Ce和La对Al-Zn合金微观组织和力学性能的影响  

Effect of Ce and La on Microstructure and Mechanical Properties of Al-Zn Alloy

作　　者：李培跃 张明辉 孙文韬 鲍志豪 高琦 王延枝 牛龙 LI Peiyue;ZHANG Minghui;SUN Wentao;BAO Zhihao;GAO Qi;WANG Yanzhi;NIU Long(Luoyang Ship Materials Research Institute,Luoyang 471023,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]中国船舶集团有限公司第七二五研究所,洛阳471023 [2]东北大学材料科学与工程学院,沈阳110819

出　　处：《材料研究学报》2024年第9期651-658,共8页Chinese Journal of Materials Research

摘　　要：使用金相(OM)和扫描电镜(SEM)观测、XRD谱、硬度和耐磨性测试等手段,研究了混合稀土元素Ce和La对Al-Zn合金的微观组织和力学性能的影响。结果表明:在Al-Zn合金中加入稀土元素Ce和La,使合金微观组织中沿晶界生成Al11Ce3相和Al11La3相,在合金基体内分布点状富铁相,稀土含量为0.75%时生成棒状初生Al11Ce3相。随着混合稀土含量的提高Al-Zn合金的晶粒逐渐细化,稀土含量为0.75%的合金晶粒尺寸最小,约为151μm。随着混合稀土含量的提高合金的硬度和耐磨性随之提高,稀土含量为0.75%的合金硬度最高(约为27.5HV);耐磨性最好,平均摩擦因数为1.076,平均磨损率为36.5 mg·N^(-1)·m^(-1)。在Al-Zn合金的摩擦磨损过程中,发生磨料磨损、剥层磨损和塑性变形。The effect of mixed rare earth elements Ce and La on the microstructure and mechanical properties of Al-Zn alloy was studied by means of metallographic(OM),scanning electron microscopy(SEM),X-ray diffractometer(XRD),hardness tester and wear resistance test.The results show that after the addition of Ce and La,the Al-Zn alloy presents microstructure composed of three phases:eutectic Al11Ce3 and Al11La3 phases distributed along the grain boundaries and punctate iron-rich phases distributed in the matrix,furthermore,a rod-shaped primary Al11Ce3 phase may emerge when 0.75%RE is added.With the increase of mixed rare earth content,the grain of Al-Zn alloy is gradually refined,while the grain size is the smallest when the rare earth content is 0.75%,which is about 151μm.The smaller the grain size,the higher the hardness and wear resistance of the alloy.Among others,the hardness is the highest,about 27.5HV,and the wear resistance is also the highest,the average friction factor is 1.076,and the average wear rate is 36.5 mg·N^(-1)·m^(-1) for the alloy with addition of 0.75% mixed RE.In the process of friction wear,abrasive wear,peeling wear and plastic deformation mainly occur for the Al-Zn alloys.

关 键 词：金属材料 AL-ZN合金 微合金化 微观组织 力学性能 磨损机理 

分 类 号：TG146.21[一般工业技术—材料科学与工程]