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Creep properties of biodegradable Zn-0.1Li alloy at human body temperature: implications for its durability as stents
Zhu, Suming ; Wu, Chengcheng ; Li, Guannan ; Zheng, Yufeng ; Nie, Jian-Feng
Materials Research Letters, 2019, Vol.7 (9), p.347-353
Taylor & Francis
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Title:
Creep properties of biodegradable Zn-0.1Li alloy at human body temperature: implications for its durability as stents
Author:
Zhu, Suming
;
Wu, Chengcheng
;
Li, Guannan
;
Zheng, Yufeng
;
Nie, Jian-Feng
Subjects:
activation energy
;
Biodegradable
zinc
alloys
;
creep properties
;
stress exponent
Is Part Of:
Materials Research Letters, 2019, Vol.7 (9), p.347-353
Description:
This is the first report on creep properties of biodegradable zinc alloys at human body temperature. The extruded Zn-0.1Li (wt.%) alloy exhibits appreciable creep deformation at 37°C under stresses ranging 80-230 MPa within 500 h. The creep deformation at low stresses (80-155 MPa, about 0.4-0.8 yield strength) is characterized by a stress exponent of about 4 and an activation energy close to that for self-diffusion of zinc, which are typical of dislocation creep. The implications of creep at human body temperature for durability of biodegradable zinc alloys as stents are discussed. This is the first report on creep properties of biodegradable zinc alloys at human body temperature. It is demonstrated that creep resistance is another crucial parameter in the design of biodegradable Zn alloys.
Publisher:
Taylor & Francis
Language:
English
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