時效態C17200合金的組織與性能Microstructure and properties of aging C17200 alloy

采用 X 射線衍射(XRD)、透射電子顯微鏡(TEM)、高分辨電子顯微鏡(HRTEM)等分析手段研究 C17200合金時效過程中微觀組織演變，測試不同時效工藝處理后合金的硬度和電導率等性能。結果表明：合金經320 ℃時效1 h 后，基體(200)主峰的左側出現比較明顯的低角度邊帶峰，即合金發生調幅分解，使得在基體的(100)面上形成圓盤狀結構的 GP 區。合金在時效過程中存在兩種析出方式：晶界不連續析出和晶內連續析出，且連續析出序列為α 過飽和固溶體→GP 區→γ′→γ。調幅分解和γ′相析出是C17200 合金在時效過程中硬度升高并達到峰值的主要原因。

The microstructure evolution of C17200 alloy was studied in the precipitation process by Xray diffractometry, transmission electron microscopy and highresolution transmission electron microscopy. The hardness and electrical conductivity of this alloy after various aging processes were also tested. The results show that after the alloy was aged at 320 ℃ for 1 h, low angle sideband peak is observed at the left side of (200) peak of the matrix, and disklike GP zones form on (100) planes of the matrix by spinodal decomposition. Both discontinuous precipitation and continuous precipitation are found in the aging process of the alloy and the precipitation sequence of the continuous precipitation is α supersaturated solid solution→GP zones→γ′→γ. Making the hardness increase and reach the peak value are mainly attributed to spinodal decomposition and γ′ precipitation during the aging process.

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