摘要
高镍含量的Cu-Ni-Al合金由于具有优异的高温耐磨特性,可应用于航空、航天等领域中,制造具有耐腐蚀、高温耐磨、高导热性能的关键零部件。本工作采用离心铸造工艺制备了一种复杂合金化的高温耐磨铜合金。重点分析了不同铸造工艺参数对铸件组织特征和力学性能的影响。同时与常用耐磨铝青铜合金QAl10-4-4的性能进行了比较。结果表明:浇注温度显著影响铸件横截面上的等轴晶比例,为了使铸件获得全部的等轴晶,浇注温度必须控制在1250℃左右。在最佳工艺参数下,合金的室温抗拉强度为810MPa,500℃下的高温抗拉强度为435MPa,分别比QAl10-4-4合金提高了14%和110%。
The high Ni content Cu-Ni-Al-based alloys can be used widely in aviation and spaceflight fields due to their excellent wear resistance at elevated temperature.A wear-resistant copper-based alloy was prepared by centrifugal casting.The effect of casting parameters on microstructure and mechanical property of the ingot was studied.The property of the alloy was compared with that of conventional QAl10-4-4 aluminum bronze.The results show that the fraction of equiaxed grain in the transverse section of the ingot was strongly determined by the pouring temperature.In order to obtain the all equiaxed grain,the pouring temperature should be confined near 1250℃.The tensile strength of the alloy at room temperature and 500℃ is 810MPa and 435MPa,respectively,in optimal centrifugal casting processing,which are 14% and 110% higher than that of QAl10-4-4 alloy.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2009年第S1期146-149,153,共5页
Journal of Materials Engineering
关键词
耐热铜合金
离心铸造
组织
性能
heat resistant copper-based alloy
centrifugal casting
microstructure
property
