時(shí)效態(tài)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(shí)效過程中微觀組織演變，測試不同時(shí)效工藝處理后合金的硬度和電導(dǎo)率等性能。結(jié)果表明：合金經(jīng)320 ℃時(shí)效1 h 后，基體(200)主峰的左側(cè)出現(xiàn)比較明顯的低角度邊帶峰，即合金發(fā)生調(diào)幅分解，使得在基體的(100)面上形成圓盤狀結(jié)構(gòu)的 GP 區(qū)。合金在時(shí)效過程中存在兩種析出方式：晶界不連續(xù)析出和晶內(nèi)連續(xù)析出，且連續(xù)析出序列為α 過飽和固溶體→GP 區(qū)→γ′→γ。調(diào)幅分解和γ′相析出是C17200 合金在時(shí)效過程中硬度升高并達(dá)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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