Effects of small additions of Zn on the microstructure, mechanical properties and corrosion resistance of WE43B Mg alloys
来源期刊：International Journal of Minerals Metallurgy and Materials2019年第7期
论文作者：V.A.Bautin
文章页码：858 - 868
摘 要：Zn is a commonly used alloying element for Mg alloys owing to its beneficial effects on mechanical properties. To improve the mechanical and corrosion properties of WE43 B Mg alloys, the effects of 0–0.7 wt% Zn addition on the microstructure and properties of sample alloys were investigated. Addition of Zn to as-cast WE43 B alloy promoted the formation of the Mg12 Nd phase; by contrast, after T6 heat treatment, the phase composition of WE43 B alloys with and without Zn addition remained mostly the same. A long-period stacking ordered phase was predicted by CALPHAD calculation, but this phase was not observed in either the as-cast or heat-treated Zn-containing WE43 B alloys. The optimum temperature and duration of T6 heat treatment were obtained using CALPHAD calculations and hardness measurements. Addition of Zn resulted in a slight reduction in the average grain size of the as-cast and T6 heat-treated WE43 B alloys and endowed them with increased corrosion resistance with little effect on their mechanical properties.
V.A.Bautin
摘 要：Zn is a commonly used alloying element for Mg alloys owing to its beneficial effects on mechanical properties. To improve the mechanical and corrosion properties of WE43 B Mg alloys, the effects of 0–0.7 wt% Zn addition on the microstructure and properties of sample alloys were investigated. Addition of Zn to as-cast WE43 B alloy promoted the formation of the Mg12 Nd phase; by contrast, after T6 heat treatment, the phase composition of WE43 B alloys with and without Zn addition remained mostly the same. A long-period stacking ordered phase was predicted by CALPHAD calculation, but this phase was not observed in either the as-cast or heat-treated Zn-containing WE43 B alloys. The optimum temperature and duration of T6 heat treatment were obtained using CALPHAD calculations and hardness measurements. Addition of Zn resulted in a slight reduction in the average grain size of the as-cast and T6 heat-treated WE43 B alloys and endowed them with increased corrosion resistance with little effect on their mechanical properties.
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