Materials Research Letters ( IF 8.3 ) Pub Date : 2019-05-09 , DOI: 10.1080/21663831.2019.1610106 Suming Zhu 1 , Chengcheng Wu 1 , Guannan Li 2 , Yufeng Zheng 2 , Jian-Feng Nie 1
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.
中文翻译:
可生物降解的Zn-0.1Li合金在人体温度下的蠕变特性:对其作为支架的耐久性的影响
这是关于可生物降解锌合金在人体温度下的蠕变性能的第一份报告。挤压成型的Zn-0.1Li(wt。%)合金在37°C和500 h内80-230 MPa应力下表现出明显的蠕变变形。低应力(80-155 MPa,屈服强度约为0.4-0.8)下的蠕变变形的特征在于应力指数约为4,活化能接近于锌的自扩散,这是位错蠕变的典型特征。讨论了在人体温度下蠕变对可生物降解锌合金作为支架的耐久性的影响。