Wu Xiaofeng, Xu Chunxiang, Kuan Jun, Zhang Zhengwei, Zhang Jingshan, Yang Wenfu
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
Materials (Basel). 2020 Mar 5;13(5):1147. doi: 10.3390/ma13051147.
The previous study conducted on the as-cast Mg-2Y-1Zn-0.6Zr alloy showed that the tensile strength, yield strength and elongation of the as-cast alloy were 245 MPa, 135 MPa and 14.4%, respectively. In order to further explore the potential of the material, the hot extrusion process of variable temperature (250 °C, 300 °C and 350 °C) was carried out on the basis of the as-cast alloy. After hot extrusion, the mechanical properties of the material have been greatly improved compared with as-cast alloy. The tensile strength, yield strength and elongation of the extruded alloy reached 327 MPa, 322 MPa and 24.9%, respectively. The reason for the significant improvement of material properties is mainly due to the dynamic recrystallization during thermal processing, which greatly fines the grains of as-cast alloy. Moreover, the experimental results shown that the corrosion performance of the alloy after hot extrusion at 300 °C is also optimal.
先前对铸态Mg-2Y-1Zn-0.6Zr合金进行的研究表明，铸态合金的抗拉强度、屈服强度和伸长率分别为245MPa、135MPa和14.4%。为了进一步探索该材料的潜力，在铸态合金的基础上进行了变温（250℃、300℃和350℃）热挤压工艺。热挤压后，材料的力学性能与铸态合金相比有了很大提高。挤压合金的抗拉强度、屈服强度和伸长率分别达到327MPa、322MPa和24.9%。材料性能显著提高的原因主要是热加工过程中的动态再结晶，这大大细化了铸态合金的晶粒。此外，实验结果表明，300℃热挤压后合金的耐腐蚀性能也是最佳的。
