退火温度对轧制变形镁锂合金组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2022.12.006

金属热处理 ›› 2022, Vol. 47 ›› Issue (12): 36-42.DOI: 10.13251/j.issn.0254-6051.2022.12.006

退火温度对轧制变形镁锂合金组织与力学性能的影响

徐维健, 王思雨, 王丙兴

东北大学材料科学与工程学院, 辽宁沈阳 110819

收稿日期:2022-08-08 修回日期:2022-10-12 出版日期:2022-12-25 发布日期:2023-01-05
通讯作者: 王丙兴,副教授,博士,E-mail:wangbx@ral.neu.edu.cn
作者简介:徐维健(1996—),男,硕士,主要研究方向为镁锂合金变形,E-mail:2298424728@qq.com。

Effect of annealing temperature on microstructure and mechanical properties of rolled wrought Mg-Li alloy

Xu Weijian, Wang Siyu, Wang Bingxing

School of Materials Science and Engineering, Northeastern University, Shenyang Liaoning 110819, China

Received:2022-08-08 Revised:2022-10-12 Online:2022-12-25 Published:2023-01-05

摘要/Abstract

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。

关键词: 变形镁锂合金, 冷轧, 退火, 组织演变, 力学性能

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.

Key words: wrought Mg-Li alloy, cold rolling, annealing, microstructure evolution, mechanical properties

中图分类号:

TG146.2

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.

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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退火温度对轧制变形镁锂合金组织与力学性能的影响

Effect of annealing temperature on microstructure and mechanical properties of rolled wrought Mg-Li alloy

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