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固溶時(shí)效工藝對(duì)7055鋁合金組織和力學(xué)性能的影響
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國(guó)家國(guó)際科技合作專項(xiàng)項(xiàng)目 (2011DFR50950)；國(guó)家科技支撐計(jì)劃課題 (2012BAF09B04)；重慶大學(xué)大型儀器設(shè)備開(kāi)放基金


Effects of Solution and Aging Treatments on the Microstructures and Mechanical Properties of 7055 Al Alloys
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    摘要:

    采用透射電子顯微鏡、光學(xué)顯微鏡、拉伸力學(xué)性能測(cè)試等手段比較分析了不同固溶時(shí)效工藝對(duì)7055鋁合金擠壓棒材微觀組織結(jié)構(gòu)和力學(xué)性能的影響規(guī)律和機(jī)理。結(jié)果表明，固溶和時(shí)效工藝的合理搭配對(duì)控制合金微細(xì)結(jié)構(gòu)、獲得理想的綜合力學(xué)性能有重要作用。采用470 ℃/20 min+480~490 ℃/20 min的兩級(jí)固溶處理可以進(jìn)一步減少合金中未溶化合物的數(shù)量，有利于增加時(shí)效強(qiáng)化效果；當(dāng)?shù)诙?jí)固溶溫度為490 ℃時(shí)，可以使未溶化合物數(shù)量明顯減小，其體積分?jǐn)?shù)從單級(jí)固溶的2.5%降低至約2.0%；晶粒尺寸在30~35 μm。本試驗(yàn)條件下，7055鋁合金擠壓棒材經(jīng) 470 ℃/20 min+485 ℃/20 min 兩級(jí)固溶處理和隨后的135 ℃/16 h + 190 ℃/10 min兩級(jí)時(shí)效處理，抗拉強(qiáng)度和屈服強(qiáng)度分別達(dá)到694和660 MPa，延伸率仍保持14%，合金具有最佳的綜合力學(xué)性能

    Abstract:

    The effects of solution and aging treatments on the microstructures and mechanical properties of 7055 Al alloy bars were studied by transmission electron microscopy, optical microscopy and tensile mechanical property testing. The results show that an appropriate combination of solution and aging treatments plays an important role in controlling microstructure so as to obtain improved mechanical properties. Two-step solution of 470 oC/20 min+480~490 oC/20 min could further decrease the amount of undissolved particles and is helpful to enhance age-strengthening. When the 2nd-step solution temperature is increased to 490 oC, the volume fraction of undissolved particles decreases remarkably, from 2.5% in the case of one-step solution treatment to 2.0%. The grain size of the as-solutioned alloys under experimental conditions is in the range of 30~35 μm. Optimum combined mechanical properties are achieved under the regime of 470 oC/20 min+485 oC/20 min solution- treatment followed by 135 oC/16 h + 190 oC/10 min aging treatment, with the tensile strength and yield strength being 694 MPa and 660 MPa, respectively, in the meantime maintaining a high elongation to failure of 14%

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張 靜,楊 亮,左汝林.固溶時(shí)效工藝對(duì)7055鋁合金組織和力學(xué)性能的影響[J].稀有金屬材料與工程,2015,44(4):956~960.[Zhang Jing, Yang Liang, Zuo Rulin. Effects of Solution and Aging Treatments on the Microstructures and Mechanical Properties of 7055 Al Alloys[J]. Rare Metal Materials and Engineering,2015,44(4):956~960.]
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  • 收稿日期:2014-04-29
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  • 在線發(fā)布日期: 2015-06-08
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