利用透射电镜(TEM)、能谱分析(EDS)和X射线衍射(XRD)技术研究了快速凝固Al-Cr-Zr-Nb合金的显微组织及析出过程.结果表明:在快速凝固条件下,形成等轴晶和胞状晶结构,Zr、Cr、Nb元素固溶在过饱和Al基固溶体中.而在随后的350℃×2h退火处理后,有少量Al13CCr2相和亚稳超点阵Ll2-Al3Zr相析出;经500℃×2h退火处理后,亚稳Ll2-Al3Zr相转变为稳定相DO23-Al3Zr,并有大量Al13Cr2相析出.Al基点阵参数的变化与上述时效过程相一致.
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