2A66鋁鋰合金板材各向異性研究

2A66鋁鋰合金板材各向異性研究Anisotropy of 2A66 Al-Li Alloy Sheet

采用布氏硬度與拉伸性能測試以及OM，SEM和TEM分析，研究2A66鋁鋰合金板材力學(xué)性能的各向異性隨時效時間變化的規(guī)律和合金時效狀態(tài)下的顯微組織，并探討影響各向異性的主要因素。結(jié)果表明：165℃峰值時效前，隨時效時間的延長，2A66鋁鋰合金力學(xué)性能的各向異性程度逐漸下降，過時效后合金的各向異性有所增強，伸長率的各向異性大于強度各向異性。峰時效（64h）時合金的σb，σ0.2，δ的IPA值均達(dá)到了最低值，分別為3.0%，3.0%，12.2%，此時合金也獲得了較好的強塑性結(jié)合，軸向σb，σ0.2，δ分別為526.5，448.9MPa，10.1%。不同熱處理狀態(tài)下，2A66鋁鋰合金平面各向異性的總體表現(xiàn)為：縱向（0°）和橫向（90°）的強度最高，45°方向最低；45°方向試樣的伸長率最高，縱向和橫向最低。

The anisotropy and microstructures during aging treatment for 2A66 Al-Li alloy were studied by Brinell hardness, tensile testing, optical microscope(OM), scanning electron microscope(SEM) and transmission electron microscope (TEM). The main factors which influence the anisotropy of mechanical properties were discussed. The results indicate that, before 165℃ peak-aged, the anisotropy of the mechanical properties of the 2A66 Al-Li alloy decreases gradually with the extension of aging time. When the alloy is over-aged, the anisotropy of the alloy increases; the anisotropy of ductility is more serious than that of strength. The IPA values of σb, σ0.2 and δ of the alloy reach the lowest value at 3.0%, 3.0% and 12.2% respectively at the time of peak aging (64h), and the alloy is also obtained with good plasticity and axial tensile properties. σb, σ0.2 and δ of the alloy are 526.5, 448.9MPa, 10.1% respectively. Under different heat treatment conditions, the general behavior of the anisotropy of 2A66 Al-Li alloy is as follows: longitudinal (0°) and transverse (90°) have the highest strength, 45° direction is the lowest strength; 45° direction specimen has the highest elongation, vertical and horizontal direction has the minimum elongation.

全文下載：https://pan.baidu.com/s/1nvxbshV