Al-(Zr)-(Pr)-(Cr)合金析出和再结晶行为研究

A study of precipitation and recrystallization in Al-(Zr)-(Pr)-(Cr) alloys

摘要:

采用透射电镜和高分辨透射电镜研究了Al-Zr-Pr-Cr合金中析出弥散相的结构和稳定性。采用硬度和金相观察对比了弥散相在500℃的析出硬化作用及其稳定性，以及对合金再结晶的抑制作用。研究结果表明：由于热处理析出了大量共格的、L12结构的15~20nm含Pr的 (Al, Cr)3Zr弥散相，因此Al-0.16Zr-0.26Pr-0.18Cr合金具有显著地析出硬化效果、热稳定性和抑制再结晶效果。其高温析出硬化及抑制铝基体再结晶作用优于Al3Zr和含Pr的Al3Zr弥散相。

Abstract:

Structure and thermal stability of nano-sized dispersoids in Al-(Zr)-(Pr)-(Cr) alloys have been revealed by conventional and high-resolution transmission electron microscopy. Al-0.16Zr-0.26Pr-0.18Cr alloy (wt.%) illustrates significant precipitation strengthening, thermal stability and inhibit-recrystallization ability by forming a relatively high density of coherent and well-dispersed Pr-containing (Al, Cr)3Zr dispersoids (15 - 20 nm) with L12 structure. The dispersoid is coherent even exposed at 500℃ for 400 h. Pr-containing (Al, Cr)3Zr dispersoid is finer and coarsening-resistant around 500 癈, as compared with L12-structured Al3Zr and Pr-containing Al3Zr dispersoid.