Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1528622 | Materials Science and Engineering: B | 2015 | 9 Pages |
Abstract
It is demonstrated that the mechanical properties and corrosion resistance of Mg-2.5Â wt%Zn-1Â wt%Ca alloy are enhanced by the microstructural changes imparted by hot extrusion. A processing procedure is developed to form hollow tubes with an outer diameter of â¼2.0Â mm and wall thickness of â¼0.1Â mm, which is well suited for subsequent stent manufacturing. The influence of thermal and mechanical processing on corrosion and plasticity was found to be associated with grain-size reduction and the redistribution of intermetallic particles within the microstructure, providing significant improvement of performance over the cast alloy. Observation of the fracture surfaces reveals a mode transition from brittle (cast) to ductile (processed). Enhanced mechanical properties and decreased resorption rate represent significantly improved performance of this alloy after the novel processing sequence. Based on the improved properties, the produced Mg alloy is more suitable for practical in vivo applications.
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Authors
Dexue Liu, Chenggong Guo, Liqiang Chai, Vincent R. Sherman, Xiaoqiong Qin, Yutian Ding, Marc A. Meyers,