不同挤压工艺对Mg-15Gd合金显微组织和耐腐蚀性能的影响  

Effect of Different Extrusion Processes on the Microstructure and Corrosion Resistance of Mg-15 Gd Alloy

作　　者：何志琴 HE Zhiqin(Yancheng Vocational College of Agricultural Science and Technology,Yancheng 224001,China)

机构地区：[1]盐城农业科技职业学院,江苏盐城224001

出　　处：《河南科技》2025年第1期78-82,共5页Henan Science and Technology

摘　　要：【目的】Mg-Gd系合金在室温及高温条件下都表现出了良好的力学性能,但相对较差的耐蚀性限制了其在航天构件、导弹外壳和发动机引擎盖等方面的应用。因此,研究如何改善其耐腐蚀性具有重要意义。【方法】运用不同挤压工艺对Mg-15Gd进行处理,采用失重、电化学等试验研究其耐腐蚀性能。利用OM与SEM对合金组织、腐蚀产物和腐蚀形貌进行观察,并使用XRD对其进行物相分析。【结果】经固溶处理后,合金晶粒长大,第二相Mg_(5)Gd基本溶入α-Mg基体中,含量减少。对其挤压后合金晶粒细化,第二相Mg_(5)Gd在晶界上少量析出,呈颗粒状散落分布于α-Mg基体上。【结论】固溶和挤压处理显著提高了铸态Mg-15Gd合金的耐腐蚀性。各合金的耐腐蚀性由强到弱的排序为:挤压态>固溶态>铸态。[Purposes]Mg-Gd alloys exhibit good mechanical properties at room temperature and high temperature,but their relatively poor corrosion resistance limits their application in aerospace components,missile shells and engine hoods.Therefore,it is of great significance to study how to improve its corrosion resistance.[Methods]Mg-15Gd was treated with different extrusion processes,and weight loss and electrochemical tests were used to study its corrosion properties.The alloy tissue,corrosion products and corrosion morphology were observed using OM and SEM and the phase analysis was conducted.[Findings]After solid solution treatment,the alloy grains were grown,and the second phase Mg_(5)Gd was basically dissolved into the α-Mg matrix,and the content was decreased.After extrusion,the alloy grains were refined,and the second phase Mg_(5)Gd precipitated a small amount at the grain boundary and scattered on the α-Mg matrix.[Conclusions]Solid solution and extrusion treatment significantly improve the corrosion resistance of cast Mg-15Gd alloy,and the corrosion resistance of each alloy is as follows:extrusion state>solid solution state>cast state.

关 键 词：Mg-15Gd 挤压工艺 显微组织 耐腐蚀性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]