memory, superelastic behavior, biocompatibility and corrosion resistance, and endurance of TiNi are described. Further, the fabrication of TiNi sheets is covered. Finally, the developments of a new alloy, low Young's modulus alloys, and the metals required for spinal surgery are discussed.
AB - The conventional shape memory alloy, TiNi, is widely used in biomedical implants. TiNi is receiving particular attention owing to its usefulness in stents and guide wires for catheters. However, the Ni in TiNi poses a high risk of allergic reaction, and so Ni-free shape memory and superelastic titanium alloys are being developed. Titanium alloys with a low Young's modulus are also required to inhibit stress shielding between implant and bone, because stress shielding leads to bone atrophy and poor bone remodeling. Titanium alloys with adjustable Young's moduli are being developed in order to satisfy the requirements of both surgeons and patients. In this chapter, the fundamental characteristics of shape memory and superelastic alloys for biomedical applications are discussed. In addition, the effects of alloying elements on the shape memory, superelastic behavior, biocompatibility and corrosion resistance, and endurance of TiNi are described. Further, the fabrication of TiNi sheets is covered. Finally, the developments of a new alloy, low Young's modulus alloys, and the metals required for spinal surgery are discussed.
KW - Deformation-induced martensite
KW - Low Young's modulus
KW - Ni-free shape memory alloy
KW - Shape memory alloy
KW - Superelastic alloy
KW - TiNi
KW - β-type titanium alloy
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U2 - 10.1016/B978-1-84569-986-4.50015-5
DO - 10.1016/B978-1-84569-986-4.50015-5
M3 - Chapter
AN - SCOPUS:84901351304
SN - 9781845699864
SP - 462
EP - 490
BT - Biomaterials for Spinal Surgery
PB - Elsevier Ltd
ER -