(1 中国科学院金属研究所六室，沈阳 110015；
2 大连理工大学材料工程系， 大连 116024)
摘 要: 研究了Ni-25Al-15Cr(摩尔分数，%)多相金属间化合物合金的显微组织及热处理对其组织的影响。结果表明：1200℃24h均匀化后的冷却速度不仅影响β相中α-Cr析出物的尺寸，且影响β相的成分及体积分数；空冷后时效，β相分解成γ
关键字: NiAl合金；金属间化合物；显微组织；热处理
（1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, P.R.China
2. Department of Material Engineering, Dalian University of Technology, Dalian 116024 P. R. China）
Abstract:The effects of heat treatment on the microstructure of a multiphase Ni-25%Al-15%Cr(mole fraction) intermetallic alloy have been investigated. It is shown that cooling rates following homogenization affect not only the size of α-Cr inβ phase but also the composition and volume fraction of β phase. Theβphase may either decompose into γ' and more strongly ordered βphase or remain stable during aging, depending on the cooling rates preceding aging. The relationships between stability of β phase and cooling rates preceding aging has also been discussed.
Key words: nickel-aluminium alloys; intermetallic compounds; microstructure; heat treatment
