Study on micro-structure, solid solubility and tensile properties of 5A90 Al-Li alloy cast by low-frequency electromagnetic casting processing
Study on micro-structure, solid solubility and tensile properties of 5A90 Al-Li alloy cast by low-frequency electromagnetic casting processing
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低频电磁铸造5A90铝锂合金显微组织、固溶度及拉伸性能研究
DOI：
10.1016/j.jallcom.2019.153318
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发表时间：
2020
影响因子：
6.2
通讯作者：
Cui Jianzhong
中科院分区：
文献类型：
--
作者：
Wang Fuyue;Wang Ning;Yu Fang;Wang Xiangjie;Cui Jianzhong
介绍了一种高效无污染铸造技术--低频电磁铸造（LFEC）技术，并研究了其对5A 90铝锂合金组织和力学性能的影响。合金的力学性能与铸造冶金质量和析出相有密切关系。与常规直接激冷铸造（DCC）相比，LFEC能促进δ′（Al 3Li）/β′（Al 3 Zr）相的析出，减小PFZ宽度，增强了析出强化效果，缓解了应变局部化。同时，低频电磁场的应用改变了液池的流场和温度场，显著细化了铸锭的组织，提高了铸锭的冶金质量。在150 A/15 Hz下进行LFEC铸造，时效态合金的最大屈服强度和极限抗拉强度分别达到371.85 MPa和495.5 MPa，伸长率保持在9.82%。
In this paper, the low-frequency electromagnetic casting (LFEC) processing was introduced as an efficient pollution-free casting technique, and how it influenced the micro-structure and mechanical properties of 5A90 Al–Li alloy was investigated. The mechanical properties of the alloy had a close connection with the casting metallurgical quality and the precipitation phases. Compared to the conventional direct chill casting (DCC), the LFEC could promote the precipitate of the δ′ (Al3Li)/β′ (Al3Zr) and reduce the width of PFZ, which enhanced the effect of the precipitation strengthen and alleviated the strain localization. Meanwhile, the micro-structure of the ingot was refined significantly and the metallurgical quality was improved after LFEC treatment due to the modification of the flow and temperature field of the sump that caused by the application of low-frequency electromagnetic field. Maximum yield strength and ultimate tensile strength of as-aged alloy cast by LFEC with 150 A/15 Hz could reach 371.85 MPa and 495.5 MPa, while elongation remained at 9.82%.