稀土Ce对半固态挤压铸造AlSi10Cu3Fe合金组织及性能影响  

Effect of Rare Earth Ce on Microstructure and Properties of Semi-Solid Squeeze Casting AlSi10Cu3Fe Alloy

作　　者：马路路 张南洋 张波 张书维 MA Lu-lu;ZHANG Nan-yang;ZHANG Bo;ZHANG Shu-wei(School of Intelligent Manufacturing and Emergency Equipment,Jiangsu College of Safety Technology,Xuzhou 221000,Jiangsu,China)

机构地区：[1]江苏安全技术职业学院,智能制造与应急装备学院,江苏徐州221000

出　　处：《铸造》2024年第8期1137-1143,共7页Foundry

基　　金：江苏省高等学校自然科学重点研究项目资助(14589202301)。

摘　　要：通过光学显微镜、X射线衍射仪、扫描电子显微镜、电子万能试验机、显微硬度计及导电仪等手段分析了稀土Ce元素对半固态挤压铸造AlSi10Cu3Fe合金组织及性能演变的影响。研究结果表明:稀土Ce元素对半固态挤压铸造合金组织具有很好地细化作用,稀土添加量为0.5%时半固态合金组织细化效果最好,初生α-Al相呈现出等轴晶或球状晶形态,排列有序且分布非常均匀,合金的平均晶粒尺寸和晶粒形状因子分别为48μm与0.75,与不含稀土Ce的合金相比晶粒尺寸降低了51.51%,形状因子提高了53.06%。与此同时,半固态合金的力学性能也达到峰值,其抗拉强度、伸长率及显微硬度分别为231.98 MPa、7.8%和HV100.15,与不含稀土的合金相比,分别提高了37.81%、59.18%和25.38%。不含稀土Ce及稀土Ce含量为0.5%的合金导电率分别为38.56%IACS和43.27%IACS,稀土Ce的添加也有助于合金导电性能的提高。The effects of rare earth Ce on the microstructure and properties of semi-solid squeeze cast AlSi10Cu3Fe alloy were analyzed by means of optical microscope,X-ray diffractometer,scanning electron microscope,electronic universal testing machine,microhardness tester and conductivity meter.The results showed that the rare earth Ce had an excellent refining effect on the microstructure of the semi-solid squeeze cast alloy,when the rare earth addition was 0.5%,the microstructure refining effect of the semi-solid alloy was the best,the primaryα-Al phase presented an equiaxed or spherical crystal morphology,and the distribution was very uniform and orderly.The average grain size and grain shape factor of the alloy were 48μm and 0.75,respectively.The grain size was reduced by 51.51%and the shape factor was increased by 53.06%compared with those of the alloy without Ce.At the same time,the mechanical properties of the semi-solid alloy also reached the peak,and its tensile strength,elongation and microhardness were 231.98 MPa,7.8%and HV 100.15,respectively,which were increased by 37.81%,59.18%and 25.38%compared with the alloys without rare earth.The electrical conductivity of alloys without rare earth Ce and 0.5%rare earth Ce was 38.56%IACS and 43.27%IACS,respectively.The addition of the rare earth Ce also contributed to the improvement of the electrical conductivity of the alloys.

关 键 词：AlSi10Cu3Fe合金 半固态 稀土Ce 微观组织 力学性能 导电率 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG249.26[金属学及工艺—金属材料]