摘要
采用扫描电子显微镜、X射线衍射、透射电子显微镜和激光热导仪等分析测试手段,研究了Mg对压铸Al-8Ce合金微观组织、力学性能和导热性能的影响。结果表明,合金主要由α-Al初生相和Al-Al11Ce3共晶相组成,Mg在合金中以固溶态存在,没有含Mg的第二相生成,且Mg元素的添加对合金金微观组织无明显影响。压铸Al-8Ce-xMg合金的屈服强度和抗拉强度随着合金中Mg含量的增加而增加,而合金的伸长率和热导率则随着合金中Mg含量的增加而降低。试验结果表明,压铸Al-8Ce-0.50Mg合金展现出更加优异的综合性能,其屈服强度为112.8 MPa,抗拉强度为225.0MPa,伸长率为10.3%,热导率为153.7 W/(m·K)。
The effects of Mg on the microstructure,mechanical properties and thermal conductivity of Al-8 Ce die casting alloy were studied by scanning electron microscopy,X-ray diffraction,transmission electron microscope and flash thermal conductivity meter.The results indicate that the alloy consists of primaryα-Al and AlAl11Ce3 eutectic phase,and Mg atoms exist in the solid-solution phase without any Mg-contained second phase detected and the addition of Mg barely has influence on the microstructure and phase constituents of the alloy.The yield strength and ultimate tensile strength of the alloy increase with the Mg content,whereas the elongation and thermal conductivity of the alloy decrease with the Mg content.The experiment results also reveal that the HPDC Al-8 Ce-0.50 Mg has more excellent comprehensive properties,with the yield strength,ultimate tensile strength elongation and thermal conductivity being 112.8 MPa,225.0 MPa,10.3%and 153.7 W/(m·K),re spectively.
作者
权北北
李德江
曾小勤
徐犟鹍
QUAN Bei-bei;LI De-jiang;ZENG Xiao-qin;XU Jiang-kun(National Engineering Research Center of Light Alloy Net Forming,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《铸造》
CAS
北大核心
2020年第7期727-731,共5页
Foundry
基金
国家重点研发计划项目(2016YFB0101704)。
