Improved mechanical properties and strengthening mechanism with the altered precipitate orientation in magnesium alloys
Improved mechanical properties and strengthening mechanism with the altered precipitate orientation in magnesium alloys
复制标题
通过改变镁合金中的析出物取向来改善机械性能和强化机制
DOI：
10.1016/j.jma.2020.09.028
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发表时间：
2021-02
影响因子：
17.6
通讯作者：
X.Y. Qian Q. Zeng K.X. Sun G.F. Quan
中科院分区：
文献类型：
--
作者：
Y.J. Wan;Y. Zeng;Y.C. Dou;D.C. Hu;X.Y. Qian Q. Zeng K.X. Sun G.F. Quan
提出了先时效后孪生变形的方法，以改变AZ 31镁合金中β-Mg 17 Al 12析出相的取向，使其由（0002）α基面（称为基面）转变为{101 <$0} α棱柱面（称为棱柱面）。实验结果表明，与含基板的试件相比，含棱柱板试件的压缩屈服强度提高了40 MPa，压缩比提高了22%。通过屈服强度（YS）模型与晶粒尺寸，沉淀特征（尺寸，取向，分数）和施密德因子（SF）的函数分析了潜在的强化机制。结果表明，孪晶变形改变了析出相的取向，细化了晶粒尺寸，是提高合金抗压强度的主要原因。特别是在相同的析出物直径和SF值下，棱柱板对基面滑移的强化作用总是强于基体板。此外，镁合金中柱状晶滑移与基面滑移的CRSS比值减小，表明镁合金中非基面滑移的活性增强。更多的激活滑移系统提供更多的移动的位错，有助于镁轧制板与棱柱板的大压缩比。
Aging prior to twinning deformation was proposed to alter the precipitate orientation of the plate-shaped β-Mg 17 Al 12 from (0002) α basal planes (named basal plates) to {10 1¯ 0} α prismatic planes (named prismatic plates) in AZ31 Mg alloy. The experimental results showed that the compressive yield strength (CYS) of the sample containing prismatic plates increased 40 MPa and the compression ratio raised by 22% compared to that containing basal plates. The underlying strengthening mechanism was analyzed via a yield strengthen (YS) model with a function of grain size, precipitate characters (size, oritention, fraction) and Schmid factor (SF). It revealed that the improvement of CYS was mainly attributed to the altered precipitate orientation and refined grain size produced by twinning deformation. Particularly, the prismatic plates always have a stronger hardening effect on basal slip than basal plates under the same varites of precipitate diameter and SF. Besides, the decreased CRSS ratio of prismatic slip to basal slip revealed that the activity of non-basal slip in Mg alloy might be enhanced. More activated slip systems provided more mobile dislocations, contributing to the large compression ratio of the Mg rolled sheet with prismatic plates.
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DOI：
10.12989/amr.2012.1.3.169
发表时间：
2008-08
期刊：
Advances in materials research
影响因子：
--
作者：
T. Srivatsan;K. Manigandan;C. Godbole;M. Paramsothy;M. Gupta
通讯作者：
T. Srivatsan;K. Manigandan;C. Godbole;M. Paramsothy;M. Gupta
DOI：
10.1016/j.msea.2016.12.123
发表时间：
2017-02
影响因子：
6.4
作者：
H. Qiao;Xiaoqian Guo;A. Oppedal;H. Kadiri;Peidong Wu;S. Agnew
通讯作者：
H. Qiao;Xiaoqian Guo;A. Oppedal;H. Kadiri;Peidong Wu;S. Agnew
影响因子：
9.8
作者：
Haidong Fan;A H W Ngan;Kefu Gan;Jaafar A El-Awady
通讯作者：
Jaafar A El-Awady
稀土元素Gd和Y对镁合金固溶强化的影响
影响因子：
6.2
作者：
Gao, L.;Chen, R. S.;Han, E. H.
通讯作者：
Han, E. H.
影响因子：
9.4
作者：
Liu, H.;Lin, F. X.;Nie, J. F.
通讯作者：
Nie, J. F.