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雙級時效制度對6156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：2015-10-12
采用拉伸力學性能測試、電導率測定、晶間腐蝕實驗及透射電鏡分析等手段研究雙級時效處理條件下6156鋁合金的力學性能、電導率、晶間腐蝕和顯微組織結構，采用正交實驗優化雙級時效工藝。
雙級時效制度對6156鋁合金組織和性能的影響Effects of two-step aging treatment on?microstructure and properties of 6156 aluminum alloy
采用拉伸力學性能測試、電導率測定、晶間腐蝕實驗及透射電鏡分析等手段研究雙級時效處理條件下6156鋁合金的力學性能、電導率、晶間腐蝕和顯微組織結構，采用正交實驗優化雙級時效工藝。結果表明：在本研究范圍內，6156鋁合金雙級時效的四因素中第一級時效制度對合金的力學性能和電導率影響不大，第二級時效溫度和時間是影響合金最終性能的主要因素。對于6156鋁合金，最佳雙級時效工藝為(175 ℃，6 h)+(210 ℃，5 h)，相對于T6態，合金強度稍有降低，電導率上升，腐蝕類型也由晶間腐蝕轉變為點蝕，腐蝕深度明顯變淺。電鏡觀察結果表明：雙級時效處理后，晶內析出大量的Q′相，晶界析出相球化且析出相之間的間距增大，呈斷續分布，無沉淀析出帶(PFZ)變寬，這種微觀結構能有效提高6156合金的電導率和腐蝕性能，同時使合金具有較高的強度。
The effects of two-step aging treatment on the mechanical properties, electrical conductivity, intergranular corrosion and microstructure of 6156 aluminum alloy were investigated by means of tensile, conductivity measurement, intergranular corrosion experiments and transmission electron microscopy (TEM). The orthogonal test results show that the pre-aging has no obvious effect on the mechanical properties and electrical conductivity, and the second step aging temperature and time are the key factors in double aging parameters, which mainly decide the final properties of 6156 alloy. Under the optimum two-step aging treatment of (175 ℃, 6 h)+(210 ℃, 5 h), the ultimate strength decreases slightly and the electrical conductivity increases. The mode of corrosion changes from intergranular corrosion to pitting corrosion while the corrosion depth decreases obviously. The TEM observation results show that after two-step aging treatment, there are plenty of Q′ precipitates in matrix, and the coarse and isolate precipitates present in grain boundaries and the PFZ is broaden, which contribute to improve the electrical conductivity and corrosion resistance while the tensile strength decreases a little.
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