Effects of deformation twinning on the mechanical properties of biodegradable Zn-Mg alloys.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 30533552.
- Also identified by DOI 10.1016/j.bioactmat.2018.11.001 and PMC identifier 6260435.
- Licence recorded as CC BY-NC-ND.
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Abstract
To satisfy the property requirements for biodegradable medical implants, Zn alloyed with low levels of Mg (≤0.8 wt%) has attracted increased research interest. In the present study, deformation twinning was observed in tensile tests and twinning appears to have an adverse impact on ductility. The profuse twinning in the as-cast Zn-Mg alloys accelerated crack growth in tension due to twinning impingement which caused local stress concentrations and initiates cracking. As-rolled Zn-Mg alloys have better ductility than their as-cast counterparts due to the inhibition of twinning by the refined Mg<sub>2</sub>Zn<sub>11</sub> intermetallic phase and the finer grain size.