Hot Compression Behavior and Workability of Mg-5Gd-3Y-2Zn-0.5Zr Alloy with Long-Period Stacking Ordered Phases
Hot Compression Behavior and Workability of Mg-5Gd-3Y-2Zn-0.5Zr Alloy with Long-Period Stacking Ordered Phases
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DOI：
10.1007/s11665-022-07256-8
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发表时间：
2022-08
影响因子：
2.3
通讯作者：
Xiaodong Yang;Baolong Liu;Xiaojie Zhou;Weiying Huang;Liwei Lu;Xian-zheng Lu;Yaru Liu
中科院分区：
文献类型：
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作者：
Xiaodong Yang;Baolong Liu;Xiaojie Zhou;Weiying Huang;Liwei Lu;Xian-zheng Lu;Yaru Liu
研究了含有长周期堆垛有序相（LPSO）的Mg-5Gd-3 Y-2 Zn-0. 5 Zr（2#）合金的压缩行为和加工性能，并与Mg-5Gd-3 Y-1 Zn-0. 5 Zr（1#）合金的压缩行为和加工性能进行了比较。结果表明，Zn含量的增加可导致枝晶间LPSO相体积分数的增加和热稳定晶内片层LPSO相的形成。均匀化处理后出现片层状LPSO相，在压缩过程中保持不溶解状态，强烈抑制动态再结晶。2#合金的加工性能较差，表现为变形激活能（Q）较大（约336 kJ/mol）、动态再结晶率较低、加工不当区域较宽、宏观裂纹频率较高。此外，由于2#合金的枝晶间和晶内LPSO相增加的综合作用，Zn含量的增加导致更高的晶粒尺寸指数（m，~ 5.4）。本工作旨在为含LPSO相镁合金的工业生产提供有用的信息。
The compression behavior and workability of the Mg-5Gd-3Y-2Zn-0.5Zr (designated as 2#) alloy with long-period stacking ordered (LPSO) phases were investigated and compared with those of the Mg-5Gd-3Y-1Zn-0.5Zr (designated as 1#) one. The results reveal that the increased volume fraction of interdendritic LPSO phases and the formation of thermostable intragranular lamellar LPSO phases can be induced by the increase in Zn content. The lamellar LPSO phases appear after homogenization and keep undissolved during compression, which strongly inhibit the dynamic recrystallization. The 2# alloy exhibits the deteriorated workability which is embodied in the larger deformation activation energy (Q, ~ 336 kJ/mol), lower DRX ratios, broader improper processing domains, and higher frequency of macrocracks. Moreover, the increased Zn content leads to the higher grain size exponent (m, ~ 5.4) due to the combined effects of increased interdendritic and intragranular LPSO phases for the 2# alloy. This work aims to provide useful information for the industrial production of Mg alloys which contain LPSO phases.