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7150鋁合金三級過時效熱處理制度
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-10-24
采用透射電子顯微鏡觀察(TEM)和力學性能測試研究7150鋁合金三級過時效熱處理制度中各階段對合金組織和力學性能的影響，并比較三級過時效熱處理制度與單級峰時效、雙級過時效、常規回歸再時效(RRA)處理的組織和力學性能。
7150鋁合金三級過時效熱處理制度Triple over-aging treatment of 7150 aluminum alloy
采用透射電子顯微鏡觀察(TEM)和力學性能測試研究7150鋁合金三級過時效熱處理制度中各階段對合金組織和力學性能的影響，并比較三級過時效熱處理制度與單級峰時效、雙級過時效、常規回歸再時效(RRA)處理的組織和力學性能。結果表明：采用(110 ℃, 16 h)欠時效制度作為合金的預時效制度，比采用(120 ℃, 24 h)峰時效制度作為合金的預時效制度更有利于晶內析出相的回溶；采用(190 ℃, 2 h) 作為第二級高溫時效制度，可以使合金晶內析出相部分回溶，晶界析出相充分斷開；采用(110 ℃, 16 h)+ (190 ℃, 2 h)+(120 ℃, 16 h)三級過時效制度時，在同一電導率水平下，合金的抗拉強度損失明顯低于采用雙級過時效制度時合金的抗拉強度損失。
The effects of each step of the triple over-aging treatment on the microstructure and mechanical properties of 7150 aluminum alloy were investigated by TEM and mechanical properties testing, and the microstructure and mechanical properties of alloys under one-step peak-aging, two-step over-aging, conventional RRA treatment and triple over-aging treatment conditions were compared. The results show that using (110 ℃, 16 h) as pre-aging treatment is more beneficial for the re-dissolution of precipitates in the matrix than using (120 ℃, 24 h) as pre-aging treatment. Using (190 ℃, 2 h) as the second high temperature aging, the matrix precipitates can dissolve partly, while the precipitates on the grain boundary disconnect completely. The tensile strength loss of the alloy treated by (110 ℃, 16 h)+(190 ℃, 2 h)+? (120 ℃, 16 h) triple over-aging is obviously less than that of the alloy treated by two-step over-aging at the same electrical conductivity level.
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