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雙級時效對1973鋁合金組織和性能的影響
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-11-03
采用透射電鏡觀察、硬度和電導率測試等手段研究雙級時效對1973高強高韌鋁合金組織和性能的影響。
雙級時效對1973鋁合金組織和性能的影響Effect of two-stage ageing on microstructures and?properties of 1973 aluminum alloy
采用透射電鏡觀察、硬度和電導率測試等手段研究雙級時效對1973高強高韌鋁合金組織和性能的影響。結果表明：一級時效溫度對合金最終組織和性能的影響不大，二級時效溫度和時間對1973鋁合金硬度和電導率的影響明顯；1973鋁合金適宜的雙級時效工藝為(120 ℃, 6 h)＋(160 ℃, 16 h)，在此條件下，合金的硬度和電導率分別為191HV和38.0%(IACS)，其顯微組織特點為晶內沉淀相呈細小彌散狀分布，而合金的晶界沉淀相粗大、呈斷續狀分布，并且有較明顯的無沉淀析出帶。合金中主要沉淀相為η'相和η相，此外還有少量的GPⅡ區。
The two-stage ageing on the microstructures and properties of 1973 aluminum alloy were studied by means of transmission electron microscopy (TEM), hardness and conductivity measurements. The results show that the temperature and time of the second-stage ageing have a key effect on the properties of the alloy, while the temperature of the first-stage ageing has little effect on them. The best two-stage ageing process for this alloy is: (120 ℃, 6 h)＋(160 ℃, 16 h). Under this condition, the hardness and electrical conductivity of this alloy are 191HV and 38.0%(IACS), respectively. The microstructure of this alloy is that the nano scale precipitates disperse inside the grain, and the coarse-discontinuous precipitates occur along the grain boundaries. The precipitated-free zones (PFZ) appear on the grain boundaries. The main precipitates are η and η' phases, and with minous GPⅡ zone.
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