(1 中國科學(xué)院金屬研究所六室，沈陽 110015；
2 大連理工大學(xué)材料工程系， 大連 116024)
摘 要: 研究了Ni-25Al-15Cr(摩爾分?jǐn)?shù)，%)多相金屬間化合物合金的顯微組織及熱處理對其組織的影響。結(jié)果表明：1200℃24h均勻化后的冷卻速度不僅影響β相中α-Cr析出物的尺寸，且影響β相的成分及體積分?jǐn)?shù)；空冷后時效，β相分解成γ
關(guān)鍵字: NiAl合金；金屬間化合物；顯微組織；熱處理
（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
