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.结果表明:由于热处理析出了大量共格的、L12结构的15～20 nm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、热稳定性和抑制冉结晶效果.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.
Structure and thermal stability of nano-sized dispersoids in Al-(Zr)-(Pr)-(Cr) alloys have been revealed by conventional and high-resolution transmission electron microscopes.Results show that A1-0.16Zr-0.26Pr-0.18Cr alloy (wt％) exhibits significant precipitation strengthening,thermal stability and recrystallization-resistant ability by forming a relatively high density of well-dispersed Pr-containing (Al,Cr)3Zr dispersoid (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 ℃,as compared with L12-structured Al3Zr and Pr-containing Al3Zr dispersoids.
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