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Cu-Cr-Zr-Sn合金的時效析出行為與性能
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“863”計劃項(xiàng)目(2006AA03Z522)；國家自然科學(xué)基金項(xiàng)目(50704006)


Aging Precipitation Behavior and Properties of Cu-Cr-Zr-Sn Alloy
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    摘要:

    采用TEM對Cu-0.22Cr-0.05Zr-0.05Sn合金不同形變熱處理狀態(tài)微觀組織的演變以及時效過程中析出相的狀態(tài)進(jìn)行研究，并以此解釋形變熱處理過程中合金力學(xué)性能和導(dǎo)電性能的變化。結(jié)果表明，合金中存在2種析出相，分別是Cr相和Cu4Zr相。其中Cr相在時效過程中分別經(jīng)歷了固溶體、GP區(qū)、脫溶并與基體共格以及長大；而Cu4Zr相則以早期Cr析出相為核伴隨析出，與基體半共格。由于析出相尺寸很小，且分布較為均勻，使合金具有很強(qiáng)的時效強(qiáng)化效果，經(jīng)940 ℃固溶1 h后冷加工至變形率為96%并在400 ℃時效4 h，合金的抗拉強(qiáng)度和電導(dǎo)率可分別達(dá)到400 MPa和84%IACS。對于該合金，時效溫度是決定合金綜合性能的關(guān)鍵，而時效時間對綜合性能的影響并不顯著。

    Abstract:

    The microstructure evolution and precipitates of Cu-0.22Cr-0.05Zr-0.05Sn alloy under different thermomechanical treatments were studied by TEM and the changes of mechanical property and electrical conductivity of the alloy were explained. Results show that two kinds of precipitates of Cr and Cu4Zr consist in the matrix. Cr precipitates undergo a course of solid solution, GP zone, precipitation, coherence with the matrix and coarsening. Cu4Zr precipitates are nucleated preferentially at the pre-nucleated Cr particles, and semi-coherent with the matrix. The alloy has a better aging strengthening effect duo to that the fine precipitates are well dispersed. The alloy has an excellent combination of tensile strength and electrical conductivity reaching 400 MPa and 84%IACS respectively when subjected to the optimum thermomechanical treatment, i.e., solution-treating at 940 oC for 1 h and cold drawing to 96% strain followed by aging at 400 oC for 4 h. To this alloy, aging temperature is a key factor to determine the combination properties while the effect of aging time is unnoticeable.

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解浩峰,米緒軍,黃國杰,高寶東,尹向前,李艷鋒. Cu-Cr-Zr-Sn合金的時效析出行為與性能[J].稀有金屬材料與工程,2012,41(9):1549~1554.[Xie Haofeng, Mi Xujun, Huang Guojie, Gao Baodong, Yin Xiangqian, Li Yanfeng. Aging Precipitation Behavior and Properties of Cu-Cr-Zr-Sn Alloy[J]. Rare Metal Materials and Engineering,2012,41(9):1549~1554.]
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  • 收稿日期:2011-09-08
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