| 退火温度对轧制变形镁锂合金组织与力学性能的影响 |
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| 引用本文： | 徐维健,王思雨,王丙兴.退火温度对轧制变形镁锂合金组织与力学性能的影响[J].金属热处理,2022,47(12):36-42. |
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| 作者姓名： | 徐维健 王思雨 王丙兴 |
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| 作者单位： | 东北大学 材料科学与工程学院, 辽宁 沈阳 110819 |
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| 摘 要： | 研究冷轧(压下量75%)及150、200、250和300 ℃等温退火1 h后Mg-8Li-1Al-0.5Sn合金的组织演变、力学性能以及变形机理。结果发现,合金伸长率随退火温度升高先增加再降低。退火温度为200 ℃时,合金伸长率达到最佳,为40%,相较冷轧态,强度无弱化表现,为212 MPa,伸长率提高24.4%。合金塑性的提升主要是由于退火促进合金内α相由带条状向竹节状转变,缓解应力集中,同时促进β相发生静态再结晶和晶粒细化。此外,α相轧制织构在退火过程中发生角度偏转,保留了有利于滑移的{1010}晶面织构,也对合金伸长率的提升起到促进作用。
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| 关 键 词： | 变形镁锂合金 冷轧 退火 组织演变 力学性能 |
| 收稿时间： | 2022-08-08 |
Effect of annealing temperature on microstructure and mechanical properties of rolled wrought Mg-Li alloy |
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| Xu Weijian,Wang Siyu,Wang Bingxing.Effect of annealing temperature on microstructure and mechanical properties of rolled wrought Mg-Li alloy[J].Heat Treatment of Metals,2022,47(12):36-42. |
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| Authors: | Xu Weijian Wang Siyu Wang Bingxing |
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| Affiliation: | School of Materials Science and Engineering, Northeastern University, Shenyang Liaoning 110819, China |
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| Abstract: | Microstructure evolution, mechanical properties and deformation mechanism of Mg-8Li-1Al-0.5Sn alloy after cold-rolling (deformation of 75%) and then isothermally annealed for 1 h at 150, 200, 250 and 300 ℃, respectively, were studied. The results show that the elongation increases first and then decreases with the increase of annealing temperature. When the annealing temperature is 200 ℃, the elongation of the alloy reaches the best, which is 40%, and compared with the cold-rolled alloy, the strength without weakening is 212 MPa, and the elongation is increased by 24.4%. The ductility of the alloy is improved mainly because that the annealing promotes the transformation of α phase from strip to bamboo-like, alleviates stress concentration and promotes static recrystallization and grain refinement of β phase. In addition, the α phase rolling texture is angular deflected during annealing, which retains the {1010} grain direction texture conducive to slip and promotes the elongation of the alloy. |
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| Keywords: | wrought Mg-Li alloy cold rolling annealing microstructure evolution mechanical properties |
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