Abstract：
:An investigation was carried out on equal-channel angular pressing (ECAP) and extrusion processing of a ZM21 Mg alloy to obtain an improved candidate material for the manufacturing of biodegradable Mg stents. Ultrafine-grain size billets of the ZM21 alloy were obtained by two-stage ECAP aimed at achieving an initial refining of the structure at 200°C and then reaching the submicrometer grain size range by lowering the processing temperature down to 150°C. The investigation revealed a significant improvement in the properties of the ECAP-treated samples compared with the starting coarse-grained ZM21 alloy. The 0.2% yield strength rose from 180 to 340 MPa after 150°C ECAP processing, while maintaining a fairly high tensile ductility. The ultrafine ZM21 alloy billets were then used for the extrusion of stent precursors having the form of small-size tubes. The grain size after extrusion remained in the submicrometer range while the hardness was revealed to be significantly higher than that of the coarse-grained ZM21 Mg alloy. It was demonstrated that processing of biodegradable Mg stent having an ultrafine-grained microstructure by ECAP and low-temperature extrusion is feasible and that the obtained products feature promising properties.
journal_name
Acta Biomaterjournal_title
Acta biomaterialiaauthors
Ge Q,Dellasega D,Demir AG,Vedani Mdoi
10.1016/j.actbio.2013.01.010subject
Has Abstractpub_date
2013-11-01 00:00:00pages
8604-10issue
10eissn
1742-7061issn
1878-7568pii
S1742-7061(13)00013-5journal_volume
9pub_type
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