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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。
By means of scanning and transmission electron microscopy, the microstructure and energy spectrum, mechanical properties and electrical conductivity measurements were used to study the microstructure and mechanical properties of B93- пч alloy in solution and two-stage aging treatment. The microstructure and properties of B93- The link between changes. The results show that the nodular η and T phases in B93 alloy bar obviously dissolve into the matrix during the solid solution process, whereas the bulk and value η and T phase also partially dissolve into the matrix and become small and small Disc shape. Al6 (CuFe) phase failed to dissolve into the matrix, still showed a larger lumps. After two-stage aging, the strength of the alloy decreases gradually after the second-stage aging temperature is increased gradually. The main reason is the transformation of η ’phase to η phase in the precipitated phase of the matrix. The precipitated phase grows coarse and the density decreases. After two-stage aging also appeared between the precipitation of precipitation-free zone, and with the aging temperature and widening.