【摘要】 采用扫描电镜、X射线衍射仪、电子万能试验机和电化学工作站等研究了490℃固溶处理不同时间(4、8和12 h)对铸态Mg-1.5Zn-0.3Zr-0.2Ca-2Nd合金显微组织、力学性能以及耐腐蚀性能的影响。结果表明：随着固溶处理时间的增加，合金中沿晶界分布的连续网状第二相逐渐溶入α-Mg基体，使得显微组织趋于均匀，平均晶粒尺寸也略有增大；当固溶时间达到8 h时，合金中第二相的体积分数由铸态的3.22%显著降低至1.21%,同时平均晶粒尺寸由81.91μm增大至95.65μm,此时合金表现出较为优异的力学性能和耐腐蚀性能，其抗拉强度、屈服强度、伸长率以及平均腐蚀速率分别为195 MPa、126 MPa、7.3%和0.81 mm/y。更多还原

【Abstract】 Effect of solution treatment at 490 ℃ for different time(4 h, 8 h, and 12 h) on microstructure, mechanical properties, and corrosion resistance of as cast Mg-1.5Zn-0.3Zr-0.2Ca-2Nd alloy was studied using scanning electron microscopy, X-ray diffraction, electronic universal testing machine, and electrochemical workstation. The results show that with the increase of solution treatment time, the continuous network like second phases distributed along the grain boundaries in the alloy gradually dissolve into the α-Mg matrix, leading to the microstructure more uniform and the average grain size slightly increases. When the solution treatment time reaches 8 h, the volume fraction of the second phases in the alloy significantly decreases from 3.22% in the as cast state to 1.21%, and the average grain size increases from 81.91 μm to 95.65 μm. At this condition, the alloy exhibits excellent mechanical and corrosion resistance properties, with tensile strength, yield strength, elongation, and average corrosion rate of 195 MPa, 126 MPa, 7.3%, and 0.81 mm/y, respectively.更多还原