Effect of Trace Mg Addition on Precipitation Behavior and Properties of Cu-Cr Alloy

doi:10.11901/1005.3093.2018.596

Chinese Journal of Materials Research

2019, Vol. 33

Issue (7): 552-560 DOI: 10.11901/1005.3093.2018.596

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Effect of Trace Mg Addition on Precipitation Behavior and Properties of Cu-Cr Alloy

Shanjiang WU¹,Junfeng WANG¹,Shuwei ZHONG¹,Jianbo ZHANG²(

),Hang WANG²,Bin YANG^1,²(

)

1. School of Material Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2. Institute of Engineering Research, Jiangxi University of Science and Technology, Ganzhou 341000, China

Cite this article:

Shanjiang WU,Junfeng WANG,Shuwei ZHONG,Jianbo ZHANG,Hang WANG,Bin YANG. Effect of Trace Mg Addition on Precipitation Behavior and Properties of Cu-Cr Alloy. Chinese Journal of Materials Research, 2019, 33(7): 552-560.

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Abstract

Cu-Cr and Cu-Cr-Mg alloys were prepared by melting and casting process, then the effect of Mg addition on hardness, electrical properties and softening resistance of the alloys was assessed. The results show that after aging treatment, the hardness and softening temperature of the Cu-Cr-Mg alloy are higher than that of the Cu-Cr binary alloy, while the high electrical conductivity is maintained. The main strengthening mechanism of these two alloys is aging precipitation strengthening. The addition of Mg inhibits the growth and structural transformation of the nano-precipitates. The strengthening phase of the peak-aged Cu-Cr-Mg alloy still maintains a coherent interface with the matrix. The precipitate with the similar structure as Heulser phase is observed in the over-aging alloy. After post heat treatment of the peak-aged alloys, the size of the strengthening phase of Cu-Cr-Mg alloy is significantly smaller than that of the Cu-Cr alloy. Mg and Cr coexist in the precipitate at the early stage of aging, while in the later stage of aging, only Cr exists inside the precipitate. The theoretical estimation results show that Mg can significantly reduce the interfacial energy between Cu (fcc) and Cr (bcc), leading to segregation of Mg at the interface matrix/precipitate. This may be the main reason why Mg can refine the precipitates and improve the performance of the Cu-Cr alloy.

Key words: metallic materials Cu-Cr system alloy microstructure aging strengthening softening resistance

Received: 30 September 2018

ZTFLH:

TG146.1

Fund: National Key Research and Development Program of China(2016YFB0301400);National Natural Science Foundation of China(51461017);National Natural Science Foundation of China(51561008);Natural Science Foundation of Jiangxi Province(20171ACB21044)

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	Shanjiang WU
	Junfeng WANG
	Shuwei ZHONG
	Jianbo ZHANG
	Hang WANG
	Bin YANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.596 OR https://www.cjmr.org/EN/Y2019/V33/I7/552

Table 1 Composition for experimental alloys (mass fraction, %)

Fig.1 Effect of aging time on (a) hardness and (b) conductivity of Cu-Cr-(Mg) alloy

Fig.2 Temperature-hardness curve of peak-aged Cu-Cr-(Mg) alloys after carried out at different temperatures for 1 h

Fig.3 TEM images and SAED patterns of (a) Cu-0.37Cr and (b) Cu-0.34Cr-0.16Mg alloys, aged at 500°C for 0.5 h

Fig.4 TEM images and SAED patterns of (a) Cu-0.37Cr and (b) Cu-0.34Cr-0.16Mg alloys aged at 500℃ for 1 h

Fig.5 TEM images and SAED patterns of (a) Cu-0.37Cr and (b) Cu-0.34Cr-0.16Mg alloys aged at 500℃ for 4 h

Fig.6 TEM images and SAED patterns of peak-aged (a-b) Cu-0.37Cr and (c-d) Cu-0.34Cr-0.16Mg alloys after carried out at 600℃ for 1 h

Fig.7 HRTEM images of (a) Cu-0.37Cr and (b) Cu-0.34Cr-0.16Mg alloys after aging at 500℃ for 0.5 h (The positions of EDS analysis were indicated by white arrows)

Table 2 EDS results of Cu-Cr-(Mg) alloys after aging at 500℃ for 0.5 h (atomic fraction, %)

Fig.8 HRTEM images of (a) Cu-0.37Cr and (b) Cu-0.34Cr-0.16Mg alloys after aging at 500℃ for 1 h (The positions of EDS analysis were indicated by white arrows)

Table 3 EDS results of Cu-Cr-(Mg) alloys after aging at 500℃ for 1 h (atomic fraction, %)

Fig.9 HRTEM images of (a) Cu-0.37Cr and (b) Cu-0.34Cr-0.16Mg alloys after aging at 500℃ for 4 h (The positions of EDS analysis were indicated by white arrows)

Table 4 EDS results of Cu-Cr-(Mg) alloys after aging at 500℃ for 4 h (atomic fraction, %)

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