摘要
在不同的强脉冲峰值电流作用下制备Cu-20Pb亚偏晶合金,分析合金的显微组织和物相组成,研究合金的显微硬度和耐磨性能。结果表明,Cu-20Pb亚偏晶合金由基体α-Cu和基体α-Cu之间的Pb相组成。脉冲峰值电流为0时,合金枝晶稀疏,晶粒较大,基体上存在偏析组织;峰值电流为1 500A时,合金的晶粒细小,组织均匀性好,合金的平均显微硬度(HV0.49)最大,为58.04,与0时的合金相比提高了28.58%;脉冲峰值电流在0～1 500A时,随着脉冲峰值电流的增大晶粒细化,平均显微硬度随着脉冲峰值电流的增加而增大;峰值电流由1 500A增到2 000A时,晶粒变大,平均显微硬度降低。摩擦试验结果表明,脉冲峰值电流在1 500A时合金摩擦性能最佳。
Cu-20Pb hypomonotectic alloys were prepared under different strong pulse currents,and the structure and phase composition,microhardness and anti-friction properties of hypomonotectic alloy were analyzed.The results reveal that Cu-20Pb hypomonotectic alloys are mainly composed of matrix α- Cu and Pb phase in matrix α-Cu.When the pulse peak current is 0,the hypomonotectic alloys'dendrite is sparse with large crystal grain size and less uniformity,while the peak current is 1500A,the grain size of the alloy reaches the smallest with good uniformity,meanwhile,average hardness reaches 58.04 HV0.49,increased by 28.58% compared with that of ones with 0 peak current.When the peak current is in the range of 0~1500A,with increasing in current,the grain size is decreased while average hardness is increased.However,with peak current increased from 1500A to 2000A,grain size is increased while hardness is decreased.Friction and wear experiments reveal that the hypomonotectic alloy presents a satisfied friction performance with the pulse peak current of 1500A.
作者
余挺
张磊
王东新
秦春
耿桂宏
Yu Ting;Zhang Lei;Wang Dongxin;Qin Chun;Geng Guihong(College of Materials Science and Engineering,North Minzu University;State Key Laboratory of Special Rare Metal Materials,Northwest Rare Metal Materials Research Institute Ningxia Co.,Ltd.)
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2018年第12期1389-1392,共4页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51561001)
北方民族大学研究生创新试验课题资助项目(YCX18091)
关键词
强脉冲电流
Cu-20Pb亚偏晶合金
显微组织
显微硬度
摩擦性能
Strong Pulse Current Field
Cu-20Pb Hypomonotectic Alloy
Microstructure
Microhardness
Anti-friction Performance
