Qu Zhan, Liu Lulin, Deng Youming, Tao Ran, Liu Weidong, Zheng Zhongren, Zhao Ming-Chun
Xiangya Hospital, Central South University, Changsha 410008, China.
International Joint Research Center of Minimally Invasive Endoscopic Technology Equipment & Standards, Changsha 410008, China.
Materials (Basel). 2022 Aug 1;15(15):5295. doi: 10.3390/ma15155295.
This work studied the relationship between biodegradation rate and grain size itself, excluding other structural factors such as segregations, impure inclusions, second phase particles, sub-structures, internal stresses and textures caused by alloying additions and deformation processing for pure Mg. A spectrum of grain size was obtained by annealing through changing the annealing temperature. Grain boundary influenced the hardness and the biodegradation behavior. The hardness was grain size-dependent, following a typical Hall-Petch relation: HV=18.45+92.31d-12. The biodegradation rate decreased with decreasing grain size, following a similar Hall-Petch relation: Pi=0.17-0.68d-12 or Pw=1.34-6.17d-12. This work should be helpful for better controlling biodegradation performance of biodegradable Mg alloys through varying their grain size.
本研究探讨了纯镁的生物降解速率与晶粒尺寸本身之间的关系，排除了其他结构因素，如偏析、杂质夹杂物、第二相粒子、亚结构、内应力以及由合金添加和变形加工引起的织构。通过改变退火温度进行退火，获得了一系列晶粒尺寸。晶界影响硬度和生物降解行为。硬度与晶粒尺寸有关，遵循典型的霍尔-佩奇关系：HV = 18.45 + 92.31d - 1/2。生物降解速率随晶粒尺寸减小而降低，遵循类似的霍尔-佩奇关系：Pi = 0.17 - 0.68d - 1/2或Pw = 1.34 - 6.17d - 1/2。这项工作有助于通过改变晶粒尺寸更好地控制可生物降解镁合金的生物降解性能。
