【摘要】 Ni-Cr-3％Al-0.2％Ce合金0.3mm细丝经500～600℃时效处理,用透射和扫描电镜观察组织形貌,用化学定量提取法和测定微区成分的方法确定相Ni、Cr、Al的含量,用程控图像仪测定富Cr(α)相析出颗粒大小和分布,查明γ’相沿基体{100}面共格析出并呈细小颗粒状,在γ’相周围析出的过饱和富Cr(α)相弥散分布在合金基体中。据此认为该合金是由γ’相和富Cr(α)相复合析出强化合金基体的。更多还原

【Abstract】 0. 3mm threads of Ni-Cr-3%Al-0. 2%Ce alloy are treated byageing at 500-600℃. The structural shape is observed with scanning and transmis-sion electronic microscopes. The contents of Ni,Cr and Al phases are determined by methods of quantitative extraction and micro-district composition determination. The grains size and distribution of Cr(α)-rich phase are determined by program con-trolled picture instruments. It is realed that γ’ phase is seperated as eutectic along the {100} face of matrix with the shape of fine particles,and the oversaturated Cr (α)-rich phase seperated around γ’ phase is dispersively distributed within alloy matrix. The matrix of this alloy is strengthened by compound separation of γ’ and Cr(α)-rich phase.更多还原