High strength extruded Mg–5Zn–2Nd–1.5Y–0.6Zr–0.4Ca alloy produced by electromagnetic casting
High strength extruded Mg–5Zn–2Nd–1.5Y–0.6Zr–0.4Ca alloy produced by electromagnetic casting
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DOI：
10.1016/j.matlet.2005.03.044
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发表时间：
2005-08
影响因子：
3
通讯作者：
Qiang Li;Qudong Wang;Haitao Zhou;Xiaoqin Zeng;Ya Zhang;W. Ding
中科院分区：
文献类型：
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作者：
Qiang Li;Qudong Wang;Haitao Zhou;Xiaoqin Zeng;Ya Zhang;W. Ding
对Mg-5 Zn-2Nd-1.5Y-0.6Zr-0.4Ca电磁铸造合金的铸态组织进行了详细的表征，发现晶界处存在W相（Mg3 RE 2 Zn 3）。合金经643 K热挤压（挤压比分别为38和22）和673 K均匀化16 h后，在热挤压过程中发生动态再结晶，晶粒尺寸细化到2-5 μm，室温强度达到357 MPa，这可部分归因于在热挤压过程中MgZn 2型Laves相的沉淀。
As-cast microstructures of Mg–5Zn–2Nd–1.5Y–0.6Zr–0.4Ca electromagnetic casting alloy were characterized in detail, revealing the presence of W-phase (Mg3RE2Zn3) at grain boundaries. After hot extrusion at 643 K with two extrusion ratios of 38 and 22 respectively followed homogenization at 673 K for 16 h, the alloy showed an ultrafine grain size of 2–5 μm due to dynamic recrystallization in the course of hot extrusion, and exhibited a high strength of 357 MPa at room temperature, which can partially be attributed to the MgZn2type Laves phase precipitating during hot extrusion.