CALPHAD-guided design of Mg-Y-Al alloy with improved strength and ductility via regulating the LPSO phase
CALPHAD-guided design of Mg-Y-Al alloy with improved strength and ductility via regulating the LPSO phase
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DOI：
10.1016/j.actamat.2023.119521
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发表时间：
2023-11
期刊：
影响因子：
9.4
通讯作者：
Yiwen Chen;Jingya Wang;Weisen Zheng;Quan Li;Mingdi Yu;Tao Ying;Xiaoqin Zeng
中科院分区：
文献类型：
--
作者：
Yiwen Chen;Jingya Wang;Weisen Zheng;Quan Li;Mingdi Yu;Tao Ying;Xiaoqin Zeng
本工作采用CALPHAD指导的设计策略，利用LPSO相的强化作用和α-Mg基体的延性作用，开发出高强塑性的Mg-Y-Al合金。为了实现这一目标，通过计算等值线截面和相分数图，定量地优化了α-Mg基质中的LPSO相含量和Y含量。在此基础上，设计了三种典型的不含LPSO相和不同LPSO含量的Mg-Y-Al合金。LPSO相的引入和含量的增加显著提高了合金的强度。然而，随着LPSO含量的增加，合金的塑性保持不变。通过对强化和塑性机制的分析，发现LPSO相通过细化动态再结晶晶粒度，起到短纤维强化作用，并通过阻碍<；c+a>；位错的运动，起到位错强化的作用。Y含量较高的延性α-Mg相在变形过程中通过多次滑移可以有效地承受塑性应变，显著提高了材料的塑性。这一研究结果为开发一种有效的设计策略，通过定量优化α-Mg基质中的LPSO相和Y含量来生产高强塑性镁合金，以及设计满足未来工程需求的高性能镁合金。
This work performed a CALPHAD-guided design strategy to develop high strength-ductility Mg–Y–Al alloy by taking advantage of the strengthening effect of the LPSO phase and the ductilizing effect of the α-Mg matrix. To achieve this goal, the LPSO phase content and the Y content in the α-Mg matrix were quantitatively optimizedviacalculations of the isoplethal section and phase fraction diagrams. Based on this, three typical Mg-Y-Al alloys without the LPSO phase and with varying LPSO contents were designed. The strength of the alloys was significantly improved by the introduction of the LPSO phase and the increase in its content. However, the ductility of the alloy was maintained while increasing the LPSO content. Through analyzing the strengthening and ductilization mechanisms, it was revealed that the LPSO phase can strengthen the extruded alloys by refining the dynamic recrystallized grain size, exerting a short-fiber-like strengthening effect, and dislocations strengthening effect by hindering <c+a> dislocations movements. The ductile α-Mg phase with considerable Y content can effectively withstand plastic strain by operating multiple slips during the deformation, significantly improving the ductility of the material. The results of this study inspired the development of an effective design strategy to produce high strength-ductility Mg-Y-Al alloys by quantitatively optimizing the LPSO phase and Y contents in the α-Mg matrix, as well as to design high-performance Mg alloys for engineering demands in the future.