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采用光学加热区熔法制备了目标成分为Fe72.5Ga27.5的Fe3Ga合金取向晶体,对Fe72.5Ga27.5合金分别进行了1100℃保温4 h和1100℃保温1 h/500℃保温3 d/350℃保温15 d两种热处理,研究了Fe72.5Ga27.5合金的相组成和热膨胀行为。结果表明,热处理前Fe72.5Ga27.5合金为D03相,1100℃保温4 h热处理得到D03相L12相的混合相,在1100℃保温1 h+500℃保温3 d+350℃保温15 d的热处理工艺条件下可获得完全单相的L12相结构。L12相结构的Fe3Ga合金在600℃到645℃温度区间其铁磁转变和相转变共同发生,使得在该温度范围附近出现了反常热膨胀,热膨胀系数接近于零。
The oriented crystal of Fe3Ga alloy with Fe72.5Ga27.5 was prepared by optical heating zone melting method. The Fe72.5Ga27.5 alloy was heat-treated at 1100 ℃ for 4 h and at 1100 ℃ for 1 h / 500 ℃ for 3 d / 350 ℃ for 15 days and two kinds of heat treatment. The phase composition and thermal expansion behavior of Fe72.5Ga27.5 alloy were studied. The results show that the Fe72.5Ga27.5 alloy before the heat treatment is D03 phase, and the mixed phase of D03 phase L12 phase is obtained by heat treatment at 1100 ℃ for 4 h, holding at 1100 ℃ for 1 h, holding at 500 ℃ for 3 days and holding at 350 ℃ for 15 days Under the conditions of technology can be completely single-phase L12 phase structure. The ferromagnetic and phase transitions of the L12-phase Fe3Ga alloy co-occur in the temperature range from 600 ℃ to 645 ℃, causing anomalous thermal expansion near the temperature range with a coefficient of thermal expansion close to zero.