挤压工艺对AZ80NC可溶镁合金组织和性能的影响  

Effect of extrusion process on microstructure and properties of AZ80NC degradable magnesium alloy

作　　者：周晓舟 孟利[1] 徐江杰 张宁[1] 涂杨 傅超 杨勇[1] Zhou Xiaozhou;Meng Li;Xu Jiangjie;Zhang Ning;Tu Yang;Fu Chao;Yang Yong(Metallurgical Technology Institute,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司冶金工艺研究所,北京100081

出　　处：《金属热处理》2025年第3期38-43,共6页Heat Treatment of Metals

基　　金：钢铁研究总院有限公司自主投入研发专项基金(事23160400Z)。

摘　　要：研究了挤压温度和挤压速度对AZ80NC可溶镁合金微观组织、力学性能和溶解性能的影响。结果表明,铸态AZ80NC合金组织由α-Mg基体和β-Mg_(17) Al_(12)、MgAlNi、MgAlCu第二相组成。在300℃以上热挤压时,AZ80NC合金挤压棒材发生了完全动态再结晶,其显微组织为等轴晶粒;在低温和低挤压速度挤压时,AZ80NC合金挤压棒材边部发生不完全再结晶,形成双峰晶粒组织。随着挤压温度和挤压速度的降低,AZ80NC合金屈服强度、抗拉强度逐渐升高,伸长率、腐蚀速率逐渐降低。但在低温和低应变速度挤压时形成双峰晶粒组织后,合金同时具有高的强度和塑性,合金的腐蚀速率也较大,最大可达31.18 mg/(cm^(2)·h)。Effects of extrusion temperature and speed on microstructure,mechanical properties and dissolution properties of the AZ80NC degradable magnesium alloy were investigated.The results show that the as-cast microstructure of the AZ80NC alloy consists ofα-Mg matrix and secondary phases includingβ-Mg_(17) Al_(12),MgAlNi and MgAlCu.During hot extrusion at temperatures above 300℃,complete dynamic recrystallization occurs in the extruded rods of the AZ80NC alloy,resulting in an equiaxed grain microstructure.Under low temperature and low strain rate extrusion,partial recrystallization occurs at the edges of the extruded rods,forming a bimodal grain microstructure.As the extrusion temperature and extrusion rate decrease,the yield strength and tensile strength of the AZ80NC alloy gradually increase,while the elongation and corrosion rate decrease.However,when a bimodal grain microstructure is formed under low temperature and low strain rate extrusion,the alloy exhibits both high strength and high ductility,with higher corrosion rate reaching a maximum of 31.18 mg/(cm^(2)·h).

关 键 词：可溶镁合金 挤压工艺 力学性能 溶解性能 

分 类 号：TG376.2[金属学及工艺—金属压力加工] TG146.2[一般工业技术—材料科学与工程]