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在Co-Ni-Al系合金的基础上用Cu部分代替Al,制备4种不同成分的合金,研究热处理对Co38Ni34Al28-xCux显微组织和显微硬度的影响。结果表明,Co38Ni34Al27.5Cu0.5合金经1350℃×2 h加热、冰水冷却至室温处理后,β基体内出现马氏体,而Co38Ni34Al27Cu1则在1350℃×2 h和1300℃×4 h处理时都出现马氏体。随铜含量的增加和铝含量的减少,合金β相晶粒变小,γ相晶粒和含量变大。Co38Ni34Al27.5Cu0.5的显微硬度随温度升高而升高,在β相晶粒内出现马氏体时,Co38Ni34Al27Cu1合金的显微硬度骤降。
Based on the Co-Ni-Al alloy, Cu was used instead of Al to prepare four alloys with different compositions. The effects of heat treatment on the microstructure and microhardness of Co38Ni34Al28-xCux were studied. The results show that the martensite appears in the β matrix and the Co38Ni34Al27Cu1 is annealed at 1350 ℃ for 2 h and 1300 ℃ × 4 h There are martensite. With the increase of copper content and the decrease of aluminum content, the alloy β phase grains become smaller and the γ phase grains and contents become larger. The microhardness of Co38Ni34Al27.5Cu0.5 increased with increasing temperature. The microhardness of Co38Ni34Al27Cu1 alloy decreased sharply when martensite appeared in the β phase grains.