General Poster Session: Biomaterials
Program Organizers: TMS Administration

Monday 5:30 PM
February 24, 2020
Room: Sails Pavilion
Location: San Diego Convention Ctr


Cancelled
B-33: Zn-0.8Li Alloy with Superior Mechanical Properties and Ideal Degradation Rate for Biomedical Stents: Lu-Ning Wang1; 1University of Science and Technology Beijing
    Fabricated through a newly developed hot-warm rolling process, yield strength (YS), the ultimate tensile strength (UTS) and elongation to failure (EL) of Zn-0.8Li (in wt.%) alloy respectively reach 261.5 MPa, 401.4 MPa and 80.8%, far beyond the clinical benchmark for biodegradable stents (i.e., YS > 200 MPa, UTS > 300 MPa, EL>15~18 %). Li distribution is determined by three dimensional atom probe (3D-AP), which reveals the formation of metastable α-Li2Zn3 precipitates with an average size of 4.4 nm and a number density of 7.16×1022 m-3. Through transmission electron back-scatter diffraction (T-EBSD), it is revealed that the alloy contains sub-micron Zn grains with an average size of 640 nm, which exhibit a strong basal structure. Precipitation of α-Li2Zn3 and sub-micron grains contribute to the superior mechanical properties. The degradation rate of the alloy is 9.8 μm/y in simulated body fluid (SBF), fulfilling the clinical benchmark (i.e., <20μm/y).