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2A97鋁鋰合金雙級(jí)時(shí)效研究
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國家“973”項(xiàng)目(2005CB623705)


Study on Double-Aging of 2A97 Aluminum-Lithium Alloy
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    摘要:

    通過TEM分析和常規(guī)力學(xué)性能測試，研究雙級(jí)時(shí)效工藝對(duì)2A97鋁鋰合金組織和性能的影響，以優(yōu)化合金強(qiáng)度和塑性匹配。結(jié)果表明：隨預(yù)時(shí)效溫度升高，雙級(jí)時(shí)效基體由形成θ'/θ?相和δ′相為主的組織轉(zhuǎn)變?yōu)樾纬蒚1相、θ"/θ′和δ′相為主的組織。135 ℃預(yù)時(shí)效、雙級(jí)時(shí)效基體形成大量細(xì)小的θ'/θ?相和δ′相，T1數(shù)量少。晶界和亞晶界T1數(shù)量多，尺寸小，晶界和亞晶界θ'/θ?無析出帶寬度窄。155 ℃預(yù)時(shí)效、雙級(jí)時(shí)效可在基體形成以T1相為主的組織，且數(shù)量多，尺寸大，均勻分布，T1相、θ"/θ′和δ′相的聯(lián)合強(qiáng)化作用使合金具有高的強(qiáng)度

    Abstract:

    To optimize the relationship of strength and ductility of an aluminum-lithium alloy, 2A97, a double-aging treatment was employed. The effect of double-aging processes on microstructures and tensile properties was investigated by transmission electron microscopy (TEM) and tensile tests. Results show that with the pre-aging temperature increasing, the formation of the strengthening precipitates T1 is promoted at the matrix at 155 oC, instead of the precipitation of θ"/θ′ and δ′ phases at 135 oC. It is different from that T1 precipitates nucleate and grow mainly at grain and subgrain boundaries at 135 oC. Numerous fine θ"/θ′ precipitates at the matrix at 135 oC cause the reduction of the width of θ"/θ′ precipitates-free zones adjacent to grain and subgrain boundaries and the size of equilibrium precipitates T1 at grain and subgrain boundaries. Numerous larger precipitates T1 dispersing homogeneously at matrix, combined with numerous large size θ′ and δ′ precipitates, yield higher tensile strength for the microstructure of double aging with 155 oC pre-aging than that of double aging with 135 oC pre-aging

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袁志山,陸 政,謝優(yōu)華,吳秀亮,戴圣龍,劉常升.2A97鋁鋰合金雙級(jí)時(shí)效研究[J].稀有金屬材料與工程,2011,40(3):443~447.[Yuan Zhishan, Lu Zheng, Xie Youhua, Wu Xiuliang, Dai Shenglong, Liu Changsheng. Study on Double-Aging of 2A97 Aluminum-Lithium Alloy[J]. Rare Metal Materials and Engineering,2011,40(3):443~447.]
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