Effects of Strong Pulse Current on Microstructure and Properties of Cu-20Pb Hypomonotectic Alloy

Yu Ting; Zhang Lei; Wang Dongxin; Qin Chun; Geng Guihong

doi:10.15980/j.tzzz.2018.12.030

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Effects of Strong Pulse Current on Microstructure and Properties of Cu-20Pb Hypomonotectic Alloy
Vol. 38, Issue 12, Pages: 1389-1392(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.12.030

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[1]余挺,张磊,王东新,秦春,耿桂宏.强脉冲电流对Cu-20Pb亚偏晶合金组织和性能的影响[J].特种铸造及有色合金,2018,38(12):1389-1392.

Yu Ting, Zhang Lei, Wang Dongxin, et al. Effects of Strong Pulse Current on Microstructure and Properties of Cu-20Pb Hypomonotectic Alloy. [J]. Special Casting & Nonferrous Alloys 38(12):1389-1392(2018)
[1]余挺,张磊,王东新,秦春,耿桂宏.强脉冲电流对Cu-20Pb亚偏晶合金组织和性能的影响[J].特种铸造及有色合金,2018,38(12):1389-1392. DOI： 10.15980/j.tzzz.2018.12.030.

Yu Ting, Zhang Lei, Wang Dongxin, et al. Effects of Strong Pulse Current on Microstructure and Properties of Cu-20Pb Hypomonotectic Alloy. [J]. Special Casting & Nonferrous Alloys 38(12):1389-1392(2018) DOI： 10.15980/j.tzzz.2018.12.030.

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。

Abstract

Cu-20 Pb 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-20 Pb hypomonotectic alloys are mainly composed of matrixα-Cu and Pb phase in matrixα-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 1 500 A

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 0～1 500 A

with increasing in current

the grain size is decreased while average hardness is increased.However

with peak current increased from 1 500 Ato 2 000 A

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 1 500 A.