Material and Manufacturing Technologies:

Development of biodegradable Zn alloys and investigation of Second phases and their alloy properties

One of the ways that is widely used to improve mechanical properties of pure Zn is alloying combined with plastic deformation processing. As-cast Zn and its alloys are brittle. Beside plastic deformation processing, no effective technique has yet been found to remove the brittleness and even endow room temperature super-ductility. Second phase, made by alloying, not only largely specifies the potency of plastic deformation, but also affects strength, corrosion rate and cytotoxicity. Controlling second phase is necessary for designing biodegradable Zn alloys.

One of the ways that is widely used to improve mechanical properties of pure Zn is alloying combined with plastic deformation processing. As-cast Zn and its alloys are brittle. Beside plastic deformation processing, no effective technique has yet been found to remove the brittleness and even endow room temperature super-ductility. Second phase, made by alloying, not only largely specifies the potency of plastic deformation, but also affects strength, corrosion rate and cytotoxicity. Controlling second phase is necessary for designing biodegradable Zn alloys. In recent research study, knowledge related to second phases in biodegradable Zn alloys has been analyzed, including features of binary phase diagrams, volume fraction of second phase in function of atomic percentage of an alloying element.

Conflicts about second phases in Zn–Li, Zn–Cu and Zn–Fe systems have been settled down, which interests future studies. In this studym the effects of alloying elements and second phases on microstructure, strength, ductility, corrosion rate and cytotoxicity have been neatly summarized. Mg, Mn, Li, Cu and Ag are suggested as the main alloying elements, due to their outstanding useful impacts on at least one of the mentioned properties. In future, synergistic effects of these elements should be more thoroughly investigated. For other nutritional elements, such as Fe and Ca, refining second phase is a subject of essential interests.

Source:

https://www.sciencedirect.com/science/article/pii/S2452199X20300220

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