B93пч合金挤压棒材在固溶及双级时效过程中的组织转变
Microstructure Evolution of Extruded B93пч Alloy Bar During Solution and Double-stage Aging
姜 锋, 韦莉莉, 黄宏锋, 蹇海根
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作者单位：(中南大学 材料科学与工程学院, 湖南 长沙 410083)
中文关键字：B93пч合金； 固溶； 双级时效； 显微组织转变； 性能
英文关键字：B93пч alloy; solution; double-stage aging; microstructure evolution; properties
中文摘要：通过扫描、透射电镜进行显微组织观察和能谱分析、力学性能测试、电导率测量等途径，研究了B93пч合金在固溶及双级时效处理过程中的组织转变规律，探讨了组织转变和性能变化之间的联系。结果表明，B93пч合金棒材中的条状η和T相在固溶过程中明显溶入基体，而大块状和圆片状η和T相也部分溶入基体，变为小块状和小圆片状。Al6(CuFe)相未能溶入基体，仍呈较大块状。经过逐步提高二级时效温度的双级时效后，合金强度降低，主要原因是基体析出相发生η′相向η相的转变，析出相长大粗化，密度降低。双级时效后还出现了晶间无沉淀析出带，并且随时效温度的升高而宽化。
英文摘要：The microstructure evolution of extruded B93пч alloy during solution treatment and double-stage aging process, together with the relationship between microstructure evolution and properties, was investigated by scanning electron microscopy with EDX, transmission electron microscopy, tensile tests and conductivity measurement. The results show that the strip shaped η and T phases in this alloy dissolve into the matrix evidently. The bulk and plate shaped η and T phases dissolve partially and change into small ones. The Al6(CuFe) phase can not dissolve and remain to be bulk-shaped. The main reasons for the decrease of tensile strength when the second step aging temperature enhance gradually are the phases transformation from η′ to η, besides their growth and coarsening. The precipitated free zones appear and widen as the aging temperature increasing.