Yu Zemin, Hu Wenxin, Chen Zhiqiang, Shi Lei, Yang Lei, Jin Jianfeng, Zhang Erlin
State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou Research Institute of Rare Earths, Baotou 014030, China.
Key Laboratory for Anisotropy and Texture of Materials, Education Ministry of China, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China.
Materials (Basel). 2024 Aug 28;17(17):4263. doi: 10.3390/ma17174263.
The effect of the extrusion process on the microstructure, corrosion, and mechanical properties of Mg-Zn-Ca-Zr alloy has been investigated. Zn and Ca were both in a solid solution and only the Zr-rich phase was observed in the homogenized and extruded alloys. The Zr-rich phase was obviously refined after extrusion. The corrosion rate of the homogenized alloy decreased by about 25% after extrusion. This is because the refined Zr-rich phase was easier to cover with the deposited corrosion products, which reduced the cathodic reaction activity of the Zr-rich phase. The corrosion rate is similar for the alloys extruded at 320 °C and 350 °C since the size and distribution of the Zr-rich phase were not different in the two conditions. The alloy extruded at 320 °C has a smaller grain size and better comprehensive mechanical properties.
研究了挤压工艺对Mg-Zn-Ca-Zr合金微观结构、耐腐蚀性和力学性能的影响。Zn和Ca均处于固溶体中，在均匀化和挤压后的合金中仅观察到富Zr相。挤压后富Zr相明显细化。均匀化合金挤压后的腐蚀速率降低了约25%。这是因为细化的富Zr相更容易被沉积的腐蚀产物覆盖，从而降低了富Zr相的阴极反应活性。在320℃和350℃挤压的合金腐蚀速率相似，因为在这两种条件下富Zr相的尺寸和分布没有差异。在320℃挤压的合金具有更小的晶粒尺寸和更好的综合力学性能。
