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采用真空非自耗电弧炉制备出Fe24+xCo24-xCr15Mo14C15B6Y2(x=0,2,4,6,8,at％)块体非晶合金,利用热膨胀测试仪和激光闪射热导率测试仪测量合金的热膨胀系数和热导率并与差示扫描量热曲线和高温XRD图谱进行对比,研究不同Co含量块体非晶合金的线性热膨胀行为随温度的变化规律和Co元素含量、不同组织对铁钻基块体合金热导率的影响.结果表明,随着Co含量减小,不同Co含量铁钴基非晶合金均出现规律相似的两次晶化过程,并且二次晶化起始温度依次提高.当x=0时,在875℃附近热膨胀系数出现第3个极大值点;25℃时Fe24+xCo24-xCr15Mo14C15B6Y2 (x=0,2,4,6,8)铁钴基非晶合金热导率在7.12～7.35 W/(m·K)范围内,在700℃温度退火处理的Fe24+xCo24-xCr15Mo14C15B6Y2 (x=0,2,4,6,8)铁钴基非晶合金的热导率值为7.5～9.46 W/(m·K),然而920℃退火处理后,热导率变化比较显著并出现先升高后下降的趋势.

Fe24+xCo24-xCr15Mo14C15B6Y2(x=0,2,4,6,8,at％) bulk amorphous alloys were prepared by a non-consumable arc-melting furnace.The thermal expansion coefficient and thermal conductivity of the amorphous alloy were tested by thermal expansion test instrument and laser indeed thermal conductivity tester,respectively,and the results were compared with the differential scanning calorimetry (DSC) curves and XRD patterns.Linear thermal expansion behavior with the temperature change of FeCo-based amorphous alloys with different Co contents and the effect of different Co element contents and different organizations on thermal conductivity of FeCo-base amorphous alloy were investigated.The results show that with the decrease of Co content,FeCo-base amorphous alloys have two crystallization processes,and the initial and the secondary crystallization temperature increase in turn.Thermal expansion coefficient of Fe24Co24Cr15Mo14C15B6Y2 has the third maximum point around 875 ℃.At 25 ℃,thermal conductivity of the Fe24+xCo24-xCr15Mo14C15B6Y2 (x=0,2,4,6,8) iron cobalt base amorphous alloy is between 7.12～7.35 W/(m·K),while thermal conductivity of the Fe24+xCo24-xCr15Mo14C15B6Y2 (x=0,2,4,6,8) iron cobalt base amorphous alloys treated at 700 ℃ ranges from 7.5 to 9.46 W/(m·K).However,the thermal conductivity of Fe24+xCo24-xCr15Mo14C15B6Y2 (x=0,2,4,6,8) iron cobalt base amorphous alloys treated at 920 ℃ has a maximum value when x is up to 2 at％.