高温多向异步轧制对LZ91镁锂合金组织和力学性能的影响

doi:10.11868/j.issn.1001-4381.2021.001196

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摘要

采用异步轧制、多向异步轧制、高温异步轧制、高温多向异步轧制四种不同的方式轧制双相镁锂合金板材。通过光学显微镜、MTS E43拉伸试验机和X射线衍射仪观察不同工艺轧制后合金的显微组织、力学性能以及织构特征，综合分析温度和轧制方向条件耦合对镁锂合金组织和力学性能的影响。结果表明：四种轧制工艺可以使α-Mg相沿轧制方向伸长，同时沿着轧制方向法向细化。高温多向异步轧制后α相厚度最低为2.6 μm。多向异步轧制后材料的屈服强度、抗拉强度、伸长率分别为149，167 MPa，14.5%，其综合力学性能最优。多向轧制使双峰织构沿ND方向45°偏转，高温轧制使双峰织构由基极向RD方向偏转的角度降低。轧制后样品R-cube织构组分最强，高温多向异步轧制使β-Li相轧制织构转变成为{001}〈100〉织构，有利于{011}〈1${\rm{\bar 1}}$1〉滑移系发生多滑移。

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	王格格
	李晓燕
	郭非
	张紫璇
	陈翠玉
	朱召渲
	胡怡

关键词 ：镁锂合金, 异步轧制, 多向异步轧制, 高温异步轧制, 高温多向异步轧制, 织构

Abstract：

Dual-phase magnesium-lithium alloys sheets were rolled at four different rolling methods: asynchronous rolling, multi-directional asynchronous rolling, high temperature asynchronous rolling and high temperature multi-directional asynchronous rolling. The microstructure, mechanical properties and texture characteristics were comprehensively analyzed through optical microscope, MTS E43 universal testing machine and X-ray diffraction, respectively. The effects of temperature and rolling direction on microstructure and mechanical properties of magnesium-lithium alloy were discussed. The results show that α-Mg phase is largely elongated along the rolling direction and becomes thinner along the normal direction. The lowest thickness of the α-Mg phase is 2.6 μm rolled by high temperature multi-directional asynchronous rolling. Multi-directional asynchronous rolling samples have the best mechanical properties as its yield strength, ultimate tensile strength, elongation are 149 MPa and 167 MPa, 14.5%, respectively.The double peaks texture is tilt along the normal direction with an angle of 45° by multi-directional rolling, while the RD tilt angle of double peaks texture decreases due to the high temperature rolling. The intensity of R-cube texture is the strongest after rolling. β-Li rolling texture is transformed into {001}〈100〉 texture by high temperature multi-directional asynchronous rolling, which is beneficial to the multi-slip of {011}〈1${\rm{\bar 1}}$1〉 slip system.

Key words： magnesium-lithium alloy asynchronous rolling multi-directional asynchronous rolling high temperature asynchronous rolling high temperature multi-directional asynchronous rolling texture

收稿日期: 2021-12-14 出版日期: 2022-11-17

中图分类号:

TG146.2⁺2

基金资助:重庆市科委面上项目(cstc2019jcyj-msxmX0111)

通讯作者: 郭非 E-mail: guofei@cqut.edu.cn

作者简介: 郭非(1989—), 男, 副教授, 博士, 研究方向: 金属材料设计, 联系地址: 重庆市巴南区红光大道69号重庆理工大学花溪校区第三实验楼B311(400054), E-mail: guofei@cqut.edu.cn

引用本文:

王格格, 李晓燕, 郭非, 张紫璇, 陈翠玉, 朱召渲, 胡怡. 高温多向异步轧制对LZ91镁锂合金组织和力学性能的影响[J]. 材料工程, 2022, 50(11): 92-100.
Gege WANG, Xiaoyan LI, Fei GUO, Zixuan ZHANG, Cuiyu CHEN, Zhaoxuan ZHU, Yi HU. Effect of high temperature multidirectional asynchronous rolling on microstructure and mechanical properties of LZ91 magnesium-lithium alloy. Journal of Materials Engineering, 2022, 50(11): 92-100.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2021.001196 或 http://jme.biam.ac.cn/CN/Y2022/V50/I11/92

Fig.1 轧机与轧制路径示意图
(a)轧机；(b)异步轧制；(c)多向异步轧制

Fig.2 不同轧制方式下LZ91镁锂合金RD-TD面中间层的显微组织
(a)未轧制；(b)AR；(c)MAR；(d)HAR；(e)HMAR

Fig.3 不同轧制方式下LZ91镁锂合金ND-RD面中间层的显微组织
(a)未轧制；(b)AR；(c)MAR；(d)HAR；(e)HMAR

Fig.4 不同轧制方式下镁锂合金ND-RD面α相厚度

Fig.5 不同方式轧制后镁锂合金应力-应变曲线

Table 1 镁锂合金的力学性能

Fig.6 LZ91镁锂合金中间层α-Mg相(0001)面和(10${\rm{\bar 1}}$0)面的极图
(a)AR；(b)MAR；(c)HAR；(d)HMAR

Fig.7 不同轧制方式下LZ91镁锂合金中间层β-Li相的ODF图
(a)AR；(b)MAR；(c)HAR；(d)HMAR；(e)体心立方结构金属φ₂=45°的理想织构示意图^[27]；(f)，(g)在α丝织构和γ丝织构中排列的β-Li相织构强度演变

Table 2 α-Mg相基面和锥面〈c+a〉滑移的SF值

Fig.8 LZ91镁锂合金中间层β-Li相λ织构取向分布

Table 3 β-Li相{011}〈1${\rm{\bar 1}}$1〉滑移系的SF值

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