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熱機械加工對2099鋁鋰合金擠壓材組織與抗腐蝕性能的影響
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江蘇省工業(yè)科技支撐計劃項目(BE2008118)；江蘇大學(xué)“拔尖人才培養(yǎng)工程”基金(1211110001)


Effect of Thermo-Mechanical Processing on Microstructure and Corrosion Resistance of 2099 Al-Li Alloy Extrusions
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    摘要:

    采用金相組織觀察、XRD分析、硬度和導(dǎo)電率測試等手段，研究了熱機械加工(Thermo-Mechanical Processing, TMP)對2099鋁鋰合金擠壓材組織、硬度、導(dǎo)電率、晶間腐蝕及剝落腐蝕性能的影響。結(jié)果表明：與經(jīng)T83 (540 ℃/2 h固溶、3%預(yù)壓縮、121 ℃/14 h + 181 ℃/48 h時效)熱處理的2099鋁鋰合金擠壓材相比，經(jīng)TMP(540 ℃/2 h固溶、400 ℃/48 h過時效、約50%大應(yīng)變變形、540 ℃/2 h再結(jié)晶/固溶)+(121 ℃/14 h + 181 ℃/48 h時效)處理的2099鋁鋰合金擠壓材發(fā)生了明顯的再結(jié)晶，硬度（HV）降低(從2006.2 MPa到1865.3 MPa)，位錯強化亦降低，但導(dǎo)電率和抗晶間腐蝕性能明顯提高，同時抗剝落腐蝕性能也有所提高。結(jié)果表明，熱機械加工是不顯著降低2099鋁鋰合金擠壓材硬度，但顯著提高其抗晶間腐蝕性能的有效途徑

    Abstract:

    The effects of Thermo-Mechanical Processing(TMP) on microstructure, hardness, electricity, intergranular and exfoliation corrosion resistance of extruded 2099 Al-Li alloy were investigated by microstructure observation, XRD analysis, hardness and electric conductivity testing. The results show that compared with the extruded 2099 Al-Li alloy after T83 heat treatment (540 °C/2 h solid solution, 3% pre-compression, 121 °C/14 h + 181 °C/48 h aging), the samples after TMP (540 °C/2 h solid solution, 400 °C/48 h overaging, about 50% large strain deformation, 540 °C/2 h solid solution)+(121 °C/14 h + 181 °C/48 h aging) recrystallize obviously. The HV hardness is a little lower(2006.2 MPa vs 1865.3 MPa) and so is dislocations strengthening. The electric conductivity and the intergranular corrosion resistance are improved significantly and the exfoliation corrosion resistance is also enhanced. This study shows that TMP is an effective method to improve the intergranular resistance with the hardness not greatly reduced

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張振強,許曉靜,宋 濤,張允康,羅 勇,吳 瑤,鄧平安.熱機械加工對2099鋁鋰合金擠壓材組織與抗腐蝕性能的影響[J].稀有金屬材料與工程,2013,42(12):2619~2624.[Zhang Zhenqiang, Xu Xiaojing, Song Tao, Zhang Yunkang, Luo Yong, Wu Yao, Deng Ping’an. Effect of Thermo-Mechanical Processing on Microstructure and Corrosion Resistance of 2099 Al-Li Alloy Extrusions[J]. Rare Metal Materials and Engineering,2013,42(12):2619~2624.]
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  • 收稿日期:2012-12-13
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