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利用光学显微镜(OM)、热场发射(FSEM)和XRD等分析手段研究不同含Cu量富铁Al-Si富镍相的演变,结果表明,随着Cu含量的增加,合金主要高温耐热相由粗大块状或汉字状(T-Al9 FeNi相+β-Al5 FeSi相)转变为(δ-Al3 CuFeNi相+γ-Al7 Cu4 Ni相)网状组织,进而演变为半环形的(δ-Al3 CuFeNi相+θ-Al2 Cui相);OM观察发现α-Al相由粗短枝晶逐渐转变为发达长轴晶,进一步演变为均匀分布的二次枝晶,由此促使合金中合金相由粗大聚集状逐渐演变为环状或半环状析出。
The evolution of nickel-rich Ni-rich Al-Si-rich phases with different contents of Cu was studied by optical microscope (OM), thermal field emission (FSEM) and XRD. The results show that with the increase of Cu content, (Δ-Al 3 FeNi phase + β-Al 5 FeSi phase) into (δ-Al 3 CuFeNi phase + γ-Al 7 Cu 4 Ni phase) network structure, and then evolved into a semicircular CuFeNi phase + θ-Al2Cui phase). OM observations showed that the α-Al phase gradually transformed from coarse short dendrites to developed long axis crystals and further to secondary uniformly distributed dendrites, thereby promoting the alloy phase from coarse Aggregate gradually evolved into a ring or semi-circular precipitation.