Effect of trace rare earth Er addition on the aging behavior of 1420 alloys was studied using hardness testing. Precipitation behavior during aging was investigated by electron microscopy transmission. It is found tha...Effect of trace rare earth Er addition on the aging behavior of 1420 alloys was studied using hardness testing. Precipitation behavior during aging was investigated by electron microscopy transmission. It is found that small amounts of Er can modify the aging behavior of 1420 alloy, for example, improve the hardness and shift peak aging time. All those results may be attributed to the increase of diffusion coefficient of Li atom in the Al matrix added with Er. As a consequence, rate of nucleation and growth of δ′ (Al_3Li) was promoted; the Al_3Er particles act as preferential sites for the nucleation and growth of δ′, which in turn results in the presentation of more composite particles.展开更多
The metastable extension of solid solubility and age hardening of rapidly solidified Al-Er alloy were inves- tigated.The splat foils(0.04～0.06 mm in thickness)and spun ribbons(0.02～0.04 mm in thickness)of Al-Er allo...The metastable extension of solid solubility and age hardening of rapidly solidified Al-Er alloy were inves- tigated.The splat foils(0.04～0.06 mm in thickness)and spun ribbons(0.02～0.04 mm in thickness)of Al-Er alloys were prepared by melt hammer-anvil and melt spinning techniques,respectively.The cooling rate was about 10~6～10~7 K/s.The metastable extended solid solubility of Er in Al evaluated by measurements of lat- tice parameters of rapidly solidified alloys was 0.75 at%.An age hardening response was observed in the quenched and aged specimen.The precipitate responsible for age hardening was identified to be Cu_3Au type cubic Al_3Er.展开更多
文摘Effect of trace rare earth Er addition on the aging behavior of 1420 alloys was studied using hardness testing. Precipitation behavior during aging was investigated by electron microscopy transmission. It is found that small amounts of Er can modify the aging behavior of 1420 alloy, for example, improve the hardness and shift peak aging time. All those results may be attributed to the increase of diffusion coefficient of Li atom in the Al matrix added with Er. As a consequence, rate of nucleation and growth of δ′ (Al_3Li) was promoted; the Al_3Er particles act as preferential sites for the nucleation and growth of δ′, which in turn results in the presentation of more composite particles.
基金The project was supported by National Natural Science Foundation of China(5870071).
文摘The metastable extension of solid solubility and age hardening of rapidly solidified Al-Er alloy were inves- tigated.The splat foils(0.04～0.06 mm in thickness)and spun ribbons(0.02～0.04 mm in thickness)of Al-Er alloys were prepared by melt hammer-anvil and melt spinning techniques,respectively.The cooling rate was about 10~6～10~7 K/s.The metastable extended solid solubility of Er in Al evaluated by measurements of lat- tice parameters of rapidly solidified alloys was 0.75 at%.An age hardening response was observed in the quenched and aged specimen.The precipitate responsible for age hardening was identified to be Cu_3Au type cubic Al_3Er.
