纳米CeO2/Zn-4.5Al-RE复合材料的力学性能及表观粘度
Mechanical Properties and Apparent Viscosity of Nano-CeO2/Zn-4.5Al-RE Composites
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摘要: 测试了不同增强颗粒质量分数的纳米CeO2/Zn-4.5Al-RE复合材料的力学性能,测定了柱形试样熔化前后的高度变化率,讨论了复合材料的表观粘度,并研究了纳米CeO2含量对两者的影响规律.结果表明:CeO2的加入提高了基体的力学性能,当其含量为3%时,复合材料的维氏硬度、弹性模量和抗拉强度分别达到96.7 HV,17.1 GPa和176.5 MPa,较基体分别提高了41.2%,34.6%和34.2%,而伸长率则降低了4.6%;随着CeO2含量的增加,复合材料的高度变化率ΔH/H0大大降低,粘度急剧增大.Abstract: The mechanical properties of nano-CeO2/Zn-4.5Al-RE composites with different weight fractions of CeO2 were measured with a universal tester.And the apparent viscosity was investigated by means of the height decreasing rate of composite before and after remelting.The effects of nano-CeO2 on mechanical properties and apparent viscosity were analyzed.The mechanical properties of matrix increase with the addition of CeO2.Compared with matrix alloy,the mechanical properties of composites are optimal at the CeO2 weight fraction of 3%.With the values of the HV hardness,modulus and tensile strength being 96.7 HV,17.1 GPa and 176.5 MPa,increased by 412%,34.6% and 34.2% respectively.However,the elongation ratio of composites decreasesed by 4.6%.The apparent viscosity of composites rapidly increases with increasing content of CeO2.
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